Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
September 8, 2009
Patent Application Number
10561031
Date Filed
June 18, 2004
Patent Primary Examiner
Patent abstract
The present invention relates to a three-step method for the preparation of alkyl esters of 4,4-difluoroacetoacetic acid in which in the first step alkyl esters of 4-chloro-4,4-difluoroacetic acid are reacted with trialkylphosphites of formula (III)P(OR1)3 (III)in which R1 stands for C1-C4-alkyl, whereby the residues R1 can in each case be the same or different,to form alkyl phosphonates of formula (IV)
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