| 54 |
Title |
TI |
[DE] Verfahren zur Herstellung von Cyclopropylmethylketon.
[EN] Process for the production of cyclopropylmethylketone.
[FR] Procédé pour la préparation de cyclopropylméthylkétone. |
| 71/73 |
Applicant/owner |
PA |
CIBA GEIGY AG, CH
|
| 72 |
Inventor |
IN |
HUNSTON ROGER DR, CH
;
WADITSCHATKA RUDOLF DR, CH
|
| 22/96 |
Application date |
AD |
Nov 10, 1992 |
| 21 |
Application number |
AN |
92810872 |
|
Country of application |
AC |
EP |
|
Publication date |
PUB |
Jul 28, 1993 |
33
31
32 |
Priority data |
PRC
PRN
PRD |
US
79453691
19911119
|
| 51 |
IPC main class |
ICM |
C07C 45/67
|
| 51 |
IPC secondary class |
ICS |
C07C 49/293
|
|
IPC additional class |
ICA |
|
|
IPC index class |
ICI |
|
|
Cooperative patent classification |
CPC |
C07C 41/22
C07C 45/676
|
|
MCD main class |
MCM |
C07C 45/59
(2006.01)
|
|
MCD secondary class |
MCS |
C07C 45/67
(2006.01)
C07C 49/293
(2006.01)
|
|
MCD additional class |
MCA |
|
| 57 |
Abstract |
AB |
[EN] A process is described for the production of the known intermediate cyclopropylmethyl-ketone which delivers a high yield, few side products, high reaction efficiency and turnover, and is more viable practically and commercially. In the presence of an excess of a Periodic Table Group I or Group II metal halide or quaternary phosphonium halide, alpha -acetyl- gamma -butyrolactone is led continuously into a reaction vessel at 170-200 DEG C and cyclopropylmethylketone distilled off continuously. The halide is recovered and recycled in the process. |
| 56 |
Cited documents identified in the search |
CT |
|
| 56 |
Cited documents indicated by the applicant |
CT |
|
| 56 |
Cited non-patent literature identified in the search |
CTNP |
CHEMICAL ABSTRACTS, vol. 84 Columbus, Ohio, US; abstract no. 105042, TAKEI S ET AL. 'Novel synthesis of cyclopropyl ketones by decarboxylative ring contractions of .alpha.-acyl-.gamma.-butyrolactones catalyzed by halide ions in dipolar aprotic solvents' 0;
CHEMICAL ABSTRACTS, vol. 84 Columbus, Ohio, US; abstract no. 16711, ASAOKA M ET AL. 'Alkylation reaction accompanied by dealkoxycarbonylation of .beta.-keto esters, geminal diesters, and .alpha.-cyano ester in hexamethylphosphoric triamide (HMPA)' 0;
CHEMICAL ABSTRACTS, vol. 86, Columbus, Ohio, US; abstract no. 55055, TAKEI S ET AL: "Acylcyclopropanes" 0
|
| 56 |
Cited non-patent literature indicated by the applicant |
CTNP |
|
|
Citing documents |
|
Determine documents
|
|
Sequence listings |
|
|
|
Search file IPC |
ICP |
C07C 49/293
|
