EP4069704A1

EP4069704A1 - Silirane compounds as stable silylene precursors and their use in the catalyst-free preparation of siloxanes

Info

Publication number: EP4069704A1
Application number: EP19816646.4A
Authority: EP
Inventors: Richard Weidner; Fabian Andreas David HERZ; Matthias Fabian NOBIS; Bernhard Rieger
Original assignee: Wacker Chemie AG
Current assignee: Wacker Chemie AG
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2022-10-12
Also published as: KR20220112277A; US20230057557A1; JP2023505497A; WO2021110265A1; CN114746429A

Abstract

The invention describes silirane-functionalized compounds that consist of a substrate to which at least two silirane groups of the formula (I) are covalently bonded, a mixture containing the silirane-functionalized compounds according to the invention, and a process for preparing siloxanes.

Description

Silirane compounds as stable silylene precursors and their use in the catalyst-free production of siloxanes

The invention describes silirane-functionalized compounds consisting of a substrate to which at least two

Si1irane groups of the formula (I) are covalently bonded, as well as a mixture containing the silirane-functionalized compounds according to the invention and a process for the preparation of siloxanes. The crosslinking occurs through the thermal activation of multifunctional siliranes, which represent a stable precursor for highly reactive silylene species. The network formation takes place here through the reaction of the silylenes with functionalized siloxanes or polysiloxanes, and enables the use of a wide range of common siloxane compounds.

State of the art and technical task

Silicones are of great interest because of their excellent chemical and physical properties and are therefore used in a variety of ways. In contrast to carbon-based plastics, the van der Waals forces between homopolymer chains in siloxanes are very weak. In the case of siloxane homopolymers, this leads to flow behavior and very poor properties, even with very large molecular weights. For this reason, siloxanes are crosslinked and thus obtain their rubber-elastic state.

Several processes are known for the crosslinking of siloxanes, a basic distinction is made between addition crosslinking, condensation crosslinking and radical crosslinking. In addition crosslinking, vinyl-functionalized siloxanes react with hydridosiloxanes without cleavage products in what is known as hydrosilylation (RTV-2 or HTV). The response requires the use of Precious metal catalysts (mostly platinum) that cannot be recovered. During condensation crosslinking, terminal silanol groups are reacted with other silicon functional groups (eg Si-O-CH3, Si-O-C2H5, Si-O-COCH3). During the reaction, small, volatile compounds such as acetic acid or alcohols are split off and therefore material shrinkage. Condensation-curing systems can be handled as one-component systems that are activated by contact with small amounts of water (RTV-1). A metal catalyst (e.g.

Tin-based) added to accelerate the crosslinking reaction. In radical crosslinking, organic peroxides are used, which decompose into radicals when heated (HTV). The reactive radicals crosslink e.g. vinyl methyl siloxanes.

While the high reactivity of the processes mentioned is caused by catalysts, the crosslinking method described here is based on the extraordinarily high reactivity of silylenes. Silylenes are charge-free divalent silicon compounds and thus the heavier homologues of the carbenes. Due to their diverse reactivity, silylene compounds are suitable for crosslinking a wide variety of monomers. For example, silylenes react with Si-H compounds in an insertion reaction that produces a disilane. The reaction with nucleophiles such as silanoias or alcohols also takes place through insertion into the OH bond. When a silylene is inserted into the Si-O bond of an alkoxysilane, a disilane is formed. Silylenes react with alkenes and alkynes via a cycloaddition to form silacyclopropanes (silirane) or silacyclopropenes (silirene).

Scheme 1: Reactivities of silylene compounds. Silylenes insert e.g. in Si-H, Si-OH and Si-OR compounds or react with double bonds in a cycloaddition

Several methods are known for the synthesis of silylenes.

The decomposition of polysilanes by UV light or heat produces, for example, highly reactive silylenes such as Me2Si: which are not stable and quickly dimerize. Since the production of the polysilanes is carried out under very harsh conditions, this synthesis method leaves little room for maneuver in the choice of the functional groups. More complex silylenes can be obtained by reducing dihalosilanes. Lithium or KC8, for example, can be used as reducing agents. There are known silylene compounds with thermodynamically and kinetically stabilizing groups which are absolutely stable at room temperature. Since the reactivity decreases with increasing stability of the silylenes, highly stabilized silylenes are less suitable as functional groups for the linkage of siloxanes. The laborious stabilization by complex ligands would also be too laborious and costly in large-scale technical quantities. With this one The method described for linking siloxanes is therefore not used in silylenes, but rather precursors which can be converted into silylenes by external influences. For this purpose, silirane compounds are particularly suitable, which can be split into silylene and olefin by means of suitable activation, for example by thermolysis or photolysis. The driving force behind the dissociation is the high ring tension of the siliranes. Silirane compounds are significantly more stable than their silylene analogues and can be seen as masked silylenes. The stability of the siliranes and the required decomposition temperature can be controlled by their functionalization. Siliranes can also react with nucleophilic compounds such as alcohols in a ring-opening reaction. Since it is an addition reaction, there is no cleavage product. By using siliranes in the linkage of siloxanes, these are consequently compatible with a very broad spectrum of functional groups. Due to the high ring tension in the cycle, siliranes are generally very reactive.

Scheme 2: Reaction behavior of siliranes and silylenes. Siliranes can be split by thermolysis or photolysis, with an olefin and a silylene being formed. In Macromolecules 2003, 36, 1474-1479, it was shown that monofunctional siliranes can be polymerized anionically.

Semenov et al. describe in (a) Russian Journal of Applied Chemistry 2002, 75 (1), 127-134, (b) Russian Chemical Reviews

2011, 80 (4), 3313-339, and (c) Applied Organometallic Chemistry 1990, 4, 163-172, Oligodimethylsilane as a source for photochemically generated silylenes for the crosslinking of silanol-terminated vinyl-methyl-siloxanes. The crosslinking takes place in that the highly reactive silylene forms a silirane with a vinyl group, which can then react with a silanol group. The siliranes formed were not detected during crosslinking, so the correctness of the mechanism is questionable. In addition, due to the low UV penetration, the method is only possible with very thin layers (~ 100 μm film).

The following bifunctional bis-silirane compounds are also known from Journal of Organometallic Chemistry 2011, 696, 1957-1963:

Scheme 3: Difunctional bis-siliranes by Fink et al.

Furthermore, it is known from WO2015 / 088901 that monosiliranes can be used for surface functionalization of substrates which are terminated with OH groups, NH2 groups or NH groups. Stabilized bis-silylenes (cf. Scheme 4) are also known from the literature (Angew. Chem. Int Ed. 2009, 48, 8536-8538 and J. Am. Chem. Soc. 2010, 132, 15890-15892), an application in the field however, polymer chemistry is not described.

