Regioselective Formation of ?-Alkyl-?-phenyliridabenzenes via Unsymmetrical 3-Vinylcyclopropenes: Probing Steric and Electronic Influences by Varying the Alkyl Ring Substituent
作者:He-Ping Wu、Timothy J. R. Weakley、Michael M. Haley
DOI:10.1002/chem.200400893
日期:2005.2.4
a bulky tBu group, rearranged cleanly to cyclopentadienyliridium 15 d at 50 degrees C over 15 h and displayed first-order kinetics. The influence of the alkyl substituent on the mechanisms of iridacycle generation, isomerization, and iridabenzene regioselectivity is discussed.
不对称(Z)-1-烷基-3-(2-碘乙烯基)-2-苯基-1-环丙烯(R = Me(8 a),Et(8 b),iPr(8 c)和tBu的合成(8 d))及其与Vaska配合物[Ir(CO)Cl(PPh3)2]及其三甲基膦类似物[Ir(CO)Cl(PMe3)2]的反应进行了研究。Iridabenzvalene(13/20),irida苯(14/21)和/或eta(5)-环戊二烯基铱配合物(15/22)以适度的产率获得,并通过光谱学手段进行了充分表征。确保了伊立达苯并戊烯13 d和伊立达苯14 a,b,d的X射线结构数据。iridabenzenes ac 14ac在75摄氏度下可稳定保持48 h,14 d,后者具有庞大的tBu基团,在50摄氏度下经过15 h干净地重排成15 d的环戊二烯基铱,并表现出一级动力学。烷基取代基对iridacycle生成机理的影响,