Process for preparing dibenzylidene-D-sorbitol compounds

Details Process for preparing dibenzylidene-D-sorbitol compounds Process for preparing dibenzylidene-D-sorbitol compounds

1990-06-26

1992-04-21

Chan, Nicky

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31904

Patent

active

051069997

ABSTRACT:
A process for preparing dibenzylidene-D-sorbitol compounds, particularly meta substituted halogenated derivatives, by reacting D-sorbitol with an aromatic aldehyde, particularly those substituted at the 3 position with a halogen, in the presence of an acid catalyst, and a C.sub.1 -C.sub.3 aliphatic alcohol reaction medium. The resulting product is purified by subsequent washings with a C.sub.1 -C.sub.3 aliphatic alcohol. Higher yields of the product, shorter reaction times, and simplified removal of impurities may be realized using this invention.

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patent: 4518582 (1985-05-01), Schamper et al.
patent: 4562265 (1985-12-01), Machell
patent: 4743444 (1988-05-01), McCall
patent: 4816261 (1989-03-01), Luebbe et al.

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