EP 1697317 A1 20060906 - METHOD FOR PRODUCING VITAMIN A ACETATE
Title (en)
METHOD FOR PRODUCING VITAMIN A ACETATE
Title (de)
VERFAHREN ZUR HERSTELLUNG VON VITAMIN A- ACETAT
Title (fr)
PROCEDE POUR PRODUIRE DE L'ACETATE DE VITAMINE A
Publication
Application
Priority
- EP 2004014209 W 20041214
- DE 10359433 A 20031217
Abstract (en)
[origin: WO2005058811A1] The invention relates to a method for producing vitamin A acetate by reacting beta -vinyl ionol with triphenylphosphine in the presence of sulphuric acid in a solvent mixture consisting of between 60 and 80 % methanol, between 10 and 20 % water and between 10 and 20 wt. % aliphatic, cyclic or aromatic hydrocarbons with between 5 and 8 atoms, in order to obtain beta -ionylidene ethyltriphenyl phosphonium salts and then by a subsequent Wittig reaction using 4-acetoxy-2-methyl-but-2-enal.
IPC 8 full level
C07C 403/20 (2006.01); C07B 61/00 (2006.01); C07C 1/34 (2006.01); C07C 67/293 (2006.01); C07C 403/12 (2006.01)
CPC (source: EP US)
C07C 403/12 (2013.01 - EP US); C07C 2601/16 (2017.04 - EP US)
Citation (search report)
See references of WO 2005058811A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005058811 A1 20050630; CA 2546307 A1 20050630; CN 100455558 C 20090128; CN 1894208 A 20070110; DE 10359433 A1 20050721; EP 1697317 A1 20060906; JP 2007514681 A 20070607; US 2007082950 A1 20070412; US 2009043121 A1 20090212
DOCDB simple family (application)
EP 2004014209 W 20041214; CA 2546307 A 20041214; CN 200480037627 A 20041214; DE 10359433 A 20031217; EP 04803835 A 20041214; JP 2006544308 A 20041214; US 25546008 A 20081021; US 58095804 A 20041214