作者:Erkki J. Nurminen、Jorma K. Mattinen、Harri Lönnberg
DOI:10.1039/a904406j
日期:——
Kinetics of the reaction of diisopropyl tetrazolylphosphonite with tert-butyl alcohol in dry THF have been studied in the presence of various acids, bases and salts that catalyze the process. Ammonium azolide salts were found to be considerably more efficient catalysts than the corresponding azole acids or tertiary amine bases. For instance, the relative rates obtained with N,N-diisopropylethylammonium tetrazolide, N,N-diisopropylethylamine and tetrazole were 104, 28 and 1, respectively. The salts of strong protolytes turned out to be better catalysts than those of weak ones. The susceptibility of the reaction rate to the pKBH+ of the base is fairly strong (Brønsted β = 0.41) compared to the sensitivity to the pKa of azoles (β = 0.17). The mechanisms of catalysis are discussed.
我们研究了二异丙基四唑基亚磷酸盐与叔丁醇在干燥的四氢呋喃中反应的动力学,该反应在各种酸、碱和盐的催化下进行。研究发现,偶氮唑铵盐比相应的偶氮唑酸或叔胺碱是更有效的催化剂。例如,N,N-二异丙基乙基四唑化铵、N,N-二异丙基乙基胺和四唑的相对速率分别为 104、28 和 1。结果表明,强原聚物的盐比弱原聚物的盐具有更好的催化作用。与对唑类化合物 pKa 的敏感性(β = 0.17)相比,反应速率对碱的 pKBH+ 的敏感性相当强(布氏β = 0.41)。本文讨论了催化机制。