Title:
MANUFACTURE OF SUBSTITUTED BENZALDEHYDE* NOVEL INTERMEDIATE THEREFOR AND MANUFACTURE
Document Type and Number:
Japanese Patent JPS5630939
Kind Code:
A
Abstract:
1. Process for the preparation of alpha-hydroxybenzylphosphonic acid esters of the formula (II) see diagramm : EP0049911,P5,F1 in which R**1 represents hydrogen or halogen, R**2 represents halogen or optionally halogen-substituted phenoxy and the radicals R**3 individually represent alkyl or phenyl or together represent alkanediyl, by reacting benzoylphosphonic acid esters of the formula (III) see diagramm : EP0049911,P5,F3 in which R**1 -R**3 have the meaning indicated above, with sodium hydridoborate or potassium hydridoborate, if appropriate in the presence of a buffer at temperatures of -20 to +50 degrees C, which process is characterised in that per mol of benzoylphosphonic esters of the formula (II) 0.2 to 0.5 mol of hydride are used and the reaction is carried out in a two-phase mixture of water and a water-immiscible solvent.
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Inventors:
HERUMUUTO HOFUMAN
Application Number:
JP11355180A
Publication Date:
March 28, 1981
Filing Date:
August 20, 1980
Export Citation:
Assignee:
BAYER AG
International Classes:
C07C45/00; C07C45/51; C07C45/54; C07C45/55; C07C47/55; C07C47/575; C07C67/00; C07F9/40; (IPC1-7): C07C45/29; C07C47/52; C07F9/40