Decomposition of a series of N-cyclopropyl-N-nitrosoureas (CNU) in CD3OD was studied. These decompose much more rapidly than N-methyl-N-nitrosourea, one of the decomposition pathways being denitrosation, which is atypical of alkylnitrosoureas under the reaction conditions used. The nature of substituents in the cyclopropane ring has a great effect on the stability of CNU and the product ratio. In the presence of H2 SO4, decomposition occurs much more rapidly. Possible pathways of the formation of the major decomposition products of CNU are proposed based on the experimental data.
对一系列N-环丙基-N-亚硝基
脲(CNU)在CD3OD中的降解进行了研究。它们的降解速度远快于N-甲基-N-亚硝基
脲,其中一个降解途径是脱亚硝基化,这在所用反应条件下对烷基亚硝基
脲而言是不典型的。
环丙烷环中取代基的性质对CNU的稳定性和产物比具有很大影响。在H2SO4存在下,降解速度大大加快。根据实验数据,提出了CNU主要降解产物形成的可能途径。