The Cis−Trans Isomerization of 1,2,5,6-Tetrasilacycloocta-3,7-dienes: Analysis by Mechanistic Probes and Density Functional Theory
作者:Lei Zhang、Christopher W. Borysenko、Thomas A. Albright、Eric R. Bittner、T. Randall Lee
DOI:10.1021/jo0014818
日期:2001.8.1
exposure to Ru and Zr hydride complexes was explored. Experimental probes of the isomerization were consistent with a stepwise mechanism involving metal hydride addition/elimination rather than one involving radical intermediates. Analysis of the low energy conformers of the various cis and trans isomers of 1,1,2,2,5,5,6,6-octamethyl-1,2,5,6-tetrasilacycloocta-3,7-diene using density functional theory
制备了一系列顺式,顺式,1,2,5,6-四硅环环辛-3,7-二烯的烷基和芳基取代的衍生物。探索了通过暴露于Ru和Zr氢化物络合物将这些化合物异构化为相应的反式,反式-1,2,5,6-四硅环辛基-3,7-二烯。异构化的实验探针与涉及金属氢化物添加/消除而不是涉及自由基中间体的逐步机理是一致的。使用密度泛函分析1,1,2,2,5,5,6,6-八甲基-1,2,5,6-四硅环辛基-3,7-二烯的各种顺式和反式异构体的低能构象理论表明稳定性有以下趋势:反式,反式>顺式,反式>顺式,顺式。