Preparation of citraconic anhydride  

  Bibliographic data     Description     Claims     Mosaics     Original document     INPADOC legal status  

Publication number: US5670659 (A)
Publication date: 1997-09-23
Inventor(s): ALAS MICHEL [FR]; SIGISMONDI ALAIN [FR]; TIREL PHILIPPE-JEAN [FR]
Applicant(s): RHONE POULENC CHIMIE [FR]
Classification:  
- international: C07D307/60; B01J31/02; C07B61/00; C07C51/56; C07D307/00; B01J31/02; C07B61/00; C07C51/54; (IPC1-7): C07D307/60
- European: C07C51/56
Application number: US19950380722 19950130 
Priority number(s): FR19940000938 19940128
   
View INPADOC patent family  
View list of citing documents  
Also published as:
  EP0665211  (A1)  
  EP0665211  (B1)  
  JP7247277  (A)  
  FR2715656  (A1)  
  CN1110676  (A)  
 
Cited documents:
  US3833619 (A)  
  US4639531 (A)  
  EP0495544 (A1)  
Report a data error here   
Abstract of US 5670659  (A)
Citraconic anhydride is prepared in a single step by heating itaconic acid, optionally in an inert organic solvent medium, in the presence of a catalytically effective amount of an at least partially organic acid/base catalyst compound having a pKa ranging from 4 to 10, in particular a salt catalyst such as pyridinium tosylate, itaconate or hydrochloride, ammonium itaconate, or phosphinium hydrobromide.

Data supplied from the esp@cenet database — Worldwide