Photolysis of vinyl halides. Preferential formation of vinyl cations by copper(II) salts
作者:Tsugio. Kitamura、Shinijiro. Kobayashi、Hiroshi. Taniguchi
DOI:10.1021/ja00270a023
日期:1986.5
Photolysis of vinyl halides in the presence of copper(II) salts resulted in a significant suppression of product formation derived from vinyl radicals. Photolysis of 1,1-diaryl-2-bromopropenes in the presence of copper(II) salts yielded no 1,1-diaryl-2-propenes. Photolysis of other vinyl halides, i.e., 1,1-diaryl-2-iodopropenes, 1,1-diaryl-2-bromoethylenes, and 1-bromo-2-(p-methoxyphenyl)ethylene,
在铜 (II) 盐存在下卤乙烯的光解导致乙烯基产物形成的显着抑制。在铜 (II) 盐的存在下,1,1-二芳基-2-溴丙烯的光解没有产生 1,1-二芳基-2-丙烯。其他乙烯基卤化物,即 1,1-二芳基-2-碘丙烯、1,1-二芳基-2-溴乙烯和 1-溴-2-(对甲氧基苯基)乙烯的光解也导致衍生自乙烯基自由基的还原烯烃的产率。发现三氟甲磺酸铜 (II) 对乙烯基自由基的氧化比乙酸铜 (II) 更有效。这些反应可以通过乙烯基铜中间体的介入和乙烯基阳离子的形成来解释。