CH491092A - Process for the production of new organic fluorine compounds - Google Patents
Process for the production of new organic fluorine compoundsInfo
- Publication number
- CH491092A CH491092A CH429270A CH429270A CH491092A CH 491092 A CH491092 A CH 491092A CH 429270 A CH429270 A CH 429270A CH 429270 A CH429270 A CH 429270A CH 491092 A CH491092 A CH 491092A
- Authority
- CH
- Switzerland
- Prior art keywords
- formula
- fluorine compounds
- organic fluorine
- production
- new organic
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 4
- 150000004812 organic fluorine compounds Chemical class 0.000 title claims description 4
- 239000000126 substance Substances 0.000 claims description 9
- 150000001450 anions Chemical class 0.000 claims description 5
- 150000001298 alcohols Chemical class 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 229910052731 fluorine Chemical group 0.000 claims description 3
- 125000001153 fluoro group Chemical group F* 0.000 claims description 3
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 2
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 11
- 239000000203 mixture Substances 0.000 description 5
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- -1 p-toluenesulfonic acid ester Chemical class 0.000 description 3
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 3
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- AUCGUGJYVNQWFH-UHFFFAOYSA-N 1-(dimethylamino)ethanesulfonic acid Chemical compound CN(C)C(C)S(O)(=O)=O AUCGUGJYVNQWFH-UHFFFAOYSA-N 0.000 description 1
- UTWROBRGEAAFCM-UHFFFAOYSA-N 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctyl ethenesulfonate Chemical compound C(=C)S(=O)(=O)OCC(C(C(C(C(C(C(F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)F UTWROBRGEAAFCM-UHFFFAOYSA-N 0.000 description 1
- BMYNFMYTOJXKLE-UHFFFAOYSA-N 3-azaniumyl-2-hydroxypropanoate Chemical compound NCC(O)C(O)=O BMYNFMYTOJXKLE-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- LYXFCGCYJQCSRL-UHFFFAOYSA-N OOSO Chemical compound OOSO LYXFCGCYJQCSRL-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 229940022682 acetone Drugs 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 150000001350 alkyl halides Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- LDXZHJKKTXWETH-UHFFFAOYSA-N chloroethane;sulfurochloridic acid Chemical compound CCCl.OS(Cl)(=O)=O LDXZHJKKTXWETH-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 150000008050 dialkyl sulfates Chemical class 0.000 description 1
- VAYGXNSJCAHWJZ-UHFFFAOYSA-N dimethyl sulfate Chemical compound COS(=O)(=O)OC VAYGXNSJCAHWJZ-UHFFFAOYSA-N 0.000 description 1
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- CCIVGXIOQKPBKL-UHFFFAOYSA-M ethanesulfonate Chemical compound CCS([O-])(=O)=O CCIVGXIOQKPBKL-UHFFFAOYSA-M 0.000 description 1
- 229960003750 ethyl chloride Drugs 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229960004592 isopropanol Drugs 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- JZMJDSHXVKJFKW-UHFFFAOYSA-N methyl sulfate Chemical compound COS(O)(=O)=O JZMJDSHXVKJFKW-UHFFFAOYSA-N 0.000 description 1
- 229940032007 methylethyl ketone Drugs 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- XTHPWXDJESJLNJ-UHFFFAOYSA-N sulfurochloridic acid Chemical compound OS(Cl)(=O)=O XTHPWXDJESJLNJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/244—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus
- D06M13/248—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus with compounds containing sulfur
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung von neuen organischen Fluorverbindungen Es wurden neue organische Fluorverbindungen gefunden, die der Formel
EMI0001.0003
entsprechen. In dieser Formel bedeuten R1 ein Was serstoff- oder Fluoratom, R:2, R:3 und R, niedermoleku lare Alkylgruppen oder Benzylgruppen, n eine ganze Zahl von 7 bis 11 und X o den einer negativen Ladung entsprechenden Teil eines Anions.
Die niedermolekularen Alkylgruppen R2 bis R4 sind vorzugsweise solche mit bis zu 4 Kohlenstoffatomen, wie insbesondere Methyl- und Äthylgruppen. Auch sind diejenigen Stoffe der Formel 1 von besonderer techni scher Bedeutung, in denen der Rest R1 ein Fluor atom ist. Als Anionen, deren einer negativen Ladung entsprechender Teil in der Formel I mit X o bezeichnet ist, kommen an sich beliebige Anionen anorganischer oder organischer Säuren in Betracht.
