Salt with 2,2 -bi-l,3-dithiolylidene

The syntheses of bis-l,3-dithiolylidene compounds noted above, involving treatment of 1,3-dithiolium salts with bases, are thought to proceed through carbene intermediates. These may be generated in other ways, for example, by the action of carbon disulphide on acetylenes (81 R = CF3) and by the action of triphenylphosphine on the l,3-dithiole-2-thione (83 R = CF3). In the first of these two methods, more complex products. 

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