Reactivity of triplet diphenylcarbene towards the sulphur atom of 1,2,3-benzothiadiazole
作者:Luisa Benati、Pier Carlo Montevecchi、Piero Spagnolo、Antonio Tundo
DOI:10.1039/p19810001544
日期:——
Thermal decomposition of diphenyldiazomethane (1) at 87 °C in chlorobenzene in the presence of 1,2,3-benzothiadiazole (2) afforded 9-phenylthioxanthen (3), 6-phenyl-6H-dibenzo[b,d]thiopyran (4), 6-benzhydryl-6-phenyl-6H-dibenzo[b,d]thiopyran (5) and thianthren (6). Reaction products are explained in terms of attack on the sulphur atom of (2) by triplet diphenylcarbene, leading to decomposition of the
在1,2,3-苯并噻二唑(2)存在下于87°C在氯苯中热分解二苯基重氮甲烷(1),得到9-苯基噻吨黄酮(3),6-苯基-6 H-二苯并[ b,d ]硫代吡喃( 4),6-苯甲酰基-6-苯基-6 H-二苯并[ b,d] thiopyran(5)和thianthren(6)。用三重态二苯碳烯对(2)的硫原子的攻击来解释反应产物,导致杂环核的分解和氮的损失,并形成双自由基中间体(7),由此生成产物(3)–(6 )可能会出现。已有证据表明,苯并噻二唑(2)可以作为三重态二苯卡宾的有效自旋阱,从而防止单重态和三重态的可逆相互转化。