Abstract

Abstract The title compound and its phenyl derivatives have been prepared by the advantageous route which we have developed. These cross-conjugated compounds are suggested to have a preferable contribution of the quinonoid resonance structure at the ground state, but are slightly more polar than the iso-π-electronic 5-cycloheptatrienylidene-2(5H)-thiophenone, revealing that the dithiolidene residue is more electron-donating than the cycloheptatrienylidene one.

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