ChemInform Abstract: SYNTHESES AND PROPERTIES OF DIMETHYLDIPHENYLTETRADEHYDRO‐TRIDECA‐, ‐PENTADECA‐, HEPTADECA‐, NONADECA‐FULVENE, AND BENZANNULATED PENTADECAFULVENE DERIVATIVES

Abstract

Durch Reaktion der Annulenone (Ia)‐(IVa) mit aus der Essigsäure (V) gebildetem Diphenylketen lassen sich die roten Titelverbindungen (Ib)‐(IVb) herstellen.

Syntheses and properties of dichlorodimethyltetradehydro-trideca-,-pentadeca-, -heptadeca-, and -nonadeca-fulvene, and benzannelated pentadecafulvene derivatives

“…The inner proton(s) of all of the fulvenes (18)-(21) resonate at rather low field compared with the outer protons in each case, reflecting the fact that the diacetylene moiety exerts a local anisotropic effect on the inner proton(s), as has been observed for the corresponding diphenyl series (3) and (4). 2 This observation also supports the supposition that these fulvenes do not possess a ring current. Therefore, it is concluded that the fulvene molecules (18)-( 21) are not significantly polarized by the presence of two chlorine atoms at the exocyclic double bond in the ground state.…”