The reaction between nitrous acid and NN′-dimethylthiourea and imidazolidine-2-thione (ethylenethiourea) involves a rapid, reversible initial nitrosation at sulphur, followed by a slower transfer of the nitroso group to the secondary amino group to form an N-nitrosothiourea. The kinetics exclude the possibility of the N-nitroso compound being formed by direct N-nitrosation and require the S-nitroso
亚硝酸与NN'-二甲基
硫脲和
咪唑烷-2-
硫酮(亚乙基
硫脲)之间的反应涉及在
硫磺处快速,可逆的初始亚硝化,然后将亚硝基缓慢转移至仲
氨基以形成N-亚硝基
硫脲。动力学排除了通过直接N-亚硝化形成N-亚
硝基化合物的可能性,并且要求S-亚
硝基化合物为前体。S-亚硝基烷基
硫脲向N的转化-亚硝基产物涉及确定速率的质子损失以形成中间体,该中间体在涉及质子化和亚硝基基团从
硫到氮的转移的步骤之间分配。