equiv of H3CB(C6F5)2. The pathway to 1 involves stepwise attack of borane first at the methylene group, followed by attack at the methyl group, which undergoes alkyl/hydride exchange with the second equivalent of HB(C6F5)2. The product of HB(C6F5)2 addition to the methylene ligand, methyl hydride complex Cp2Ta(CH2B(C6F5)2)(μ-H)(CH3), 2, can be intercepted by carrying out the reaction in hexane at low
Cp 2 Ta(CH 2)3与2当量的HB(C 6 F 5)2反应导致生成二酐Cp 2 Ta(CH 2 B(C 6 F 5)2)(μ-H)(H ),1和1当量的H 3 CB(C 6 F 5)2。通往1的途径涉及首先在亚甲基上逐步攻击
硼烷,然后在甲基上逐步攻击
硼烷,然后与第二当量的HB(C 6 F 5)进行烷基/
氢化物交换)2。可以截获HB(C 6 F 5)2加成亚甲基
配体的产物氢化甲基络合物Cp 2 Ta(CH 2 B(C 6 F 5)2)(μ-H)(CH 3),2。通过在低温下在己烷中进行反应,可以使其几乎完全不溶于其中。该复合物在消除一阶分解过程在较高的温度
甲烷(Δ ħ ⧧ = 20.4(5)千卡摩尔- 1和Δ小号⧧ = -2.0(2)卡摩尔- 1 ķ- 1)。该产物是配制成Cp 2 Ta [CH 2 B(C 6 F 5)2 ],3的
硼氢化烯烃络合物,不稳定且不能分离。DFT计算支持其