It also covers one-step synthesis of benzene derivatives, beta-substituted naphthalenes, and acenes by the cylcoaromatization of enediynes and enyne-allenes, and includes the mechanisms of cylcoaromatization resulting in the formation of fulvene
and indene systems.
Tacke, "Novel achiral titanocene anti-cancer drugs synthesised from bis-N,N-dimethylamino fulvene
and lithiated heterocyclic compounds," BioMetals, vol.
Given that benzene could form isomers such as benzvalene and fulvene
via an [S.sub.1]/[S.sub.0] conical intersection, the barrier for ethene + benzene cycloaddition must be very small to compete effectively with isomer formation.
Although quite (thermally) stable, benzene molecules can become quite reactive when being photoexcited; they can be transformed to benzvalene [7, 8] and fulvene
when being excited to the first singlet ([S.sub.1]) excited state or to Dewar benzene [9, 10] when being excited to the second singlet ([S.sub.2]) excited state.