R. Gleiter et al., CONJUGATED CROWN THIOETHERS AND STRAINED CYCLIC ALKYNES BY NUCLEOPHILIC S-N'-REACTION, Tetrahedron letters, 36(11), 1995, pp. 1835-1838
The reaction of 2,7-dimethyl-2,7-dichloroocta-3,5-diyne (1) with sever
al alpha-omega-dithiols leads to crown thioethers with 1,4 diisopropyl
idene-2-butyne units as building