The adduct of 2-methoxytropone and sodium methoxide: a flattened, conjugated seven-membered ring with tetrahedral carbon
Abstract
The first stable adduct from a nucleophile, potassium methoxide, and a deativated cycloheptatrienone, 2-methoxytropone, has a flattened gem-dialkoxy-structure, whilst adducts at an unsubsititued carbon, such as those from methoxide with tropone, are short-lived species.