作者:Samuel Braverman、Tatiana Pechenick-Azizi、Hugo Gottlieb、Milon Sprecher
DOI:10.1055/s-0030-1258395
日期:2011.2
addition reactions of selenium tetrachloride and selenium tetrabromide to propargyl alcohols are reported. (Z,Z)-Bis(β-chlorovinyl)selenium dichlorides were isolated in high yields, and their reactivity was dependent on their substitution pattern. Products derived from unsubstituted, α-methyl-, or α,α-dimethylpropargyl alcohols readily underwent transfer of chlorine atoms to one of the two double bonds. (Z
报道了四氯化硒和四溴化硒与炔丙醇的区域和立体定向亲电加成反应。(Z,Z)-双(β-氯乙烯基)二氯化硒的分离产率高,其反应性取决于其取代方式。衍生自未取代的α-甲基-或α,α-二甲基炔丙基醇的产品容易将氯原子转移至两个双键之一。(ž,ž来自γ-苯基-或γ-异丙烯基炔丙基醇的双(β-氯乙烯基)二氯化硒进行环化反应生成苯并硒吩衍生物; 这伴随着相应的二氯取代的烯丙基醇的形成。相反,四氯化硒仅与作为氯化剂的γ-苯基炔丙醇反应,定量得到(3-氯丙-1-炔-1-基)苯。还描述了区域和立体定向亲电子加成四溴化硒的产物。提出了反应机理。 亲电子添加剂-炔烃-醇-硒-卤化物