Scheme 4: Stabilized bis-silylenes known from the literature.

The use of heterocyclic silylenes as catalysts for the polymerization of alkenes or alkynes is known only from US2002 / 0042489A1. Technical solution

The invention relates to silirane-functionalized compounds consisting of a substrate to which at least two silirane groups of the formula (I) are covalently bonded, where in formula (I) the index n assumes the value 0 or 1; and in which the radical R ^{a is} a divalent C1-C20 hydrocarbon radical, and where the radical R ^{1 is} selected from the group consisting of (i) Ci-C2o ~ hydrocarbon radical, (ii) C3.-C20 hydrocarbonoxy radical, (iii) silyl radical - SiR ^a R ^b R ^c , in which the radicals R ^a , R ^b , R ° are independently a C1-C6 hydrocarbon radical, (iv) amine radical - NR ^X 2, in which the radicals R ^{x are} independently selected from the group consisting of (iv.i) hydrogen, (iv.ii) C1-C20 hydrocarbon radical, and (iv.iii) silyl radical - SiR ^a R ^b R ^c , in which the radicals R ^a , R ^b , R ° are independently a C1-C6 hydrocarbon radical, and (v) imine radical -N = CR1R2, in which the radicals R ¹ , R ^{2 are} independently selected from the group consisting of (vi) hydrogen, (v.ii) C1-C20 hydrocarbon radical and (v.iii) silyl radical SiR ^a R ^b R ^c , in which the ^{R a} , R ^b , R ° radicals are, independently of one another, a C1-C6 hydrocarbon radical; and where the radicals R ² , R ³ , R ⁴ , R ⁵ are selected independently of one another from the group consisting of (i) hydrogen, (ii) halogen, and (iii) Ci-C2o hydrocarbon radical, in which the radicals R ² and R ^{4 can be} part of a cyclic radical.

The substrate is preferably selected from the group consisting of organosilicon compounds, hydrocarbons, silicas, glass, sand, stone, metals, semi-metals, metal oxides, mixed metal oxides, and carbon-based oligomers and polymers.

The substrate is particularly preferably selected from the group consisting of silanes, siloxanes, precipitated silica, fumed silica, glass, hydrocarbons,

Polyolefins, acrylates, polyacrylates, polyvinyl acetates, polyurethanes and polyethers made from propylene oxide and / or ethylene oxide units. A particular embodiment of the invention are silirane-functionalized organosilicon compounds of the general formula (II) wherein the radicals R ^{x are} independently selected from the group consisting of (i) hydrogen, (ii) halogen, (iii) unsubstituted or substituted C1-C20 hydrocarbon radical and (iv) unsubstituted or substituted Ci-C ₂ o-hydrocarbonoxy radical; and in which the indices indicate the number of the respective siloxane unit in the compound and, independently of one another, mean an integer in the range from 0 to 100,000, with the proviso that the sum of together assumes at least the value 2 and at least one of the indices ^ Is 2 or at least one of the indices c is not equal to 0; and the radicals R 'represent a silirane group of the formula (IIa) wherein the index n takes the value 0 or 1; and wherein the radical R ^{a is} a divalent C1-C20 hydrocarbon radical; and where the radical R ^{1 is} selected from the group consisting of (i) C1-C20 hydrocarbon radical, (ii) C1-C20-

Hydrocarbonoxy radical, (iii) silyl radical - SiR ^a R ^b R ^c , in which the radicals R ^a , R ^b , R ^{c are} independently a C1-C6 hydrocarbon radical, (iv) amine radical - NR ^x 2, in which the radicals R ^x independently are selected from one another from the group consisting of (iv.i) hydrogen, (iv.ii) -N = CR- ¹ R ² hydrocarbon radical, and (iv.iii) silyl radical - SiR ^a R ^b R ^c , in which the radicals R ^a , R ^b , R ° are independently a C1-C6 hydrocarbon radical, and (v) imine radical -N = CR ¹ R ² , in which the radicals R ^X , R ^{2 are} independently selected from the group consisting of (vi) hydrogen , (v.ii) C1-C20 hydrocarbon radical and (v.iii) silyl radical -SiR ^ ^h R ^® , in which the radicals R ^a , R ^b , R ^{c are} independently a C1-C6 hydrocarbon radical; and where the radicals R ² , R ³ , R ⁴ , R ⁵ are selected independently of one another from the group consisting of (i) hydrogen, (ii) halogen, and (iii) Ci-C2o hydrocarbon radical, in which the radicals R ² and R ^{4 can be} part of a cyclic radical.

The arrangement of the silicon atoms of the silirane-functionalized compounds is of elementary importance. It is imperative that the silicon atoms are connected to one another via a basic structure. In this way, after activation of the silirane-functionalized compound, a crosslinkable compound with several silylene groups is obtained. If the silicon atoms are not bridged, the activation of the siliranes generates free "monosilylenes" and multifunctional vinyl compounds. These free monosilylenes are not able to crosslink and react with the functional groups of the siloxanes (see Scheme 6). In formula (IIa), the radical R ^a is preferably a C ₁ -C ₃ -alkylene radical. The radical R ^a is particularly preferably an ethylene radical.

Via the substituent R ¹ on the silicon atom of a silirane, kinetic and thermodynamic control can be used to influence the reactivity and stability of the silirane-functionalized compounds. In formula (IIa), the radical R ¹ is preferably selected from the group consisting of (i) C1-C6 hydrocarbon radical and (ii) amine radical - N (SiR ^a R ^b R ^c ) 2, in which the radicals R ^a , R ^b , R ° are independently a C1-C6 hydrocarbon radical. In formula (IIa), the radical R ¹ is particularly preferably selected from the group consisting of (i) C1-C6-alkyl radical and (ii) - N (SiMe3) 2.

In formula (IIa), the radicals R ² , R ³ , R ⁴ , R ⁵ are preferably selected independently of one another from the group consisting of (i) hydrogen and (ii) C1-C6-alkyl radical, in which the radicals R ² and R ^{4 can be} part of a cyclic remainder. Are particularly preferred in formula (IIa), the radicals R ^2, R ^3, R ⁴ _z R ^{5 are} independently selected from the group consisting of (i) hydrogen and (ii) C1-C6 alkyl, wherein the radicals R ² and R ^{4 can be} part of a hexenyl radical.

A preferred embodiment are silirane-functionalized compounds, where in formula (II) the indices c assume the value 0 and the index takes the value 2; and where in formula (IIa) the index n assumes the value 1; and the radical R ^{a is} a C1-C3-alkylene radical; and the radical R ^{1 is} selected from the group consisting of (i) C1-C6 hydrocarbon radical and (ii) amine radical - N (SiR ^a R ^b R ^c ) 2, in which the radicals R ^a , R ^b , R ° are independent of one another a C1-C6 Are hydrocarbon radical; and the radicals R ² , R ³ , R ⁴ , R ^{5 are} independently selected from the group consisting of (i) hydrogen and (ii) C1-C6-alkyl radical, in which the radicals R ² and R ^{4 are also} part of a cyclic radical could be.

