The thermal reaction of phenylazotriphenylmethane and naphthylazotriphenylmethane derivatives with sulphur dioxide
作者:H. Takeuchi、T. Nagai、N. Tokura
DOI:10.1016/s0040-4020(01)82832-5
日期:1969.1
The thermal reaction of phenylazotriphenylmethane, (I), with SO2 in benzene or n-heptane gives triphenylmethyl phenyl sulphone (II) in good yield. This reaction is suppressed by a radical scavenger such as n-butylmercaptan to give n-butyl triphenylmethyl sulphide. The kinetic data obtained from the decomposition of I in liquid SO2 does not differ much from the data in toluene. However, when two crossed
苯基偶氮三苯基甲烷(I)与SO 2在苯或正庚烷中的热反应可得到高产率的三苯基甲基苯基砜(II)。该反应被自由基清除剂如正丁基硫醇抑制,得到正丁基三苯基甲基硫醚。从液态SO 2中的I分解获得的动力学数据与甲苯数据相差无几。然而,当在每种情况下使用两种化学标记的偶氮化合物进行两个交叉反应时,尽管选择的两个偶氮化合物以大致相同的速率分解,但未观察到各自的交叉化合物。此外,没有形成分子间偶联产物二苯基二砜。这些事实表明II的形成不是4中心型构型或分子间自由基机理,而是由于SO 2的特殊笼形而通过分子内自由基反应。