The role of norcaradiene intermediates in the rearrangement of norbornadien-7-one acetals
Abstract
The bis(methoxycarbonyl)tetrachlorobornadienone dimethyl acetal (1) rearranges spontaneously to the hemimellite (2)via the norcaradiene intermediate (6); the corresponding anhydride (5) is stable below 200 °C because steric strain prevents its conversion into a analogous into an analogous intermediate (9).