Another preferred embodiment are silirane-functionalized compounds, where in formula (II) the indices assume the value 0 and the index d 'assumes the value 2; and where in formula (IIa) the index n assumes the value 1; and R ^a is an ethylene radical; and the radical R ^{1 is} selected from the group consisting of (i) C1-C6-alkyl radical and (ii) - N (SiMe3) 2; and the radicals R ² , R ³ , R ⁴ , R ⁵ are selected independently of one another from the group consisting of (i) hydrogen and (ii) C1-C6-alkyl radical, in which the radicals R ² and R ^{4 are also} part of a hexenyl radical can.

Particularly preferred examples of the silirane-functionalized compounds according to the invention are the compounds SV1, SV2 and SV3 shown in Scheme 5.

Scheme 5: Particularly preferred silirane-functionalized compounds. The synthesis of the silirane-functionalized

Organosilicon compounds take place, for example, by reducing dihalosilanes with reducing agents such as lithium or potassium graphite in polar, coordinating solvents (eg tetrahydrofuran). The reduction of the dihalosilane groups results in intermediate silylenes, which are trapped with olefin compounds and react to form a silirane.

In general, all compounds with a double bond can be used as olefin compounds for scavenging the silylenes.

Since the substituents on the silirane ring have a decisive influence on the reactivity, the choice of olefin can also influence the behavior of the silirane-functionalized organosilicon compound. During the activation of the silirane-functionalized

Organosilicon compounds split the siliranes back into silyls and olefins. It is therefore advantageous to choose an olefinic compound which is gaseous under the reaction conditions of a conversion reaction and can volatilize.

Alternatively, the silirane-functionalized compounds can also be produced via a Wurtz coupling in which the C-C bond of the silirane ring is made.

The invention further provides a mixture comprising a) at least one silirane-functionalized compound according to the invention; and b) at least one compound A each having at least two radicals R ', the radicals R' being selected independently of one another from the group consisting of (i) -Si-H, (ii) -OH, (iii) -C _X H _2X -OH, in which x is an integer in the range from 1 to 20, (iv) -C _x H _2x -NH ₂ , in which x is an integer in the range from 1 to 20, (v) - SH, and (vi) - R ^a _n -CR = CR2, where R ^{a is} a divalent Ci-C20 hydrocarbon radical and the index n assumes the values 0 or 1 and the radicals R are selected independently of one another from the group consisting of (vi.i) hydrogen and (vi.ii) C1-C6 hydrocarbon radical.

A particular embodiment of the invention is a mixture, where the compound A is selected from functionalized siloxanes of the general formula (III) wherein the radicals R ^{x are} independently selected from the group consisting of (i) halogen, and (ii) unsubstituted or substituted C1-C20 hydrocarbon radical; and in which the radicals R ^{x are} independently selected from the group consisting of (i) hydrogen, (ii) - OH, (iii) - C _X H _2X -OH, where x is an integer in the range from 1 to 20, (iv) - C _x H _2x -NH ₂ , where x is an integer in the range from 1 to 20, (v) - SH, and (vi) - R ^a _n -CR = CR2, where R ^{a is} a divalent Ci -C2o hydrocarbon radical and the index n assumes the values 0 or 1 and the radicals R are independently selected from the group consisting of (i) hydrogen and (ii) C1-C6 hydrocarbon radical; and in which the indices are the

Specify the number of the respective siloxane unit in the compound and, independently of one another, denote an integer in the range from 0 to 100,000, with the proviso that the sum of a, together at least the

Assumes value 2 and at least one of the indices is or at least one of the indices is not equal to 0. The silirane-functionalized compounds according to the invention are stable precursors of the highly reactive silylenes. Each silirane group does not form a silylene group until the crosslinker has been activated. The silirane-functionalized compounds according to the invention must therefore have at least two silirane groups in order to be able to function as crosslinkers.

Scheme 6: Schematic comparison of two different bis-silirane structures. Above: silicon atoms of the silirane-functionalized compound bridged by a structural framework, results in a crosslinkable reactive bis-silylene species when activated. Bottom: Silirane groups not bridged by silicon atoms, disintegrate into non-crosslinking cleavage products when activated.

The invention further provides a process for the production of siloxanes comprising the following steps: (i) providing a mixture according to the invention in accordance with the particular embodiment, and (ii) converting the mixture by thermal, photochemical or catalytic activation. The linking of a mixture of functionalized siloxane of the formula (III) and a silirane-functionalized compound according to the invention can be achieved by thermal, photochemical or catalytic activation. During the linking process, the silirane units of the organosilicon compound react to form silylenes, which then react with functional groups of the siloxane and crosslink them. The silirane-functionalized compounds according to the invention (= conversion of the siliranes into silylenes) can be activated in different ways. The thermal activation requires a temperature above the decomposition temperature of the silirane compound. Furthermore, silirane compounds can be converted into silylenes by photochemical activation. The wavelength required for this is in the UV range. The reactivity of the siliranes is identical for both activation methods. Furthermore, catalysts can also be used to accelerate the linking reaction or for room temperature crosslinking. Suitable catalysts are compounds that destabilize siliranes and thus cause cleavage into silyls and olefins. Examples of such catalysts are AgOTf and Cu (OTf) 2. In general, the activation of the siliranes also gives rise to olefinic compounds (eg 2-butene).

The activated silirane-functionalized compounds can react with a wide range of functional groups due to their high reactivity. Possible reaction partners are, for example, Si-H, Si-OR, Si-OH, C-OH, -NH2, SH and vinyl. This supports all common functional groups of industrial siloxanes. The Functionalized siloxanes must have at least two of the functional groups mentioned for the formation of a network. The crosslinking of a difunctional siloxane with a silirane compound works in that a new vulnerable group and thus a node is formed with each insertion of the silylene formed.

Different functionalities on a (poly) siloxane are also possible (e.g. Si-OH terminated, methylvinyl groups in the chain). Vinyl-substituted (poly) siloxanes must have at least three vinyl groups due to their different reactivity (cycloaddition).

The properties of the crosslinked polymer can be changed through the length or the molecular mass of the functionalized siloxanes. The silylene linkage method can be carried out with both low-molecular and high-molecular, functionalized siloxanes. Examples of functionalized siloxane compounds are shown in Scheme 7.

