Process for preparing dibenzylidenesorbitol and composition cont

Details Process for preparing dibenzylidenesorbitol and composition cont Process for preparing dibenzylidenesorbitol and composition cont

1979-08-29

1981-05-12

Love, Ethel G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 304R, C07D31904

Patent

active

042671108

ABSTRACT:
In a process for preparing dibenzylidenesorbitol by dehydrocondensation of 1 mol of sorbitol with 2 mols of benzaldehyde in the presence of an acid catalyst, the improvement in which the reaction is carried out in two stages, the first-stage reaction comprising reacting the reactants with heating at a temperature of 50.degree. to 70.degree. C., the first-stage reaction being shifted to the second-stage reaction by adding water and an additional amount of an acid catalyst when the conversion of sorbitol to dibenzylidenesorbitol reaches 10 to 40%, and the second-stage reaction comprising of reacting the mixture in the suspended state at ordinary temperature in 2.5 or more parts by weight, per part by weight of sorbitol, of an aqueous reaction medium, and the resulting dibenzylidenesorbitol is obtained as an aqueous suspension.

REFERENCES:
patent: 3721682 (1973-03-01), Murai et al.
patent: 4031112 (1977-06-01), Oppenlaender et al.
Chem. Abstracts 84:P45604a.
Chem. Abstracts 86:173395m.

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