EP1789426A1 - Procede de production efficace de methyltrioxorhenium(vii) (mto) et d'oxydes d'organorhenium(vii) - Google Patents

Procede de production efficace de methyltrioxorhenium(vii) (mto) et d'oxydes d'organorhenium(vii)

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Publication number
EP1789426A1
EP1789426A1 EP05781750A EP05781750A EP1789426A1 EP 1789426 A1 EP1789426 A1 EP 1789426A1 EP 05781750 A EP05781750 A EP 05781750A EP 05781750 A EP05781750 A EP 05781750A EP 1789426 A1 EP1789426 A1 EP 1789426A1
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EP
European Patent Office
Prior art keywords
vii
reagent
compound
functionalized
prepared
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EP05781750A
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German (de)
English (en)
Inventor
Wolfgang A. Herrmann
Fritz E. KÜHN
Richard Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cata TECH GmbH
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Cata TECH GmbH
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F13/00—Compounds containing elements of Groups 7 or 17 of the Periodic Table

Definitions

  • the present invention relates to a novel process for the preparation of organorhenium (VII) oxides.
  • Methyltrioxorhenium (VII) (abbreviated MTO) as the parent compound of Organorhenium (VII) oxides, was first published in 1979 by /. R Beattie and PJ Jones reports (Inorg Chem., 1979, 18, 2318). It is formed in up to 50% yield from trimethyldioxorhenium (VI) (CH 3 ) 3 ReO 2 or tetramethyloxorhenium (VII) (CH 3 J 4 ReO, the starting compounds having to be exposed to dry air for weeks to effect conversion to MTO.
  • MTO Methyltrioxorhenium
  • Carboxylic anhydrides and tetraalkyltin compounds implemented.
  • halogenated carboxylic anhydrides preferably trifluoroacetic anhydride
  • the yields are 80-90%, wherein the separation of the resulting (trialkylstannyl) - carboxylic acid anhydrides from the MTO formed requires many operations and is therefore tedious.
  • the described reaction remains limited to the few reactive tin compounds. This limits its synthetic bandwidth.
  • Patent: Aventis US Patent 6,180,807, DE 19717178 are inorganic or organometallic perrhenates with a silylation reagent (preferably trimethylsilyl chloride TMS-CI) and an organylating reagent o (usually tetraalkyltin R 4 Sn or dialkylzinc R 2 Zn) to the corresponding organorhenium (VII) oxide implemented.
  • a silylation reagent preferably trimethylsilyl chloride TMS-CI
  • organylating reagent o usually tetraalkyltin R 4 Sn or dialkylzinc R 2 Zn
  • the yield of MTO is 80%.
  • the zinc alkyls R 2 Zn - especially (ChU) 2 Zn and (CH 3 CH 2 ) 2 Zn - are spontaneously flammable.
  • good yields are rarely achieved, moreover, the reaction must be carried out at very low temperatures (-78 0 C or below), otherwise reduction of the rhenium (VII) precursors to low-valent rhenium compounds occurs.
  • the processing of such approaches is cumbersome and tedious. This leads to a significantly increased preparative effort and thus also to higher costs.
  • the object has now yet and surprisingly been solved by reacting the rhenium (VII) -containing precursor with a functionalized organylating reagent whose organylating properties are matched by certain substituents to the respective rhenium precursors and reaction conditions.
  • a functionalized organylating reagent whose organylating properties are matched by certain substituents to the respective rhenium precursors and reaction conditions.
  • An object of the invention is thus a process for the preparation of an organorhenium (VII) oxide from a rhenium (VII) -containing precursor and a dimensionally functionalized organylating reagent.
  • halogens such as F, Cl, Br or I
  • pseudohalogens such as cyanide and rhodanide (SCN) 1 O-functional
  • Alkanesulfanyloxy or arylsulfanyloxy or N-functional groups such as
  • the functionalized organylating reagent used is an organometallic compound containing at least one organic radical to be transferred to the rhenium (VII) -containing precursor and at least one functionalizing radical other than that which may also be a Lewis basic solvent ligand (e.g., THF).
  • VI rhenium
  • THF Lewis basic solvent ligand
  • the invention relates to a process for the preparation of compounds of the formula (I)
  • a, b and c is such as to satisfy the segregation of rhenium, provided that c is not greater than 4 times b, preferably not greater than 3 times b, and wherein R is the same or different and an aliphatic hydrocarbon radical having 1 to 20 C atoms, preferably having 1 to 10 C atoms, an aromatic hydrocarbon radical having 6 to 20 C atoms, preferably having 6 to 10 C atoms or arylalkyl radical having 7 to 20 C atoms, preferably with 7-13 C atoms, where the radical R may optionally each be independently or differently substituted one or more times and joined to the ligand.
  • Substituents on the radical R are preferably selected from halogen, hydroxyl, Ci.i 0 - alkoxy, Cs-1 0 -Aryloxy, Ci -2 o-acyloxy, Ci.io-alkylamino and / or Ce-io-arylamino, wherein alkyl substituents additionally with halogen or / and C 6 -io-
  • Aryl and aryl substituents may additionally be substituted by halogen or / and Ci-i O alkyl.
