Rhodium-catalyzed isomerization and alkyne exchange reactions of 1,4-dithiines occurred by cleavage of two C–S bonds. The 2,5- and 2,6-disubstituted 1,4-dithiins underwent isomerization reactions in toluene at 110 °C, providing equilibrium mixtures of isomers. At 150 °C, the reaction of 1,4-dithiins and dimethyl acetylenedicarboxylate gave unsymmetric 2,3-di(methoxycarbonyl)-1,4-dithiins and 2,3-d
The one-pot synthesis of a mixture of diphenylthiophenes land 2 from the reaction of phenylacetylene and sulfur under various reaction conditions was studied. Potential intermediates and a reaction pathway are postulated.
Voronkov, M. G.; Usov, V. A.; Shagun, L. G., Journal of Organic Chemistry USSR (English Translation), 1988, vol. 24, # 11, p. 2223 - 2224
作者:Voronkov, M. G.、Usov, V. A.、Shagun, L. G.、Usova, T. L.、Protasova, L. E.、Klyba, L. V.