K. Kudo et al., PALLADIUM(II)-CATALYZED HYDROESTERIFICATION OF ENOL ESTERS - REMARKABLE ALPHA-SUBSTITUENT EFFECT UPON REGIOSELECTIVITY, Reaction kinetics and catalysis letters, 59(1), 1996, pp. 29-33
Pd(II)-catalyzed hydroesterification of various enol esters smoothly p
roceeded upon the combined use of pressurized carbon monoxide and meth
anol to give the alpha- or beta-acetoxy esters with the regioselectivi
ty highly depending on the size of the alpha-substituent.