Vorzugsweise han delt es sich um Anionen starker oder mittelstarker Säuren, d. h. um Säuren mit einer Dissoziationskon- stanten bzw. einer ersten Dissoziationskonstanten über 10-4, wie Salzsäure, Bromwasserstoffsäure, Schwefel säure, Methylschwefelsäure, Salpetersäure, Phosphor säure und p-Toluolsulfonsäure.
Die Stoffe der Formel 1 werden erfindungsgemäss hergestellt, indem man einen Vinylsulfonsäureester eines fluorierten Alkohols der Formel Rl-(CFZ)n CHr0-SOrCH=CH2 (Il), der beispielsweise aus dem zugrunde liegenden Alkohol durch Umsetzung mit ss-Chloräthansulfochlorid in wässrig-alkalischem Medium, zweckmässig in Gegenwart eines indifferenten organischen Lösungsmittels erhält lich ist, mit einem Amin der Formel
EMI0001.0031
umsetzt, und in den entstandenen Stoff der Formel
EMI0001.0032
den Rest R, mit einem Quaternierungsmittel, bei spielsweise einem niedermolekularen Alkylhalogenid,
einem niedermolekularen Dialkylsulfat, einem nieder molekularen p-Toluolsulfonsäureester oder einem Ben- zylhalogenid, einführt. Diese Umsetzungen können bei gewöhnlicher oder leicht erhöhter Temperatur beispiels weise bei 15 bis 45 C in Abwesenheit oder Anwesen heit organischer Lösungsmittel durchgeführt werden. Die Stoffe der Formel 1 sind in reiner Form farblose, kristallisierte Substanzen mit definiertem Schmelzpunkt. Sie sind oberflächenaktive Stoffe, die unter schwach alkalischen Bedingungen die quaternäre Ammonium gruppe abspalten und dabei ihre Oberflächenaktivität verlieren.
Die Stoffe der Formel I lassen sich sehr gut als Mittel zum Oleophobieren von Oberflächen verwenden. Sie können dazu in Form ihrer Lösungen insbesondere derjenigen in Gemischen aus Wasser und mit Wasser mischbaren organischen Lösungsmitteln, wie Aceton, iso-Propanol und Methyl-äthyl-keton auf die zu be handelnden Oberflächen aufgebracht werden. Dafür können einzelne Stoffe der Formel I oder auch Mi schungen mehrerer solcher Stoffe eingesetzt werden. Derartige Mischungen entstehen beispielsweise aus den im Handel erhältlichen Mischungen hochfluorierter Al kohole, die Komponenten mit 8 bis 12 Kohlenstoff atomen enthalten.
Nach dem Trocknen der Lösungen, das bei gewöhnlicher oder erhöhter Temperatur bis zu 100 C durchgeführt werden kann, sind die Oberflä chen oleophobiert.
Die in den Beispielen genannten Teile und Prozente sind Gewichtseinheiten.
<I>Beispiel 1</I> In einem Rührgefäss werden 311 Teile Vinylsulfon- säureeikosofluorundecylester der Formel CH2=CH-SO2-O-CHj--(CF#-,)1o-H, welcher in bekannter Weise aus Eikosofluor-undecanol und r-Chloräthansulfochlorid in wässriger Natriumhy- droxidlösung in Gegenwart von Äthylenchlorid herge- stellt worden ist, in 500 Teilen Äthylenchlorid ge löst.
Bei Raumtemperatur leitet man 25 Teile Dimethyl- amin aus einer Druckflasche unter die Oberfläche dieser Lösung ein. Man rührt nach, bis eine durch Abziehen des Lösungsmittels im Vakuum isolierte Probe kein n-Dodecylmercaptan mehr bindet (Bestimmung gemäss Anal. Chem. 21,<B>1073</B> (1949)). Dann wäscht man drei mal mit Wasser das überschüssige Dimethylamin aus, trocknet über wasserfreiem Natriumsulfat und zieht nach dem Filtrieren das Lösungsmittel im Vakuum bei leicht erhöhter Temperatur ab.
Es hinterbleiben 310 Teile Dimethylaminoäthansulfonsäure-eikosofluor- undecylester als gelbes Öl. Dieser Ester wird, in 300 Teilen Aceton gelöst, zu einer Lösung von 58,5 Tei len Dimethylsulfat in 300 Teilen Aceton im Verlauf von 2 bis 3 Stunden unter gutem Rühren bei 20 bis 25 C unter leichtem Kühlen zugegeben. Man rührt etwa eine Stunde bei dieser Temperatur nach, kühlt dann auf 0 C ab, saugt den Kristallbrei über eine Nutsche ab und wäscht mit kaltem Aceton nach.
