1.3- Dithiol-2-ylidene

A-Propargyl dithiocarbonates (xanthates) 533 bearing a variety of substituents were convenient precursors of 1,3-dithiole-2-ylidene derivatives 534 by reaction with active methylene compounds involving a [3,3]-sigmatropic rearrangement (Equation 64) <1995TL5171>. In all cases except dibenzoylmethane, a mixture of regioisomers was obtained, with double bond exo or endo. 

Activated methylenes may react with one or two 1,3-dithiolium ions (Scheme 30). When the methylene compound condenses with an equimolar amount of 1,3-dithiolium ion, the adduct 170 is easily oxidized and the final product is a 1,3-dithiol-2-ylidene derivative of the starting methylene compound. Some results are given in Table Starting from 4-phenyl-1,3-dithiolium cation and tropolone, a compound of type 170 is obtained, but halogenotropolones give mixtures of compounds 170 and 171. ° ... 

Morioka, Y. et al.. Novel field-effect transistors based on bis(1,3-dithiol-2-ylidene)... 

C32H32CIO4S8, Bis(4,5-dimethyl-2H-1,3-dithiol-2-ylidene)-1,4-cyclo-hexa-2,5-diene perchlorate, 46B, 372 C32H32S8, 4,6,12,14,20,22,28,30-Octamethyl-1,2,9,10,17,18,25,26-octathia[2.2.2.2]metacyclophane, 46B, 372 C311H2412. 15S2 r Tetraphenyldithiapyranylidene polyiodide, 46B,... 

C1gH2oMnOsPS2, Carbonyl-Tj -cyclopentadienyltrimethoxyphosphine-(4,5-bis(methoxycarbonyl)-1,3-dithiol-2-ylidene)manganese(I), 46B, 881 C1gH2 2Cl2Pd2 f Di-M chloro-bis(1,5-cyclooctadienylpalladium), 42B,... 

Scheme 8.1 Redox of (a) TTF, (b) 1,3-dithiol-2-ylidene compounds, and (c) a dendraiene-type polymer with DT rings.

ClFeO 2/I7S4CSH4.1.3-Dithiole. 2-(1.3-dithiol-2-ylidene)-. compd. with iron chloride oxide (FeClO) (2 17). [158188-72-81.30 177 ClFeO 2/17Se4CjH4. 1,3-Diselenole. 

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