Autoxidation of N-alkyl-amides. Part II. N-alkyl-amide hydroperoxides and di-N-alkyl-amide peroxides
作者:B. F. Sagar
DOI:10.1039/j29670000428
日期:——
formed. Decomposition of these hydroperoxides in solution in N-alkyl-amide solvents has been investigated. The principal products are (i)N-acyl-amides and water, (ii)N-formyl-amides and alcohols, (iii) primary amides and aldehydes, and (iv)N-alkenyl-amides and hydrogen peroxide. The overall decomposition is first-order for at least one half-life but is then autocatalytic. For the decomposition of 1-propionamidopropyl
在N -n-烷基酰胺的热氧化过程中形成1-氨基-n-烷基氢过氧化物。由热氧化中分离的纯的氢过氧化物Ñ -ethylacetamide,Ñ -n-propylpropionamide,NN -diethylacetamide,和NN -二-正- propylpropionamide是相对稳定的结晶固体。阻碍了围绕–CO·N–键的旋转,并且在顺式构型中形成了7元分子内氢键键合环。已经研究了这些氢过氧化物在N-烷基酰胺溶剂中的分解。主要产品是(i)N-酰基酰胺和水,(ii)N-甲酰基酰胺和醇,(iii)伯酰胺和醛,和(iv)N-烯基酰胺和过氧化氢。整体分解是一阶的,至少具有一个半衰期,但随后是自催化的。对于1-丙酰胺基丙基过氧化氢的分解,k = 2·3×10 9 exp(–23,700 / R T)sec。–1。测量所添加的1-萘酚的去除速率表明,只有一小部分分解是均溶的。主要分解是非自由基协同分解。