Kinetics of base-catalyzed cyclization of 2,6-dinitrophenylsulfanyl ethanenitrile and 2,4,6-trinitrophenylsulfanyl ethanenitrile
作者:Jiří Černý、Jiří Hanusek、Vladimír Macháček
DOI:10.1002/poc.1401
日期:2008.11
The kinetics of base catalyzed cyclization of 2,6-dinitrophenylsulfanyl ethanenitrile and 2,4,6-trinitrophenylsulfanyl ethanenitrile giving 2-cyano-7-nitrobenzo[d]thiazole-3-oxide and 2-cyano-5,7-dinitrobenzo[d]thiazole-3-oxide respectively was studied in methanolic methoxyacetate, acetate, trichlorophenoxide, N-methylmorpholine, and N-methylpiperidine buffers at 25 °C and I = 0.1 mol L−1. It was found
碱催化2,6-二硝基苯硫基乙腈和2,4,6-三硝基苯硫基乙腈的环化反应,生成2-氰基-7-硝基苯并[ d ]噻唑-3-氧化物和2-氰基-5,7-二硝基苯并[ d]在25℃和I = 0.1 mol L -1下,分别在甲氧基乙酸甲醇酯,乙酸酯,三氯酚氧化物,N-甲基吗啉和N-甲基哌啶缓冲液中研究了[thiaazole-3-oxide] 。已发现反应涉及一般的酸和一般的碱催化剂,其表现取决于酸缓冲剂组分的p K a和两种缓冲剂组分的比例。在弱碱性缓冲区中,限速步骤为C环状中间体中的H键断裂,而在强碱性缓冲液中,限速步骤是一般酸催化的中间体中羟基的消除。版权所有©2008 John Wiley&Sons,Ltd.