Using a catalytic amount of platinum(II) terpyridyl complex 3, 3,4-diarylthiophenes (2a-f) could be synthesized from 3,4-diaryl-2,5-dihydrothiophenes (1a-f) under visible light (lambda > 450 nm) irradiation in degassed CH3CN. Spectroscopic study and product analysis reveal that the reaction is initiated by photoinduced electron transfer from 3,4-diaryl-2,5-dihydrothiophenes to platinum (II) complex 3, leading to the formation of 3,4-diarylthiophenes.
Facile Synthesis of Novel Photochromic 1,2-Diheteroaryl-Substituted Cycloalkenes by Titanium-Induced Intramolecular Coupling Reaction
作者:Zhen-Nian Huang、Bao-An Xu、Sheng Jin、Mei-Gong Fan