Intermediates in the decomposition of aliphatic diazo-compounds. Part VIII. The mechanism of ether formation from diarylmethylenes and alcohols
作者:D. Bethell、A. R. Newall、D. Whittaker
DOI:10.1039/j29710000023
日期:——
The thermal decomposition of diphenyldiazomethane and its 4,4′-dichloro-, 4,4′-dimethoxy-, and 4,4′-dimethyl analogues at 85 °C in acetonitrile containing methyl and t-butyl alcohols (ca. 1M) has been studied. Kinetic studies indicate that the major reaction product, the alkyl diarylmethyl ether, is formed by attack of intermediate diarylmethylene on the alcohol. The relative reactivities of methyl and
二苯重氮甲烷及其4,4'-二氯-,4,4'-二甲氧基-和4,4'-二甲基类似物在含甲醇和叔丁醇(约1 M的乙腈)中在85°C下热分解)已被研究。动力学研究表明,主要的反应产物烷基二芳基甲基醚是由中间体二芳基亚甲基攻击醇而形成的。已经确定了甲醇和叔丁醇对一系列二芳基亚甲基的相对反应性:甲醇在所有情况下均具有更高的反应性,但是两种醇之间的反应性差异随着4-取代基电子释放的增加而减小。通过检查由二芳基亚甲基与羟基tri化的醇反应形成的产物醚的放射性,已检测到对醚形成的基本动力学同位素效应。在所有情况下,对于叔丁基醚而言,同位素效应都比对甲基醚更大。