  • Particularly preferred examples of R are methyl,
  • Lewis basic neutral ligands are pyridine, quinuclidine, pyrazole, tetrahydrofuran, acetonitrile and ⁇ -aromatics, e.g. Toluene.
  • Preferred examples of Lewis basic anionic ligands are halides and pseudohalides.
  • Suitable rhenium-containing compounds from which the substance class (I) is prepared according to the invention are all compounds having a perrhenyl function "O 3 Re +" , ie compounds of the general formula (II) of the trivalent rhenium:
  • L a Lewis basic neutral or anionic ligand
  • X any residue with formally single or multiple negative charges.
  • Lewis basic neutral ligands are as previously indicated.
  • the compound (II) is preferably an ester of perrhenic acid with an alcohol or silanol, a mixed anhydride of perrhenic acid with an organic acid, e.g. a carboxylic acid, an amide of perrhenic acid with ammonia or an amine or a halide of perrhenic acid.
  • Preferred examples of negatively charged radicals X are halides, for example Cl " , carboxylates, such as acetate or trifluoroacetate, or perrhenate [ReO 4 ].
  • carboxylates such as acetate or trifluoroacetate
  • the required rhenium-containing compound of formula (II) is prepared in situ from other rhenium-containing compounds (e.g., dirhenium heptoxide or a perrhenate) with an activating reagent (e.g., an acid anhydride, or a halo-trialkylsilane).
  • an activating reagent e.g., an acid anhydride, or a halo-trialkylsilane.
  • activating reagents are carboxylic acid anhydrides such as
  • the reactivity of the rhenium-containing substrate is adapted to that of the Organyl michsreagenzes.
  • the functionalized organylating reagents used are preferably compounds of the formula (III):
  • M Al, In, Ga, Cu, Zn, Sc, Y, La, a lanthanoid (eg Ce) or a
  • X a halogen, cyclopentadienide, pseudohalogen, alkoxy, aryloxy, siloxy, oxide, sulfide, acyloxy, alkanesulfanyloxy,
  • S a coordinated solvent molecule, e.g. tetrahydrofuran,
  • R is the same or different and is an aliphatic hydrocarbon group of 1 to 20 carbon atoms, an aromatic hydrocarbon group of 6 to 20 atoms or arylalkyl group Represents 7 to 20 atoms, wherein the radical R may optionally be selected independently of one another and may be substituted identically or differently.
  • the functionalized organylating reagents may also be oligomeric or polymeric, for which dimethylaluminum oxide [(CH 3 ) 2 Al-O-] X and [CH 3 Zn-O-] x are typical examples (x> 2).
  • X is particularly preferably an acyloxy or halogen group, for example Cl or acetate. Also preferred are alkoxides and amides. Substituent on the group X are preferably selected from Ci-C ⁇ 0 -aryl radicals, for example methyl or ethyl, and C 6 -C, where the alkyl radicals optionally mono- or polysubstituted by halogen, hydroxyl, Ci-C 4 -alkoxy or / and C 6 -C 0 aryl may be substituted and the aryl radicals in turn optionally substituted by halogen, hydroxyl and / or dC 4 alkyl may be substituted.
  • Acyloxyreste are preferably the radicals of Ci-C 6 alkyl or C 6 -Cio-Arylcarbonklaren, wherein alkyl and aryl, as indicated above, may be substituted.
  • R preferably have the meanings given for the compounds (I). More preferably R is selected from methyl, methyl- [D 3 ], ethyl, propyl, cyclopropyl, phenyl, mesityl, cyclopentadienyl and chloromethyl.
  • variable design of the substituent X allows the reactivity and solubility of the alkylating reagent to be adjusted very precisely to the reaction conditions and the respective rhenium precursor.
  • the criticality of the exact choice of the alkylating reagent for the synthesis success is shown, for example, by the fact that the reaction of Re 2 O 7 with Zn (CH 3 ) 2 gives known reduced products such as (CH 3 ) 4 Re 2 O 4 , while with CH 3 Zn (OAc) or CH 3 ZnCl exclusively the desired CH 3 ReO 3 (MTO) is formed.
  • the organylating reagent [RfMX 9 -Sh] '(III) is prepared in situ from suitable precursors.
  • An example which may be mentioned is the / ⁇ -s / fu synthesis of zinc compounds of the formula RZnX, where R and X are as defined above.
  • One possibility for this is the treatment of zinc salts of the formula ZnX 2 with an organylating reagent which can transfer the desired R group.
  • CH 3 ZnCl The synthesis of CH 3 ZnCl can be carried out, for example, by reacting ZnCl 2 with methylating reagents such as CH 3 Li, (CH 3 ) MgCl or methyl group-containing aluminum reagents, in particular trimethylaluminum or dimethylaluminum chloride.
  • methylating reagents such as CH 3 Li, (CH 3 ) MgCl or methyl group-containing aluminum reagents, in particular trimethylaluminum or dimethylaluminum chloride.
  • methylzinc compounds CH 3 ZnX can also be prepared by reaction of dimethylzinc with a zinc salt ZnX 2 , according to equation a 1 :
  • This manufacturing process is novel. Compared to the production process represented by equation (a), this production process has the advantage of avoiding the loss of methyl groups as methane.
  • the comproportionation of dimethylzinc with the corresponding anhydrous zinc salt, for example, zinc (II) acetate, can also be carried out in situ without isolation of the organylating reagent.