Scheme 7: Examples of functionalized siloxanes which can be used for the reaction with the silirane-functionalized compounds according to the invention. The reaction of the silylenes with the functional groups of the siloxane takes place by inserting the silylene into the functional groups. When a silylene reacts with hydridosiloxanes and alkoxysiloxanes

Disilane bonds between the silirane-functionalized compound and siloxane. These disilanes have newly formed Si-H or Si-OR groups, which represent a further point of attack for silylenes. Each time a silylene reacts with the siloxane, another vulnerable functional group is created. Nucleophilic functional groups such as silanes, alcohols and amines also react with silylenes by inserting the silylene into the functional group. No disilanes are formed here, but rather siloxanes and silazanes, which also have a newly formed Si-H functionality for further crosslinking. By creating new points of attack during the reaction, it is also possible to use siloxanes with only two functional groups. Scheme 8: Overview of the possible crosslinking strategies for the formation of siloxane networks with hydridosiloxanes (left), siloxanes (middle) and vinylsiloxanes (right). To produce siloxanes, the silirane-functionalized compound according to the invention and the functionalized siloxane of the formula (III) are mixed until homogeneous mixing is ensured. The link is only made when the mixture is activated using one of the three methods mentioned above. The mixture is activated until the silirane-functionalized compound according to the invention has reacted completely or until the desired properties have been achieved. A successive networking process is also possible. In the case of air-sensitive silirane-functionalized compounds, contact with oxygen and water must be prevented by means of inert gas or other suitable measures.

The temperature during the reaction is chosen so that it is above the decomposition temperature of the silirane-functionalized compound, that is, silylenes are formed by thermolysis. The temperature is usually in a range from 60-200.degree. C., preferably in a range from 80-150.degree. C., particularly preferably in a range from 130-150.degree.

The silirane-functionalized compound is mixed with the functionalized siloxane of the formula (III) in a suitable molar ratio. The molar ratio of silirane groups: functional groups in the siloxane is usually in a range of 4: 1 1: 4, preferably in a range of 1: 1 1: 4. Examples

All syntheses were carried out under Schlenk conditions in baked glass equipment. Argon or nitrogen was used as protective gas. The chemicals used (vinylsilanes, vinylsiloxanes, silicone oils, etc.) were obtained from WACKER Chemie AG, from ABCR or from Sigma-Aldrich. Cis-2-butene (2.0) and trans-2-butene (2.0) were obtained from Linde AG. All solvents were dried and distilled before use. All silicone oils were dried and degassed over AI2O3 and 3 A molecular sieves before use. The molecular weights are given as average values and refer to the manufacturer's information. The polysiloxanes used are random copolymers. All chemicals used were stored under protective gas. Lithium with 2.5% sodium content was obtained by melting elemental lithium (Sigma-Aldrich, 99%, trace metal basis) and sodium (Sigma-Aldrich, 99.8%, sodium basis) at 200 ° C in a nickel crucible under an argon atmosphere . Before use, the Li / Na alloy was cut into as small pieces as possible in order to increase the surface area. Al2O3 (neutral) and activated charcoal were dried for 72 hours at 150 ° C in a high vacuum.

Magnetic resonance spectroscopy ( ¹ H, ²⁹ Si) was carried out with a Bruker Avance III 500 MHz.

Mass spectrometry was carried out using LIFDI-MS 700 with an ion source from Linden CMS. Elemental analyzes were carried out by the micro-analytical laboratory of the Faculty of Chemistry at the Technical University of Munich with a Vario EL from Elementar. Synthesis Example 1: Preparation of 1,3-bis (2- (1- (tert-butyl) -

2,3-dimethylsiliran-1-yl) ethyl) -1,1,3,3-tetramethyldisiloxane

(SV1)

The bis-silirane SV1 is synthesized via a three-stage reaction path, starting with the starting compound divinyltetramethyldisiloxane. In the first synthesis step, this is done via a

Hydrosilylation reaction with trichlorosilane in the presence of the Karstedt catalyst (platinum (0) -1,3-divinyl-l, 1,3,3-tetramethyldisiloxane complex) implemented. For this purpose, 100 g (740 mmol, 4.0 equivalents) of trichlorosilane are placed in a 250 mL Schlenk flask in 30 ml of toluene and mixed with 34.4 g (180 mmol, 1.0 equivalent) of divinyltetramethyldisiloxane. Then 0.05 ml of Karstedt's catalyst (2.1-2.4% Pt in xylene) is added to the reaction mixture and the mixture is stirred at room temperature for 18 hours. When the reaction is complete, the mixture is filtered through dried neutral aluminum oxide and residual solvent is removed in vacuo. 81.3 g (96%, 177 mmol) of the product (Cl3SiCH2CH2SiMe2) 2O are obtained as a clear, colorless liquid. ¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.10 (s, 12 H, CH ₃ ), 0.55-0.60 (m, 4 H, CH ₂ ), 1.05-1.10 (m, 4 H, CH ₂ ).

²⁹ Si-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 8.14 (SiO), 13.84 (SiCl ₃ ). EA [%): calculated: C = 21.01, H = 4.41, found: C = 20.93, H = 4.63

The following synthesis step takes place via the substitution of the hexachlorosilane with tert-butyllithium. For this purpose, 30.0 g (65.6 mmol, 1.0 equivalent) (Cl ₃ SiCH ₂ CH ₂ _{SiMe 2} ) ₂ O are dissolved in 75 ml of pentane and cooled to -10 ° C. 8.40 g (131 mmol, 2.0 equivalents) of 1.7 M tert-butyllithium solution are slowly added dropwise via a dropping funnel. The reaction is then warmed to 0 ° C. and stirred for 8 hours. Lithium chloride formed is filtered off and the filtrate is separated off from the solvent in vacuo. Subsequent sublimation of the crude product in a high vacuum (110 ° C., 10 ^-5 mbar) gives 22.0 g (67%, 43.9 mmol) of the tetrachlorosilane (Cl ₂ tBuSiCH ₂ CH ₂ SiMe ₂ ) ₂ O as a white solid.

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.05 (s, 12 H, Si-CH ₃ ), 0.78-0.82 (m, 4 H, CH ₂ ), 1.00 (s, 18H , SiC-CH ₃ ), 1.04-1.08 (m, 4 H, CH ₂ ).

²⁹ Si-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 8.22 (Si-O), 38.47 (Si-tBuCl ₂ ). EA [%]: calculated: C = 38.39, H = 7.65, found: C = 38.25,

H = 7.76

The last stage in the synthesis of the bis-silirane involves the reduction of the tetrachlorosilane using a lithium-sodium alloy (2.5% Na). For this reaction step, 10.0 g (20.0 mmol, 1.0 equivalent) of tetrachlorosilane (Cl ₂ _{tBuSiCH 2} CH ₂ _{SiMe 2} ) ₂ O are dissolved in 50 mL of THE. The reaction solution is cooled to -30 ° C, then 33.6 g (600 mmol, 30.0 equivalents) of cis-butene to be condensed. In an argon countercurrent, 2.10 g (300 mmol, 15.0 equivalents) of a lithium-sodium alloy (2.5% Na) are added and the reaction solution is stirred vigorously at room temperature for 7 days. When the reduction of the chlorosilane is complete, the solvent is removed in vacuo and the residue is taken up in pentane. The lithium salt which precipitates out is filtered off and the filtrate is dried again in vacuo. 7.80 g (86%, 16.7 mmol) of the bis-silirane SVl are obtained as a yellowish oil. Due to the purity of the cis-butene gas used (purity 2.0), not only the cis species but also the trans and 1-butene species can be found.

