| abstract |
One object of the invention is to provide a method for preparing a 9,9-dialkoxy-7-nonynoate ester and (7E)-7,9-decadienoate ester, which are valuable as intermediates. The method for preparing a (7E)-7,9-decadienoate ester (5) comprises at least steps of: hydrolyzing a 9,9-dialkoxy-7-nonenoate ester (2), R 3 O(R 2 O)CHCH═CH(CH 2 ) 5 CO 2 R 1 , to form a (7E)-9-oxo-7-nonenoate ester (3); and subjecting the (7E)-9-oxo-7-nonenoate ester (3) to a Wittig reaction with a triarylphosphonium methylide (4), Ar 3 P═CH 2 , to form the (7E)-7,9-decadienoate ester (5). The 9,9-dialkoxy-7-nonenoate ester may be prepared by, for example, reducing a 9,9-dialkoxy-7-nonynoate ester (1). |