Evidence is presented which suggests that the base-induced formation of difluorenylidene from fluorenone sulphine occurs through a sulphoxide dianion in a reaction sequence similar to the phenyl-lithium-promoted conversion of dibenzyl sulphoxide into stilbene.
A. G. Schultz and R. H. Schlessinger, J. Chem. Soc. D, 1970, 748 DOI: 10.1039/C29700000748
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