Nach dem Trocknen erhält man 278 Teile N-Trimethyl-ammonium-äthansulfonsäure- eikosofluor-undecylester-methosulfat als farblose Kristalle vom Fp. <B>123'</B> C.
EMI0002.0030
Beispiel <I>2</I> Die Vorschrift des Beispiels 1 wird wiederholt mit lem einzigen Unterschied, dass als Ausgangsstoff 245 Teile Vinylsulfonsäurepentadecafluor-octylester der For- mel CH,=CH-SOz-O-CHr(CF2)7-F verwendet werden.
Man erhält 251 Teile N-Trimethylammonium-äthansul- fonsäure-pentadecafluor-octylester-methosulfat der For mel <B>CH,</B> F-(CF2)7-CH2-O-S02CHPCH2i-CH3 OOSO,OCH3 C H3 als farblose Kristalle vom Fp. 121-122 C nach ein maligem Umlösen aus Aceton.
Process for the preparation of new organic fluorine compounds New organic fluorine compounds have been found which have the formula
EMI0001.0003
correspond. In this formula, R1 is a hydrogen or fluorine atom, R: 2, R: 3 and R, low molecular weight alkyl groups or benzyl groups, n is an integer from 7 to 11 and X is the part of an anion corresponding to a negative charge.
The low molecular weight alkyl groups R2 to R4 are preferably those with up to 4 carbon atoms, such as, in particular, methyl and ethyl groups. Those substances of formula 1 are of particular technical importance in which the radical R1 is a fluorine atom. Any anions of inorganic or organic acids can be considered as anions, the part of which corresponds to a negative charge in the formula I with X o.
They are preferably anions of strong or moderately strong acids; H. to acids with a dissociation constant or a first dissociation constant above 10-4, such as hydrochloric acid, hydrobromic acid, sulfuric acid, methylsulfuric acid, nitric acid, phosphoric acid and p-toluenesulfonic acid.
The substances of formula 1 are prepared according to the invention by converting a vinyl sulfonic acid ester of a fluorinated alcohol of the formula Rl- (CFZ) n CHr0-SOrCH = CH2 (II), for example from the alcohol on which it is based, by reaction with β-chloroethane sulfochloride in aqueous alkaline Medium, conveniently available in the presence of an inert organic solvent, with an amine of the formula
EMI0001.0031
converts, and into the resulting substance of the formula
EMI0001.0032
the radical R, with a quaternizing agent, for example a low molecular weight alkyl halide,
a low molecular weight dialkyl sulfate, a low molecular weight p-toluenesulfonic acid ester or a benzyl halide. These reactions can be carried out at an ordinary or slightly elevated temperature, for example at 15 to 45 C in the absence or presence of organic solvents. The substances of formula 1 are colorless, crystallized substances with a defined melting point in their pure form. They are surface-active substances that split off the quaternary ammonium group under weakly alkaline conditions and thereby lose their surface activity.
The substances of the formula I can be used very well as agents for the oleophobic treatment of surfaces. For this purpose, they can be applied to the surfaces to be treated in the form of their solutions, in particular those in mixtures of water and water-miscible organic solvents such as acetone, iso-propanol and methyl-ethyl-ketone. For this purpose, individual substances of the formula I or mixtures of several such substances can be used. Such mixtures arise, for example, from the commercially available mixtures of highly fluorinated alcohols containing components with 8 to 12 carbon atoms.
After the solutions have dried, which can be carried out at normal or elevated temperatures of up to 100 ° C., the surfaces are oleophobic.
The parts and percentages given in the examples are weight units.
<I> Example 1 </I> In a stirred vessel, 311 parts of vinylsulfonic acid eikosofluorundecyl ester of the formula CH2 = CH-SO2-O-CHj - (CF # -,) 1o-H, which in a known manner from eikosofluorundecanol and r-chloroethane sulfochloride has been prepared in aqueous sodium hydroxide solution in the presence of ethylene chloride, dissolved in 500 parts of ethylene chloride.
