The methoxycarbonylation of aryl chlorides catalysed by palladium complexes of bis(di-tert-butylphosphinomethyl)benzene
作者:Cristina Jimenez-Rodriguez、Graham R. Eastham、David. J. Cole-Hamilton
DOI:10.1039/b501868d
日期:——
A catalyst system based on palladium-1,2-bis-(di-tert-butylphosphinomethyl)benzene (BDTBPMB) shows good activity for the methoxycarbonylation of strongly activated aryl chlorides, like 4-chloromethylbenzoate or 4-chlorocyanobenzene. Surprisingly, the use of less activated aryl chlorides, like 4-chloroacetophenone, leads to the formation of dimethyl terephthalate amongst other products arising from
The present invention provides a method for producing a compound represented by the formula (3):
wherein n is an integer of 1 to 6, characterized by the steps of hydrolyzing a solution containing an ester compound represented by the formula (1):
wherein R is a lower alkyl group and n is an integer of 1 to 6, and a compound represented by the formula (2):
wherein R is as defined above, adjusting the pH of the resulting solution to pH 4 to 8, and then subjecting to phase separation to obtain an organic layer containing the carboxylic acid of formula (3).