Synthesis of Highly Unsaturated Organic Sulfur Compounds from 1,4-Dichlorobut-2-yne and Propane-1,3-dithiolate

The reaction of 1,4-dichlorobut-2-yne with propane-1,3-dithiolate was carried out for the first time. A mixture of cyclic (2-vinyl-1,4-dithiepan-2-ene) and linear (5,10-dithiatridec-1,12-diyne-3,10-diene) products was synthesized, in 30 and 15% yields, respectively.