Process for preparation of diacetal compounds

Details Process for preparation of diacetal compounds Process for preparation of diacetal compounds

1990-09-26

1992-06-09

Ivy, C. Warren

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549362, C07D32304

Patent

active

051208636

ABSTRACT:
Disclosed is a process for preparing a diacetal compound such as a dibenzylidene sorbitol, comprising the steps of (i) condensing an aldehyde compound and a polyhydric alcohol in the presence of an acid catalyst and when required a lower alcohol in a hydrophobic organic solvent to give a reaction mixture containing a diacetal compound, (ii) neutralizing the reaction mixture, (iii) washing the mixture with water, (iv) removing the solvent from the mixture thus washed, and (v) drying the residual mass; the process being characterized in that an amine such as, for example, di(C.sub.10 -C.sub.26 alkyl or alkenyl)amine substituted on the nitrogen atom with a C.sub.1 -C.sub.4 alkyl group or with a group of the formula --C.sub.2 H.sub.4 O).sub.q H wherein q is an integer of 1 to 4, or a (C.sub.14 -C.sub.22 alkyl or alkenyl)amine sustituted on the nitrogen atom with one or two groups of the formula --C.sub.2 H.sub.4 O).sub.q H wherein q is 1 to 4, is added during the period from the formation of the reaction mixture to the completion of the drying step.

REFERENCES:
patent: 4444766 (1984-04-01), Bossies et al.
patent: 4459418 (1984-07-01), Greenshields
patent: 4562265 (1985-12-01), Machell
patent: 4804769 (1989-02-01), Solarek et al.
patent: 4902807 (1990-02-01), Kobayashi et al.

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