Methanol thiocarbonyl compounds

Particular interest has been shown this year in the photochemistry of thiocarbonyl-containing compounds. Photochemically induced a-cleavage from the lowest triplet state appears to be a general but inefficient reaction of cyclobutanethiones. The biradical intermediate (237) derived from the dithione (238), for example, undergoes closure to the dithiolactone (239) or ring expansion to the carbene (240) which is then trapped with methanol as the... 

Generation of a carbene, by the copper-catalysed decomposition of bis-toluene-p-sulphonyldiazomethane, in the presence of 4-phenyl-1,2-dithiole-3-thione results in the quantitative formation of the stable, red, thiocarbonyl ylide (13) with Chloramine T in methanol, the analogous nitrogen compound (14) is formed. Similar reactions occur with benzo-... 

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