Method for the production of isopulegol

Details Method for the production of isopulegol Method for the production of isopulegol

2005-12-17

2009-06-23

Witherspoon, Sikarl A (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S830000, C568S834000

Reexamination Certificate

active

07550633

ABSTRACT:
The present invention relates to a process for the preparation of isopulegol of formula (I):comprising the cyclization of citronellal of formula (II):in the presence of a tris(aryloxy)aluminum catalyst, wherein the cyclization is carried out in the presence ofI. at least one acid and/orII. at least one compound selected from the group comprising carboxylic anhydrides, aldehydes, ketones and vinyl ethers.

REFERENCES:
patent: 6774269 (2004-08-01), Iwata et al.
patent: 2002/0133046 (2002-09-01), Iwata et al.
patent: 0926117 (1999-06-01), None
patent: 1053974 (2000-11-01), None
patent: 1225163 (2002-07-01), None
patent: WO-2004/092099 (2004-10-01), None
patent: WO-2004/101480 (2004-11-01), None

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