Effects of a meta-or para-electron withdrawing substituent on benzylic functionalization of arene–chromium–tricarbonyl complexes have been studied; tricarbonyl {η6-( t-butyl 3,4-dimethylbenzoate)} chromium promoted the attachment of the CRHOH group exclusively at the 4-methyl group, while the 3-methyl group remained unchanged.
J. Brocaed, A. Laconi, D. Couturier, S. Top and G. Jaouen, J. Chem. Soc., Chem. Commun., 1984, 475 DOI: 10.1039/C39840000475
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