作者:Atsutaka Kunai、Junji Harada、Masayasu Nishihara、Yasuo Yanagi、Kazuo Sasaki
DOI:10.1246/bcsj.56.2442
日期:1983.8
Cathodic behavior of N-cyclohexylidenepyrrolidinium salt (1) and N-cyclohexylideneaniline (2) in acetonitrile has been studied by means of dc polarography, cyclic voltammetry and preparative electrolysis under controlled potential conditions. The compound 1 exhibits a reduction wave at about −1.8 V, which is accompanied by formation of a surface compound. The products obtained from the preparative electrolysis were neither saturated amines nor dimeric compounds but were mostly polymeric materials. However, when electrophilic olefins, such as acrylonitrile or methyl acrylate, were present in the solution, coupling products were produced. The compound 2, which cannot be reduced by itself below −2.7 V, is reduced at about −1.8 V when benzoic acid is in the solution. The reduction product in this case was N-cyclohexylaniline, which was replaced by a coupling product when acrylonitrile was present in the reaction system. The formation of the coupling products is considered to occur by a radical mechanism in both cases.
在受控电位条件下,通过直流极谱法、循环伏安法和制备电解法研究了 N-环己基亚甲基吡咯烷鎓盐 (1) 和 N-环己基亚甲基苯胺 (2) 在乙腈中的阴极行为。化合物 1 在约 -1.8 V 的电压下出现还原波,同时形成表面化合物。制备电解得到的产物既不是饱和胺,也不是二聚化合物,而主要是聚合材料。然而,当溶液中存在亲电烯烃(如丙烯腈或丙烯酸甲酯)时,就会产生偶联产物。化合物 2 本身不能在低于 -2.7 V 的电压下被还原,但当溶液中含有苯甲酸时,它在约 -1.8 V 的电压下被还原。在这种情况下,还原产物是 N-环己基苯胺,当反应体系中存在丙烯腈时,该产物被偶联产物取代。在这两种情况下,偶联产物都是通过自由基机制形成的。