retention of one halogen. The monosubstituted dehalogenated compounds are formed in low overall yields in the reactions of o-diiodobenzene with the carbanions of 1-(2-naphthyl)ethanone and of acetophenone and in the reaction of o-bromoiodobenzene with the carbanion of propiophenone. The reactions can be performed in the dark, with usually increased yields of substitution under irradiation, as well as under
                                    邻
碘代卤代苯(X = I,Br,Cl)在
DMSO中与
苯乙酮,丙苯酮和1-(2-
萘基)乙酮的烯醇离子反应,主要提供单取代基并保留一个卤素。在邻二
碘代苯与1-(2-
萘基)乙酮和
苯乙酮的碳负离子的反应中以及在邻
溴代
碘苯与丙苯酮的碳负离子的反应中,单取代的脱卤化合物以较低的总收率形成。反应可以在黑暗中进行,通常在辐照下以及在FeBr 2下可以提高取代的收率。引发。用
铜青
铜处理2-(2-
溴苯基)-1-苯基乙酮,得到闭环的
苯并呋喃产物。脱卤度是根据分子内电子从ArCO-π系统转移到拟作为中间体的单取代自由基阴离子中的C-卤素σ键的能量进行讨论的。通过几何因素分析了由这些自由基阴离子脱卤形成的自由基的闭环不足。