energy. The electonic and vibrational features of both structure types were probed. The IR spectrum of 2 was best matched by the eta2-B,H conformer of 2SiBu. In related computations pertaining to 3, small R models favored the oxidative addition of a BCl bond, while with R = SitBu3 (3SiBu), an excellent match with its X-ray crystal structure revealed the critical steric influence of the silox ligands.
用
BH3.THF和BCl2Ph处理(silox)3Ta(1,silox = tBu3SiO),得到(silox)3Ta( )(2)和(silox)3Ta(eta2-B,Cl-BCl2Ph)(3)两种都非常稳定的Ta(III)化合物。NMe3和
乙烯未能从2中除去 ,通过1H NMR可变温度研究未发现 与 .THF-d8交换的迹象。将 .THF添加到(silox)3TaH2中可得到氢化
硼氢化物(silox)3HTa(eta3-
BH4)(5),其热分解释放出H2生成2。将2暴露于D2可以制备同位素异构体(silox) 3Ta( -nDn)(n = 0,2; 1,2-D; 2,2-D2; 3,2-D3)用于
化学位移研究的同位素扰动,但这些未能区分``逆加合物''(即(silox)3Ta-> )或(silox)3Ta(eta2-B,H- )形式的2。计算模型(RO)3Ta( )(R