At room temperature, 25 parts of dimethylamine are introduced from a pressure bottle under the surface of this solution. Stirring is continued until a sample isolated by stripping off the solvent in vacuo no longer binds n-dodecyl mercaptan (determination according to Anal. Chem. 21, 1073 (1949)). The excess dimethylamine is then washed three times with water, dried over anhydrous sodium sulfate and, after filtration, the solvent is removed in vacuo at a slightly elevated temperature.
310 parts of dimethylaminoethanesulfonic acid eikosofluorundecyl ester remain as a yellow oil. This ester, dissolved in 300 parts of acetone, is added to a solution of 58.5 Tei len dimethyl sulfate in 300 parts of acetone over the course of 2 to 3 hours with thorough stirring at 20 to 25 ° C. with slight cooling. The mixture is stirred for about an hour at this temperature, then cooled to 0 C, the crystal sludge is suctioned off through a suction filter and washed with cold acetone.
After drying, 278 parts of N-trimethylammonium ethanesulfonic acid eikosofluorundecyl ester methosulfate are obtained as colorless crystals with a melting point of 123 ° C.
EMI0002.0030
Example <I> 2 </I> The procedure of Example 1 is repeated with the only difference that 245 parts of vinylsulfonic acid pentadecafluoro-octyl ester of the formula CH, = CH-SO2-O-CHr (CF2) 7-F are used as the starting material will.
251 parts of N-trimethylammonium-ethanesulfonic acid-pentadecafluoro-octyl ester-methosulfate of the formula CH, F- (CF2) 7-CH2-O-SO2CHPCH2i-CH3 OOSO, OCH3 C H3 are obtained as colorless Crystals with a melting point of 121-122 ° C. after being dissolved once from acetone.
Claims (1)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB0095052 | 1967-10-20 | ||
DE19671643254 DE1643254A1 (en) | 1967-10-20 | 1967-10-20 | New organic fluorine compounds and their use as oil repellants |
CH1561968A CH508775A (en) | 1967-10-20 | 1968-10-18 | Process for the production of a wash-resistant oleophobic finish for textile fibers |
Publications (2)
Publication Number | Publication Date |
---|---|
CH429270A4 CH429270A4 (en) | 1970-07-15 |
CH491092A true CH491092A (en) | 1970-07-15 |
Family
ID=25754053
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH429270A CH491092A (en) | 1967-10-20 | 1968-10-18 | Process for the production of new organic fluorine compounds |
CH1561968A CH508775A (en) | 1967-10-20 | 1968-10-18 | Process for the production of a wash-resistant oleophobic finish for textile fibers |
CH1561968D CH1561968A4 (en) | 1967-10-20 | 1968-10-18 |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH1561968A CH508775A (en) | 1967-10-20 | 1968-10-18 | Process for the production of a wash-resistant oleophobic finish for textile fibers |
CH1561968D CH1561968A4 (en) | 1967-10-20 | 1968-10-18 |
Country Status (6)
Country | Link |
---|---|
BE (2) | BE722549A (en) |
CH (3) | CH491092A (en) |
DE (1) | DE1643254A1 (en) |
FR (1) | FR1589274A (en) |
GB (1) | GB1245273A (en) |
NL (1) | NL6814886A (en) |
-
1967
- 1967-10-20 DE DE19671643254 patent/DE1643254A1/en active Pending
-
1968
- 1968-10-11 FR FR1589274D patent/FR1589274A/fr not_active Expired
- 1968-10-17 NL NL6814886A patent/NL6814886A/xx unknown
- 1968-10-18 GB GB4954068A patent/GB1245273A/en not_active Expired
- 1968-10-18 CH CH429270A patent/CH491092A/en not_active IP Right Cessation
- 1968-10-18 CH CH1561968A patent/CH508775A/en not_active IP Right Cessation
- 1968-10-18 CH CH1561968D patent/CH1561968A4/xx unknown
- 1968-10-18 BE BE722549D patent/BE722549A/xx not_active IP Right Cessation
- 1968-10-18 BE BE722550D patent/BE722550A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
CH508775A (en) | 1971-06-15 |
NL6814886A (en) | 1969-04-22 |
BE722549A (en) | 1969-04-18 |
CH429270A4 (en) | 1970-07-15 |
DE1643254A1 (en) | 1971-06-09 |
FR1589274A (en) | 1970-03-23 |
GB1245273A (en) | 1971-09-08 |
BE722550A (en) | 1969-04-18 |
CH1561968A4 (en) | 1971-02-15 |
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Legal Events
Date | Code | Title | Description |
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PL | Patent ceased |