Benzyl halides are efficiently carbonylated to phenylacetic acids in the pr
esence of a catalytic amount of the dimer of chloro(1,5-cyclooctadiene)rhod
ium(I) in formic acid. Under these reaction conditions, sensitive functiona
lities such as esters and nitriles are tolerated and the phenylacetic acids
are obtained in good to high yields. (C) 2000 Elsevier Science Ltd. All ri
ghts reserved.