4a-Methyl-4aH-fluorenes
Abstract
The monobenzo derivative (1) of 3a-methyl-3aH-indene and its methyl derivative (3) have been synthesised; although isolable they are reactive, undergoing autoxidation, dimerisation, and other [4 + 2]cycloadditions, thermal and acid catalysed aromatisation to fluorenes, and photochemical rearrangement to naphthalenes.