Trans species:

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.12-0.14 (m, 12 H, Si-CHa), 0.46-0.52 (m, 4 H, Si CH ₂ ), 0.74-0.78 (m, 4 H, Si-CH ₂ ), 1.12 (s, 18 H, SiC-CHa), (m, 4 H, Si-CH), 1.43-1.45 (m, 12 H, SiCH-CHa).

²⁹ Si NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = -53.11 (CH-Si-CH), 8.01 (Si-O).

Cis species:

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.14-0.16 (m, 12 H, Si-CH ₃ ), 0.86-0.88 (m, 8 H, CH ₂ ), 1.03 (s , 18 H, SiC-CHa), 1.08-1.11 (m, 4 H, Si-CHa), 1.43-1.45 (m, 12 H, SiCH-CHa).

²⁹ Si NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = -49.70 (CH-Si-CH), 7.30 (Si-O).

1-butene species:

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.07-0.10 (m, 12 H, Si-CH ₃ ), 0.59-0.68 (m, 4 H, Si-CH ₂ ), 0.79 -0.81 (m, 4 H, Si-CH ₂ ), 1.08 (s, 18 H, SiC-CHa), 1.18-1.19 (m, 2 H, CH ₂ Si-CH-CH ₂ CH ₃ ), 1.19- 1.20 (m, 4 _H, CHSi-CH _2), 1:39 to 1:40 (m, 4 _H, SiCHCH ₂ -CH _{_3),} 1:47 to 1:49 (m, 6 H, SiCHCH ₂ -CH _3).

²⁹ Si NMR: (294 K _, 500 MHz _, C ₆ D ₆ ) δ = -42.34 (CH ₂ -Si-CH) _, 6.89 (Si-O).

EA [%]: calculated: C = 61.20 _, H = 11.56, found: C = 58.13,

H = 11.31

LIFDI-MS: (THF) m / z = 471.95 [M] ⁺ , 415.99 [M-C4H ₈ ] ⁺ , 360.01 [M-C ₈ HI ₆ ] ⁺ .

Since the three bis-siliranes mentioned are stereoisomers, they have the same molecular mass. They are therefore indistinguishable in the mass spectrum. The same applies to the results of the elemental analysis.

Synthesis Example 2: Preparation of 1,3-bis (2- (7- (butyl) -

7-silabicyclo [4.1.0] heptan-7-yl) ethyl) -1,1,3,3-tetramethyldisiloxane (SV2)

The tetrachlorosilane (Cl ₂ CH ₂ SiMe ₂ tBuSiCH ₂₎ ₂ 0, which represents in this synthesis, the starting compound is prepared in an analogous way as in Synthesis Example. 1 For the subsequent reduction, 1.00 g (2.00 mmol,

1.0 equivalent) tetrachlorosilane with 3.94 g (47.9 mmol,

24.0 equivalents) of cyclohexene mixed in 2.5 ml of THF. 208 mg (29.9 mmol, 25.0 equivalents) of a lithium-sodium alloy (2.5% Na) are added to the reaction solution and stirred vigorously for 10 hours at room temperature. After all the chlorosilanes have been reduced, the solvent and excess cyclohexene are removed in vacuo and the residue is resuspended in 5 ml of pentane. The LiCl which precipitates out is separated off and the filtrate is dried in vacuo. 382 mg (37%, 0.73 mmol) of the bis-silirane SV2 are obtained as a clear oil. One cis and one trans species of the bis-silirane SV2 are obtained. Cis species:

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.13-0.15 (m, 12 H, Si-CH ₃ ), 0.90 (m, 8 H, Si-CH ₂ ), 1.03 (s , 18 H, SiC-CH ₃ ), 1.49-1.54 (m, 8 H, SiCHCH ₂ -CH ₂ ), 1.71-1.78 (m, 8 H, SiCH-CH ₂ ), 1.98-2.05 (m, 4 H, Yourself). ²⁹ Si-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ - 49.09 (Si-CH), 7.27 (Si

0).

Trans species:

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.12-0.13 (m, 12 H, Si-CH ₃ ), 0.47-0.52 (m, 4 H, Si-CH ₂ ), 0.77 -0.81 (m, 4 H, Si-CH ₂ ), 1.15 (s, 18 H, SiC-CH ₃ ), 1.64-1.67 (m, 4 H, Si-CH), 1.781.83 (m, 8 H, SiCHCH ₂ -CH ₂ ), 1.88-197 (m, 8 H, SiCH-CH ₂ ).

²⁹ Si-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = -53.75 (Si-CH), 7.89 (Si

0).

Synthesis Example 3: Preparation of 1,3-bis (2- (7- (tert-butyl) -

7-silabicyclo [4.1.0] heptan-7-yl) ethyl) -1,1,3,3-tetramethyldisiloxane (SV3)

The bis-silirane SV3 is prepared via a two-stage synthesis from the corresponding hexachlorosilane. In the first stage, 10.0 g (21.9 mmol, 1.0 equivalent) (Cl3SiCH ₂ CH ₂ _{SiMe 2} ) 2O are initially charged in 40 ml of THF and cooled to 0 ° C. A solution of 8.72 g (43.7 mmol, 2.0 equivalents) of potassium hexamethyldisilazane (KHMDS) in 30 ml of THF is then slowly added dropwise over a period of 30 minutes. The resulting suspension is stirred for 6 hours at room temperature. The solvent is then removed in vacuo. The residue is taken up in 40 mL pentane and then filtered. After the solvent has been removed again in vacuo, 12.5 g (81%, 17.7 mmol) (TMS ₂ NCl ₂ SiCH ₂ CH ₂ SiMe ₂ ) 2O are obtained as a yellowish, clear liquid.

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.07 (s, 12 H, OSi-CH3), 0.33 (s, 36 H, NSi-CH3), 0.830.87 (m, 4 H, OSi-CH ₂ ), 1.25-1.29 (m,

4 H, NSi-CH2). ²⁹ Si-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 2.19 (Si-Cl ₂ ), 6.38 (Si-Me ₃ ), 8.45 (Si-O).

