Ring Expansion of Spirocyclic Cyclobutenylidene Ligands in Pentacarbonylchromium Complexes to Tetrahydroindene Derivatives
作者:Helmut Fischer、Christoph C. Karl、Gerhard Roth
DOI:10.1002/cber.19961290605
日期:1996.6
bond of the vinylidene ligand of 1. Initially, complexes with a spirocyclic cyclobutenylidene ligand are formed, [(CO)5Cr(CH2)5] (3) and [(CO)5-Cr(CH2)5] (10). Subsequent thermally initiated ring expansion affords the 2-methyl-4,5,6,7-tetrahydroindenyl(methyl)thioether complex [(CO)5-Cr–S(Me)(Me-C9H10)] (4) and the N-(2-methyl-4,5,6,7-tetrahydroindenyl)phenothiazine complex [(CO)5Cr–S(C6H4)2-N–(Me-C9H10)]
五羰基(五亚甲基亚乙烯基)铬[[CO)5 CrCC(CH 2)5 ](1)通过区域特异性与1-甲硫基-1-丙炔(2a)和N-(1-丙炔基)吩噻嗪(2b)反应炔的CC键与1的亚乙烯基配体的CC键的加成。最初,形成具有螺环的环丁烯基配体的配合物,[(CO)5 Cr(CH 2)5 ](3)和[(CO)5 -Cr(CH 2)5 ](10)。随后的热引发的扩环提供了2-甲基-4,5,6,7-四氢茚基(甲基)硫醚配合物[(CO)5 -Cr–S(Me)(Me-C 9 H 10)](4)和的ñ - (2-甲基-4,5,6,7-四氢茚基)吩噻嗪配合物[(CO)5的Cr-S(C 6 H ^ 4)2 -N-(ME-C 9 H ^ 10)](11) , 分别。在两种配合物4和11中,配体均通过硫原子与金属配位。通过(H,H)-,(H,C)-和NOE-相关的NMR光谱确定结构。在反应1中与2a一起,除3和4外,还形