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The synthesis is described of a series of mono-, bis-, and tris(1,3-dithiol-2-ylidene) derivatives7,9 and10 starting from 1,3-indanedione. Cyclic voltammetric data establish that the π-electron donor ability of these molecules increases in the sequence7 < 9 < 10, which is consistent with stabilisation of the cationic species by the presence of additional 1,3-dithiole units. The X-ray crystal...
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