  • the reaction for the preparation of substance class (I) takes place in a one-pot reaction in organic solvents, in coordinating organic solvents such as acetonitrile, 1,2-dimethyloxyethane, Tetrahydrofuran or diethyl ether, non-coordinating solvents such as n-pentane, n-hexane, toluene, methylene chloride, chlorobenzene or in solvent mixtures.
  • the preparation is in donor solvents (eg, tetrahydrofuran, acetonitrile).
  • the reaction temperature varies depending on the starting materials used between -115 and +110 0 C, preferably room temperature (25 0 C).
  • the reaction is preferably carried out in the absence of water.
  • MTO is prepared in the preferred embodiment of the invention from Re 2 O 7 in acetic anhydride, ie from perrhenyl acetate, and a CH 3 Zn (carboxylate) - especially CH 3 Zn (acetate) - preferably at room temperature in acetonitrile as a solvent.
  • Another advantage of the synthesis method according to the invention are the very short reaction times, usually less than one hour compared to several hours in the previously known synthesis methods.
  • Solvents preferably of CH 3 Zn (OAc), for example, in toluene with O 3 Re (OAc), for example, in acetonitrile quantitatively and in the multikilogram scale feasible.
  • OAc CH 3 Zn
  • O 3 Re O 3 Re
  • the cleaning method can be adapted to the specific procedure of production.
  • a perrhenyl compound (II), for example O 3 Re (OAc), with the complex AI (CH 3 ) 3 (THF) at low temperatures in THF, toluene or similar solvents to CH 3 ReO 3 (MTO ) (n 1-3).
  • O 3 Re O 3 Re
  • MTO CH 3 ReO 3
  • the quality of the reagents in particular of the Re 2 O 7 used, has an influence on the purity and yield of the MTO. If CH 3 Zn (OAc) or CH 3 Zn (benzoate) is used as the methylating reagent, it should preferably be added slowly in solution to the rhenium-containing component; otherwise there is a risk of yield reductions.
  • Organylzinkcarboxylate are cheap and even air-hand, unlike the Diorganylzink compounds R 2 Zn non-flammable reagents.
  • the synthesis of organorhenium (VII) oxide may also be carried out without prior isolation of the organylating reagent of formula (III).
  • dirhenium heptoxide in a suitable solvent such as acetonitrile
  • a carboxylic anhydride for example with acetic anhydride.
  • the molar ratio in this step is about 1: 1.
  • the formed O 3 Re-carboxylate, eg O 3 Re-OAc can then be subsequently combined with a solution in which an organylating compound of the formula (III) formed in situ is present.
  • a Methylzinkcarboxylat for example CH 3 ZnOAc
  • a Zinc carboxylate for example of zinc (II) acetate
  • Trimethylaluminum is a very inexpensive methylating agent.
  • the Methylzinkcarboxylat generated according to equation (d), for example methylzinc acetate, can be isolated in bulk in a simple manner, but this is not absolutely necessary.
  • the organorhenium (VII) oxide synthesized by the process according to the invention does not necessarily have to be worked up, but can be further reacted in situ, for example as a solution. So it may in solution on an inorganic support material, such as Al 2 O 3 , Al 2 O 3 ZSiO 2 , SiO 2 or Nb 2 O 5 or mixtures of these oxides are immobilized.
  • an inorganic support material such as Al 2 O 3 , Al 2 O 3 ZSiO 2 , SiO 2 or Nb 2 O 5 or mixtures of these oxides are immobilized.
  • the organorhenium (VII) oxide is preferably used as a catalyst.
  • Preferred areas for industrial use of organorhenium (VII) oxides include MTO-catalyzed olefin epoxidation and MTO-catalyzed aromatic oxidation (Arco Chemicals U.S. Patent 5,166,372; Hoechst AG DE 3,902,357, EP 90 101 439.9).
  • MTO is converted by hydrogen peroxide H 2 O 2 gradually via a mono (peroxo) - into a bis (peroxo) rhenium complex. The latter is the most efficient catalyst for the epoxidation of olefins.
  • organorhenium (VII) oxide may also be used to produce high purity rhenium oxides, e.g. be used by a CVD method (Chemical Vapor Deposition).
  • the dry ice bath is removed and allowed to continue to warm up with vigorous stirring. If the temperature exceeds the range of -30 0 C to -20 0 C, then begins a violent evolution of gas. When this has subsided (usually after 10 minutes at the latest), the reaction mixture is evaporated in an oil pump vacuum. The product is obtained as a pure white solid in almost quantitative yield (2.74 g, 98%). The yields are typically 95-99%.
  • alkyl zinc carboxylates are generally accessible according to 1a) and 1b).
  • the formulations under 1a) and 1b) can be easily increased by a factor of 50-100 or more without reducing the yield. In this case, only suitable laboratory equipment should be used and the reaction times, if appropriate also the solvents, suitably adjusted.
  • Example 8 The production route under Example 7) can be increased by a factor of 100 or more if the equipment required for this purpose is adapted accordingly (glass flask, stirrer, dosing units, solvents, etc.).
  • the work-up of larger amounts of the product CH 3 ReO 3 can alternatively be carried out by Soxhlet extraction, for example with n-pentane.
  • the yields are in the range 75-95%.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