EA [%): calculated: C = 33.97, H = 07.98, N = 03.96, found:

C 33.39, H = 07.96, N = 03.94 The subsequent reaction step involves the reduction of the tetrachlorosilane to the corresponding bis-silirane. For this, 10.0 g (14.2 mmol, 1.0 equivalent)

Dissolve (TMS2NCl ₂ SiCH2CH2SiMe ₂ ) 2O in 50 mL THF and heat the reaction mixture to -30 ° C. Then 23.10 g (424 mmol, 30.0 equivalents) of cis-butene are condensed into the reaction vessel and 1.47 g (212 mmol,

15.0 equivalents) lithium-sodium alloy (2.5% Na) was added in an argon countercurrent. The reaction mixture is warmed to room temperature and stirred for 5 days. After the chlorosilane has been completely reduced, the solvent is removed in vacuo and the residue is resuspended in 30 mL pentane. The lithium chloride which precipitates out is separated off and the product solution is filtered through dried, neutral aluminum oxide. The filtrate is then dried in vacuo, and 5.46 g (57%, 8.06 mmol) of a cis / trans mixture and the corresponding bis-silirane SV3 from the 1-butene species are obtained as a yellowish, cloudy oil . Cis species:

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.12-0.13 (m, 12 H, OS1-CH3), 0.22 (s, 36 H, NS1CH3), 0.77-0.80 (m, 8 H, CH ₂ ), 1.12-1.15 (m,

4 H, Si-CH), 1.19-1.21 (m, 12 H, CH-CH ₃ ).

²⁹ Si-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = -50.01 (CH-Si-CH), 4.71 (N-Si-TMS), 7.81 (Si-O).

Trans species:

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.11-0.12 (m, 12 H, Si-CH ₃ ), 0.25-0.26 (m, 36 H, NSiCH3), 0.47-0.52 ( m, 4 H, CH _2), 0.81-0.85 (m, 4 H, CH _2), 1:17 to 1:18 (m, 4 H, Si-CH), 1.271.30 (m, 12 H, CH-CH3).

²⁹ Si-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = -44.90 (CH-Si-CH), 4.70 (N-Si-TMS), 7.68 (Si-O). 1-butene species:

¹ H-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = 0.09-0.10 (m, 12 H, Si-CH ₃ ), 0.23-0.24 (m, 36 H, NSiCHg), 0.52-0.57 ( m, 4 H, SiCH ₂ ), 0.67-0.71 (m, 4 H, SiCH ₂ ), 0.93-0.99 (m, 4 H, SiCH-CH ₂ ), 1.27 (m, 2 H, CH ₂ Si-CH) , 1.34-1.35 (m, 6H, SiCHCH ₂ -CH ₃ ).

²⁹ Si-NMR: (294 K, 500 MHz, C ₆ D ₆ ) δ = -41.12 (CH-Si-CH), 5.31 (N-Si-TMS), 7.86 (Si-O).

EA [%]: calculated: C = 49.63, H = 10.71, N = 4.13, found:

C = 47.34, H = 10.60, N = 3.98

LIFDI-MS: (THF) m / z = 675.69 [M] ⁺ , 619.75 [MC ₄ H ₈ ] ⁺ , 564.25 [M- C ₈ Hi6] ⁺ , 244.06 [MC ₂₀ H ₅₂ N ₂ Si ₄ ] ⁺ .

Application example 1: Crosslinking of hydridomethylsiloxane-dimethylsiloxane copolymer with SVl

SVl (100 mg, 212.3 μmol,

1.0 equivalent) and silicone oil (254 mg, 106.2 μπιοΐ,

0.5 equivalents, 2,395 g / mol, (25-30% methylhydridosiloxane-dimethylsiloxane copolymer, Si-H terminated)) weighed in in a molar ratio of 1: 2 (silirane groups: Si-H groups) under protective gas. The mixture is taken up in 0.5 ml of pentane and stirred with a magnetic stir bar until homogeneous mixing is ensured. The pentane is then removed again in vacuo. The crosslinking takes place at 140 ° C for 24 hours under protective gas. The product is a slightly cloudy, colorless and slightly elastic polymer which is not sticky. The material is due to the short chain length of the siloxane is quite brittle and tears under tensile load. The polymer swells a lot in benzene and does not dissolve. Soluble constituents could not be detected by NMR spectroscopy. The butene formed during crosslinking can be perceived through the characteristic odor.

Application example 2: Crosslinking of hydridomethylsiloxane-dimethylsiloxane copolymer with SV3

SV3 (100 mg, 147.6 μmol,

1.0 equivalent) and silicone oil (233 mg, 97.4 μmol,

0.66 equivalents, 2,395 g / mol, (25-30% methylhydridosiloxane-dimethylsiloxane copolymer, Si-H terminated)) weighed in at a molar ratio of 1: 3 (silirane groups: Si-H groups) under protective gas. The mixture is stirred with a magnetic stir bar until homogeneous mixing is ensured. The crosslinking takes place at 140 ° C for 24 hours under protective gas. The product is a clear, slightly yellowish and slightly elastic polymer which is not sticky. Due to the short chain length of the siloxane, the material is quite brittle and tears when subjected to tensile stress. The polymer swells a lot in benzene and does not dissolve. Soluble constituents could not be detected by NMR spectroscopy.

Application example 3: Crosslinking of hydridomethylsiloxane-dimethylsiloxane copolymer with SV3

SV3 (100 mg, 147.6 μmol,

1.0 equivalent) and silicone oil (78 mg, 32.5 μmol,

0.22 equivalents, 2,395 g / mol, (25-30% methylhydridosiloxane-dimethylsiloxane copolymer, Si-H terminated)) weighed in in a molar ratio of 9:10 (silirane groups: Si-H groups) under protective gas. The mixture is stirred with a magnetic stir bar until homogeneous mixing is ensured. The crosslinking takes place at 140 ° C for 24 hours under protective gas. The product is a clear, slightly yellowish and slightly elastic polymer which is not sticky. Due to the short chain length of the siloxane, the material is quite hard and brittle and tears when subjected to tensile stress. The polymer swells a lot in benzene and does not dissolve. Soluble constituents could not be detected by NMR spectroscopy. Due to the higher proportion of silirane, the polymer is significantly stronger than in application example 2.

