Ei. Troyansky et al., HOMOLYTIC MACROCYCLIZATION OF ALKYNES WITH PROPANE-1,3-DITHIOL AS A ROUTE TO 14-MEMBERED AND 21-MEMBERED CROWN THIOETHERS, Mendeleev communications, (3), 1993, pp. 112-114
Crown thioethers, 1,4,8,11-tetrathiacyclotetradecanes and 1,4,8,11,15,
18-hexathiaheneicosanes, have been synthesized as 2:2 and 3:3 cycloadd
ucts in a 'one-pot' homolytic macrocyclization of alkynes with propane
-1,3-dithiol.