The monomethyl ester of azelaic acid was transformed into two fragment
s, namely [8-(methoxycarbonyl)octyl]triphenylphosphonium bromide and m
ethyl 9-oxononanoate. A Wittig reaction between these two fragments pr
oduced dimethyl (Z)-octadec-9-enedioate and subsequent hydrolysis gave
the title diacid. Interestingly, the same diacid was available direct
ly from oleic acid in a published procedure which utilized a mutant st
rain of Candida tropicalis.