Application example 4: Inert gas-free crosslinking of hydridomethylsiloxane-dimethylsiloxane copolymer with SV3

SV3 (100 mg, 147.6 μmol,

1.0 equivalent) and silicone oil (78 mg, 32.5 μmol,

0.22 equivalents, 2,395 g / mol, (25-30% methylhydridosiloxane dimethylsiloxane copolymer, Si-H terminated)) in a molar ratio of 9:10 (silirane groups: Si-H groups) weighed in under protective gas. The mixture is stirred in air with a magnetic stir bar until homogeneous mixing is ensured. Crosslinking takes place in air at 140 ° C. for 24 hours. The product is a clear, slightly yellowish and elastic polymer that is not sticky. The material shows properties similar to those of the elastomer described from application example 3. Oxygen and moisture from the ambient air have no noticeable influence on the crosslinking of the polymer. The bis-silirane SV3 is thus sufficiently stable to air. Application example 5: Crosslinking of hydridomethylsiloxane-dimethylsiloxane copolymer with SV1

SV1 (87.5 mg, 185.6 μmol,

10.0 equivalents) and silicone oil (1.03 g, 18.58 μmol,

1.0 equivalent, 55,000 g / mol, (0.5-1% methylhydridosiloxane dimethylsiloxane copolymer, TMS terminated)) weighed in at a molar ratio of 20: 6 (silirane groups: Si-H groups) under protective gas. The mixture is stirred with a magnetic stir bar until homogeneous mixing is ensured. The crosslinking takes place at 140 ° C for 24 hours under protective gas. The product is a white, opaque and elastic polymer which is not is sticky. The polymer swells a lot in benzene and does not dissolve. Soluble constituents could not be detected by NMR spectroscopy. Application example 6: Cross-linking of 2,4,6,8-

Tetramethylcyclotetrasiloxane (TMCTS) with SVl

SVl (100 mg, 212.3 μmol,

1.0 equivalents) and the cyclic siloxane TMCTS (23 mg,

95.53 μmol, 0.45 equivalents, 2,4,6,8-

Tetramethylcyclotetrasiloxane) in a molar ratio of 1: 0.9 (silirane groups: Si-H groups) weighed in under protective gas. The mixture is stirred with a magnetic stir bar until homogeneous mixing is ensured. The subsequent crosslinking takes place at 140 ° C for 24 hours under protective gas in a closed system. The resulting product is a solid, transparent and non-sticky polymer with slightly elastic properties. The polymer swells a lot in benzene without dissolving. No soluble components could be detected by NMR spectroscopy.

Application example 7: Crosslinking of short-chain OH-terminated polydimethylsiloxane with SVl

SV1 (50 mg, 106.2 μmol,

1.0 equivalent) and silicone oil (1.03 g, 106.2 μmol,

1.0 equivalent, 9,750 g / mol, polydimethylsiloxane, OH-terminated)) in a molar ratio of 1: 1 (silirane groups: Si-OH groups) weighed in under protective gas. The mixture is stirred with a magnetic stir bar until homogeneous mixing is ensured. Crosslinking then takes place at 140 ° C. for 24 hours under protective gas. The resulting polymer is colorless, slightly cloudy, non-sticky and shows elastic properties.

Application example 8: Crosslinking of short-chain OH-terminated polydimethylsiloxane with SV3

SV3 (50 mg, 73.79 μmol,

1.0 equivalent) and silicone oil (721 mg, 73.79 μπιοΐ,

1.0 equivalent, 9,750 g / mol, polydimethylsiloxane, OH-terminated)) in a molar ratio of 1: 1 (silirane groups: Si-OH groups) weighed in under protective gas. The mixture is stirred with a magnetic stir bar until homogeneous mixing is ensured. Crosslinking then takes place at 140 ° C. for 24 hours under protective gas. The resulting product is a colorless, slightly cloudy, elastic polymer. There is a strong one Swelling of the polymer in benzene without dissolving. No soluble components could be detected by NMR spectroscopy. Alternatively, molar mixing ratios of 0.5: 1 (silirane groups: Si-OH groups) and 2: 1 (silirane groups: Si-OH groups) are used in an analogous procedure. In the first case, colorless, clear, very soft and sticky elastomers are obtained. If the crosslinker is added in excess of stoichiometric, a colorless, cloudy polymer with elastic properties is obtained. The polymer obtained is softer compared to the 1: 1 mixture.

Application example 9: Crosslinking of long-chain OH-terminated polydimethylsiloxane with SV1

SV1 (34 mg, 73.8 μmol,

1.0 equivalent) and silicone oil (67 mg, 73.8 μmol,

1.0 equivalent, 36,000 g / mol, polydimethylsiloxane, OH-terminated) in a molar ratio of 1: 1 (silirane groups: Si-OH groups) weighed in under protective gas. The mixture is stirred with a magnetic stir bar until homogeneous mixing is ensured. The subsequent crosslinking takes place at 140 ° C for 24 hours under protective gas. The result is a cloudy, soft and elastic polymer. Due to the longer chains in comparison to application example 7, the polymer network is more flexible, which explains the lower strength of the elastomer formed. The polymer swells a lot in benzene without to be solved in the process. No soluble components could be detected by NMR spectroscopy.

Application example 10: Crosslinking of long-chain OH-terminated polydimethylsiloxane with SV3

SV3 (50 mg, 73.8 μmol,

1.0 equivalent) and silicone oil (67 mg, 73.8 μmol, 1.0 equivalent, 36,000 g / mol, polydimethylsiloxane, OH-terminated)) in a molar ratio of 1: 1 (silirane groups: Si-OH groups) weighed in under protective gas. The mixture is stirred with a magnetic stir bar until homogeneous mixing is ensured. The subsequent crosslinking takes place at 140 ° C for 24 hours under protective gas. The resulting polymer is a clear, colorless, non-sticky elastomer. The polymer swells considerably when benzene is added, but the polymer does not dissolve. No soluble components could be detected by NMR spectroscopy.

Claims

1. Silirane-functionalized compounds consisting of a substrate to which at least two silirane groups of the formula (I)

(I), are covalently bonded, where in formula (I) the index n assumes the value 0 or 1; and wherein the radical R ^{a is} a divalent C ₁ -C ₂₀ hydrocarbon radical; and where the radical R ^{1 is} selected from the group consisting of (i) Ci-C ₂ o ~ hydrocarbon radical, (ii) Ci- C ₂₀ -hydrocarbonoxy radical, (iii) silyl radical - SiR ^a R ^b R ^c , in which the radicals R ^a , R ^b , R ° are independently selected from the group consisting of C1-C6 hydrocarbon radical, (iv) amine radical - NR ^x 2, in which the radicals R ^{x are} independently selected from the group consisting of (iv.i ) Hydrogen, (iv.ii) C ₁ -C ₂₀ hydrocarbon radical, and (iv.iii) silyl radical - SiR ^a R ^b R ^c , in which the radicals R ^a , R ^b , R ° independently of one another are a C1-C6 hydrocarbon radical, and (v) imine radical -N = CR ¹ R ² , in which the radicals R ¹ , R ^{2 are} independently selected from the group consisting of (vi) hydrogen, (v.ii) Ci-C ₂ o-hydrocarbon radical and (v.iii) silyl radical SiR ^a R ^b R ^c , in which the radicals R ^a , R ^b , R ^{c are} independently a C1-C6 hydrocarbon radical; and where the radicals R ² , R ³ , R ⁴ , R ⁵ are selected independently of one another from the group consisting of (i) hydrogen, (ii) halogen, and (iii) C1-C20 hydrocarbon radical, in which the radicals R ² and R ^{4 can be} part of a cyclic radical.

