Yl. Hu et al., CARBONYLATION OF BENZYL HALIDES USING BIS(TRIPHENYLPHOSPHINE)COBALT DICHLORIDE UNDER PHASE-TRANSFER CATALYSIS, Synthetic communications, 24(12), 1994, pp. 1743-1748
Using Co(PPh3)2Cl2 as catalyst, the carbonylation of benzyl halide wit
h CO (1 atm) in a binary system (aq.NaOH/C5H5) in the presence of tetr
abutylammonium bromide as phase transfer catalyst for 10 h gives the c
orresponding carboxylic acid in good to excellent yields. The effects
of phase transfer catalyst and reaction temperature on the reactions h
ave been investigated. The reaction mechanism is briefly discussed.