Synthesis and Coordination Chemistry of 3a,7a-Azaborindenyl, a New Isoelectronic Analogue of the Indenyl Ligand
作者:Arthur J. Ashe、Hong Yang、Xiangdong Fang、Jeff W. Kampf
DOI:10.1021/om0204944
日期:2002.10.1
The fused-ring diheteroaromatic 3a,7a-azaborindenyl anion (1) has been prepared by a synthesis using the Grubbs ring-closing metathesis. 1 has been converted to the Cp*ZrCl2 complex 2, which closely resembles the corresponding (Ind)Cp*ZrCl2.
Syntheses of Ring-Fused B−N Heteroaromatic Compounds
作者:Xiangdong Fang、Hong Yang、Jeff W. Kampf、Mark M. Banaszak Holl、Arthur J. Ashe
DOI:10.1021/om058048e
日期:2006.1.1
3a,7a-Azaborindene (14) has been prepared by two multistep syntheses using the Grubbs ring-closing metathesis from appropriate B-vinyl,N-allyl-aminoboranes. 14 was deprotonated by KN(SiMe3)2 to give 3a,7a-azaborindenylpotassium (5). The reaction of 5 with Cp*ZrCl3 afforded the corresponding Zr(IV) complex 18, which on activation with excess methylaluminoxane, forms a good catalyst for the polymerization of ethylene. The reaction of 5 with methylene chloride and BuLi gave 4a,8a-azaboranaphthalene (6), which is isoelectronic and isostructural with naphthalene. DFT calculations on 6 gave a structure that is in good agreement with X-ray diffraction data.