La présente invention concerne un nouveau procédé de production d'oxydes d'organorhenium(VII).
EP05781750A 2004-08-30 2005-08-30 Procede de production efficace de methyltrioxorhenium(vii) (mto) et d'oxydes d'organorhenium(vii) Withdrawn EP1789426A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004041933 2004-08-30
DE102004062246A DE102004062246A1 (de) 2004-08-30 2004-12-23 Verfahren zur effizienten Herstellung von Methyltrioxorhenium(VII) (MTO) und Organorhenium(VII)-oxiden
PCT/EP2005/009336 WO2006024493A1 (fr) 2004-08-30 2005-08-30 Procede de production efficace de methyltrioxorhenium(vii) (mto) et d'oxydes d'organorhenium(vii)

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EP1789426A1 true EP1789426A1 (fr) 2007-05-30

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EP05781750A Withdrawn EP1789426A1 (fr) 2004-08-30 2005-08-30 Procede de production efficace de methyltrioxorhenium(vii) (mto) et d'oxydes d'organorhenium(vii)

Country Status (5)

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US (1) US20080262256A1 (fr)
EP (1) EP1789426A1 (fr)
JP (1) JP2008511571A (fr)
DE (1) DE102004062246A1 (fr)
WO (1) WO2006024493A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009036775A1 (fr) * 2007-09-13 2009-03-26 Süd-Chemie AG Procédé de production d'oxydes de méthyltrioxorhénium et d'organorhénium (vii)
DE102008062687A1 (de) 2008-12-17 2010-07-01 Süd-Chemie AG Verfahren zur Herstellung von Alkyltrioxorhenium
DE102008062686A1 (de) * 2008-12-17 2010-07-01 Süd-Chemie AG Verfahren zur Herstellung von Methyltrioxorhenium (MTO)
BR112013015854B1 (pt) * 2010-12-22 2019-07-02 Ludwig-Maximilians-Universistät München Processos para produzir reagentes de organozinco e compostos orgânicos, composição de reagentes de organozinco e complexo de coordenação de zinco

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Publication number Priority date Publication date Assignee Title
US5342985A (en) * 1988-12-10 1994-08-30 Hoechst Ag Organic derivatives of rhenium oxides and their preparation and use for the metathesis of olefins
DE19717178A1 (de) * 1997-04-24 1998-10-29 Hoechst Ag Direktsynthese von Organorhenium(VII)oxiden aus rheniumhaltigen Verbindungen
DE19717176A1 (de) * 1997-04-24 1998-10-29 Hoechst Ag Verfahren zur katalytischen und selektiven aromatischer Verbindungen

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Title
See references of WO2006024493A1 *

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JP2008511571A (ja) 2008-04-17
DE102004062246A1 (de) 2006-03-02
US20080262256A1 (en) 2008-10-23
WO2006024493A1 (fr) 2006-03-09

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