Organylthiochloroacetylenes: V. Dimerization of alkylthiochloroacetylenes in the presence of sodium sulfite

摘要

Alkylthiochloroacetylenes dimerize at room temperature in the system sodium sulfite-polar nonhydroxylsolvent (DMSO, DMF, HMPA) to form in 40-63% yields (Z)-1,4-bis(alkylthio)-1,2-dichloro-1-buten-3-ynes which are promising polyfunctional monomers and building blocks for fine organic synthesis. The structure of the resulting dimers was established by means of IR and ~1H and ~(13)C NMR spectroscopy, X-ray fluorescent analysis, and dielcometry and confirmed by mass spectrometry and elemental analysis.