NMR spectroscopy of metal cyclopentadienyls VIII. Prototropism and dimerisations of silicon cyclopentadienyls
作者:G.I. Avramenko、N.M. Sergeyev、Yu.A. Ustynyuk
DOI:10.1016/s0022-328x(00)89264-5
日期:1972.4
Studies have been made of the slow dynamic processes which occur with the silicon cyclopentadienyls C5H5Si(CH3)Cl2, such as prototropicrearrangement and dimerisation. The product formed through spontaneous dimerisation has been found to consist almost entirely of the dimer of the main vinylic isomer of C5H5Si(CH3)Cl2. The dimeric structure has been proved by means of PMR spectra (100 MHz). From kinetic
已经研究了环戊二烯基硅C 5 H 5 Si(CH 3)Cl 2发生的缓慢动力学过程,例如质子重排和二聚化。已经发现通过自发二聚作用形成的产物几乎全部由C 5 H 5 Si(CH 3)Cl 2的主要乙烯基异构体的二聚体组成。二聚体结构已通过PMR光谱(100 MHz)证明。通过动力学研究,获得了温度为20、44、55和65°时的速率常数值,并得出了log k vs.的近似图。(1 / T)x10 3,使得能够计算质子重排和二聚化的热力学特性。讨论了环戊二烯基体系经历氢迁移的能力,并且表明通量体系的反应性受金属致重排速率控制。