Migration tendencies of functional groups toward sigmatropic rearrangement in 3,3-disubstituted 3H-pyrazoles
作者:Peter Sciess、Henri Stalder
DOI:10.1016/s0040-4039(00)92734-5
日期:——
3,3-Disubstituted 3H-pyrazoles - aromatise through an intramolecular sigmatropic 1,5-(1,2-) shift of one of the quaternary groups. From a kinetic study of the uncatalysed and of the acid catalysed isomerisation reaction migration tendencies of functional groups in sigmatropic rearrangement toward neutral and toward cationic centers are obtained.
3,3-二取代的3H-吡唑-通过四元基团之一的分子内σ1,5-(1,2-)转移而芳香化。通过对未催化的和酸催化的异构化反应的动力学研究,获得了在σ重排的官能团向中性中心和向阳离子中心迁移的趋势。