Triphenylmethanethiosulfenyl chloride 1 [(C6H5)3CSSCl] ( and its dithi
o homolog 2 [(C6H5)(3)CSSSCl]) give stable addition products (ca. 85%
yield) with cyclopentene and cyclohexene. When these adducts are warme
d with a diene, they deliver diatomic sulfur-trapped derivatives. Thes
e tetrasulfides are quantitatively converted to the corresponding disu
lfide 3 with triphenylphosphine; this affords cyclic disulfides in > 5
0% isolated yield from the diene. In addition, evidence has been obtai
ned implicating dithietane intermediate 4.