Abstract The anion derived from 2-methylpropyl 3-(2-methylpropoxy)-5-oxocyclohex-3-ene-1- carboxylate was reacted with methyl iodide to give cis and trans isomers of 2-methylpropyl 6- methyl-3-(2-methylpropoxy)-5-oxocyclohex-3-ene-1-carboxylate. The reaction proceeded with high regioselectivity. A combination of nmr experiments was used to determine that the major diastereoisomer was in a trans configuration. The dianion derived from 2- ...
