EP 1178945 A1 20020213 - REACTIONS USING LEWIS ACIDS
Title (en)
REACTIONS USING LEWIS ACIDS
Title (de)
REAKTIONEN UNTER VERWENDUNG VON LEWIS-SÄUREN
Title (fr)
REACTIONS UTILISANT LES ACIDES DE LEWIS
Publication
Application
Priority
- EP 00927561 A 20000511
- EP 99303812 A 19990517
- GB 0001793 W 20000511
Abstract (en)
[origin: EP1053974A1] In a method of performing a chemical reaction using a Lewis acid, after reaction the Lewis acid is extracted from the reaction product in the form of an aqueous solution, followed by drying of the aqueous solution of the Lewis acid. The dried Lewis acid can be reused in a further similar reaction. The method can be repeated several times, using the same batch of Lewis acid, without the activity and specificity of the Lewis acid being significantly affected. The invention has been used to good effect in the preparation of isopulegol from citronellal using zinc bromide as a Lewis acid catalyst for the cyclisation reaction. The invention can thus provide an environmentally acceptable and efficient process for the production of isopulegol from citronellal, in both racemic and enantiomerically pure forms.
IPC 1-7
IPC 8 full level
C01G 9/00 (2006.01); C01G 9/04 (2006.01); C07B 53/00 (2006.01); C07B 61/00 (2006.01); C07B 63/00 (2006.01); C07C 29/17 (2006.01); C07C 29/56 (2006.01); C07C 35/08 (2006.01); C07C 35/12 (2006.01); C07C 45/69 (2006.01); C07C 47/225 (2006.01); C07C 49/557 (2006.01)
CPC (source: EP)
C01G 9/003 (2013.01); C01G 9/04 (2013.01); C07B 63/00 (2013.01); C07C 29/172 (2013.01); C07C 29/56 (2013.01); C07C 2601/14 (2017.04)
Citation (search report)
See references of WO 0069777A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 1053974 A1 20001122; AU 4595300 A 20001205; EP 1178945 A1 20020213; JP 2002544245 A 20021224; MX PA01011259 A 20020301; WO 0069777 A1 20001123; ZA 200109303 B 20021112
DOCDB simple family (application)
EP 99303812 A 19990517; AU 4595300 A 20000511; EP 00927561 A 20000511; GB 0001793 W 20000511; JP 2000618201 A 20000511; MX PA01011259 A 20011106; ZA 200109303 A 20011112