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Patent Searching and Data


Title:
PREPARATION OF SUGAR KETAL
Document Type and Number:
Japanese Patent JPS5855494
Kind Code:
A
Abstract:

PURPOSE: To obtain the titled compound useful as a synthetic intermediate, etc. industrially advantageously without requiring complicated after-treatment with suppressing side reactions such as self condensation of ketone, etc., by reacting a sugar with a ketone in the presence of a cupric chloride or cupric bromide.

CONSTITUTION: A sugar (e.g., D-arabinose, etc.) is reacted with a ketone (e.g., cyclohexanone, etc.) in a solvent such as dichloromethane, etc. in the presence of anhydrous cupric chloride at 0W150°C, preferably 20W100°C for 30minW10hr. Molecular Sieves is set between a reactor and a cooling pipe in the reaction, and the refluxed solvent is continuously dried. After the reaction is over, the reaction solution is diluted with the solvent, washed with an aqueous solution of sodium bicarbonate, and then water, dried, and the solvent and unreacted ketone are distilled away under reduced pressure, to give the desired compound.


Inventors:
Matsumura, Koichi
Aono, Tetsuya
Application Number:
JP1981000155071
Publication Date:
April 01, 1983
Filing Date:
September 29, 1981
Export Citation:
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Assignee:
TAKEDA CHEM IND LTD
International Classes:
C07H9/04; B01J23/00; B01J23/72; C07B61/00; (IPC1-7): B01J23/72; C07H9/04