2. Silirane-functionalized compounds according to claim 1, characterized in that the substrate is selected from the group consisting of organosilicon compounds, hydrocarbons, silicas, glass, sand, stone, metals, semi-metals, metal oxides, mixed metal oxides, and carbon-based oligomers and polymers.

3. Silirane-functionalized compound according to claim 2, characterized in that the substrate is selected from the group consisting of silanes, siloxanes, precipitated silica, fumed silica, glass, hydrocarbons, polyolefins, acrylates, polyacrylates, polyvinyl acetates, polyurethanes and polyethers made from propylene oxide and / or ethylene oxide units.

4. Silirane-functionalized compounds according to claim 1, characterized in that they are silirane-functionalized organosilicon compounds which are selected from the group consisting of compounds of the general formula (II) wherein the radicals R ^{x are} independently selected from the group consisting of (i) hydrogen, (ii) halogen, (iii) unsubstituted or substituted C1-C20 hydrocarbon radical and (iv) unsubstituted or substituted C1-C20 hydrocarbonoxy radical; and in which the indices indicate the number of the respective siloxane unit in the compound and, independently of one another, mean an integer in the range from 0 to 100,000, with the proviso that the sum of together take on at least the value 2 and at least one of the indices is or at least one of the indices is not equal Is 0; and the radicals R 'represent a silirane group of the formula (IIa) wherein the index n takes the value 0 or 1; and wherein the radical R ^{a is} a divalent C1-C20 hydrocarbon radical; and where the radical R ^{1 is} selected from the group consisting of (i) Ci-C2o hydrocarbon radical, (ii) Ci- C2o hydrocarbonoxy radical, (iii) silyl radical - SiR ^a R ^b R ^c , in which the radicals R ^a , R ^b , R ^{c are} independently a C1-C6 hydrocarbon radical, (iv) amine radical - NR ^x a, in which the radicals R ^{x are} independently selected from the group consisting of (iv.i) hydrogen, (iv.ii) Ci- C2o hydrocarbon radical, and (iv.iii) silyl radical - SiR ^a R ^b R ^c , in which the radicals R ^a , R ^b , R ^{c are} independently a C1-C6 hydrocarbon radical, and (v) imine radical - -N = CR ¹ R, ² wherein the radicals R ^X , R ^{2 are} independently selected from the group consisting of (vi) hydrogen, (v.ii) Ci-Cao hydrocarbon radical and (v.iii) silyl radical -SiR ^a R ^b R ^c in which the radicals R ^a , R ^b , R ° are, independently of one another, a C1-C6 hydrocarbon radical; and where the radicals R ² , R ³ , R ⁴ , R ^{5 are} independently selected from the group consisting of (i) hydrogen, (ii) halogen, and (iii) C1-C20 hydrocarbon radical, in which the radicals R ² and R ^{4 can be} part of a cyclic radical.

5. silirane-functionalized compounds according to claim 4, wherein in formula (II) the indices assume the value 0 and the index d 'den Takes value 2; and where in formula (IIa) the index n assumes the value 1, and the radical R ^{a is} a Ci-Cg -alkylene radical, and the radical R ^{1 is} selected from the group consisting of (i) C1-C6 hydrocarbon radical and ( ii) Amine radical - N (SiR ^a R ^b R ^c ) 2, in which the radicals R ^a , R ^b , R ° are independently a C1-C6 hydrocarbon radical, and the radicals R ² , R ³ , R ⁴ , R ⁵ are independently selected from the group consisting of (i) hydrogen and (ii) Ci- Ce-alkyl radical, in which the radicals R ² and R ^{4 can also be} part of a cyclic radical.

6. silirane-functionalized compounds according to claim 5, wherein in formula (IIa) the radical R ^{a is} an ethylene radical; and the radical R ^{1 is} selected from the group consisting of (i) C1-C6-alkyl radical and (ii) - N (SiMe3) 2; and the leftovers R ² , R ³ , R ⁴ , R ^{5 are} independently selected from the group consisting of (i) hydrogen and (ii) C1-C6-alkyl radical, in which the radicals R ² and R ^{4 can also be} part of a hexenyl radical.

7. Silirane-functionalized compounds according to any one of claims 4-6, wherein these are selected from the following compounds

8. Mixture comprising a) at least one silirane-functionalized compound according to any one of claims 1-7; and b) at least one compound A each having at least two radicals R ', the radicals R' being selected independently of one another from the group consisting of (i) -Si-H, (ii) -OH, (iii) -C _X H _2X -0H, in which x is an integer in the range from 1 to 20, (iv) -C _X H _2x -NH ₂ , in which x is an integer in the range from 1 to 20,

(v) - SH, and (vi) - R ^a _n -CR = CRa, in which R ^{a is} a divalent Ci-C2o hydrocarbon radical and the index n assumes the values 0 or 1 and the radicals R are selected independently of one another from the Group consisting of (vi.i) hydrogen and (vi.ii) C1-C6 hydrocarbon radical.

9. Mixture according to claim 8, wherein the compound A is selected from functionalized siloxanes of the general formula (III) wherein the radicals R ^{x are} independently selected from the group consisting of (i) halogen, and (ii) unsubstituted or substituted C1-C20 hydrocarbon radical; and in which the radicals R 'are independently selected from the group consisting of (i) hydrogen, (ii)

- OH, (iii) - C _X H2 _X -OH, where x is an integer in the range from _{1-20, (iv) - C X} H2 _X -NH2, where x is an integer in the range from 1-20 , (v) - SH, and (vi)

- R ^a _n -CR = CR2, where R ^{a is} a divalent C1-C20 hydrocarbon radical and the index n assumes the values 0 or 1 and the radicals R are selected independently of one another from the group consisting of (vi.i) hydrogen and (vi.ii) C1-C6 hydrocarbon radical; and in which the indices indicate the number of the respective siloxane unit in the compound and, independently of one another, mean an integer in the range from 0 to 100,000, with the proviso that the sum of together take on at least the value 2 and at least one of the indices is or at least one of the indices is not equal 0 is.

10. A process for the preparation of siloxanes, comprising the following steps:

(i) providing a mixture according to claim 9, and

(ii) Conversion of the mixture by thermal, photochemical or catalytic activation.

11. The method according to claim 10, wherein the activation takes place thermally and the temperature is in a range from 60 ° C to 200 ° C.

12. The method according to claim 10 or 11, wherein the molar ratio of silirane groups: functional groups in the siloxane is in a range of 4: 1 1: 4.