In the Claisen Condensation processcondensation, the RO-an alkoxide $\ce{RO-}$ acts as a base. However, in trans esterification,R'O-esterification, an alkoxide $\ce{R'O-}$ attacks the estercarbonyl carbon of R-OO-CH3an ester as a nucleophile. Is it sothis because ofa different 'R' group is used in trans esterification-esterification? Please explain.