Process for making intermediates for fragrance components...

Details Process for making intermediates for fragrance components... Process for making intermediates for fragrance components...

2007-08-28

2007-08-28

Witherspoon, Sikarl A. (Department: 1621)

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

Organic compounds

Oxygen containing

C568S341000

Reexamination Certificate

active

11604431

ABSTRACT:
A two-step aldol condensation process is disclosed. α-Campholenic aldehyde (ACA) and methyl ethyl ketone (MEK) react in the presence of a base under conditions effective to produce a mixture comprising a high yield of ketol condensation products. Dehydration of the ketols in the presence of an organic sulfonic acid provides unsaturated ketones that are valuable intermediates for fragrance components for synthetic sandalwood products. Compared with the usual one-step, base-catalyzed approach, the two-step process increases the yield of all condensation products and maximizes production of the most valuable ketone isomers.

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patent: 4696766 (1987-09-01), Naipawer
patent: 5840992 (1998-11-01), Kido et al.
patent: 6833481 (2004-12-01), Yamamoto et al.
C. Cardenas and B. Kane, “Rearrangement of α-Campholenic Aldehyde,” InProceedings of 11th ICEOFF, New Delhi, 12-16, Nov. 1989, pp. 37-41.

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