FULVALENE TYPE COMPOUNDS CONTAINING 1,3-DITHIEPIN COUNTERPART. QUALITATIVE EVALUATION OF THE ELECTRON ACCEPTING ABILITY OF 1,3-DITHIEPIN SYSTEM

Abstract Some fulvalenoids containing 1,3-dithiepin counterpart (5a), (5b), and (5c) have been synthesized through the reaction of 2-trimethylsilyl-1,3-dithiepinide ion (6) with di-tert-butyl-cyclopropenone, 2,3;6,7-dibenzotropone, and fluorenone, respectively. Comparison of the 1H-NMR spectra of these fulvalenes indicated the electron accepting ability of the 1,3-dithiepin moiety.