Abstract
Tetramethyl-3-thio-1,3-cyclobutanedione (1) and tetramethyl-1,3-cyclobutanedithione (6) react with oxygen in the presence of light to yield tetramethyl-1,3-cyclobutanedione (2). A mechanism involving singlet oxygen is suggested. 1,3-Diphenyl-2-propanethione (3) undergoes accelerated dimerization in the presence of visible radiation to yield tetrabenzyl-1,3-dithietane (4).
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