Bifunctional Lewis Acids. Synthesis and Olefin Polymerization Chemistry of the 1,1-Di[bis(perfluorophenyl)boryl]alkenes RCHC[B(C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>]<sub>2</sub> (R = <i>t</i>-Bu, C<sub>6</sub>H<sub>5</sub>, C<sub>6</sub>F<sub>5</sub>)
作者:Katrin Köhler、Warren E. Piers、Adam P. Jarvis、S. Xin、Y. Feng、A. M. Bravakis、Scott Collins、William Clegg、Glenn P. A. Yap、Todd B. Marder
DOI:10.1021/om980259e
日期:1998.8.1
The synthesis and characterization, including crystallographic analysis, of the bifunctional boranes RCHC[B(C6F5)2]2 (R = t-C4H9, 1a; C6H5, 1b; C6F5, 1c) by regioselective hydroboration of the corresponding 1-boraalkynes using HB(C6F5)2 are reported herein. Compounds 1a and 1b have been screened as cocatalysts for ethylene polymerization in the presence of Cp2ZrMe2 (3) under a variety of conditions
双官能硼烷的合成和表征,其中包括结晶学分析,RCH C [B(C 6 ˚F 5)2 ] 2(R =吨-C 4 ħ 9,图1A ;Ç 6 ħ 5,1B ;Ç 6 ˚F 5,本文报道了使用HB(C 6 F 5)2通过相应的1-硼烷炔的区域选择性氢硼化进行的1c)的报道。化合物1a和1b在多种条件下,在Cp 2 ZrMe 2(3)的存在下,已筛选出作为乙烯聚合的助催化剂。NMR光谱研究表明的Cp 2 Zr的[η 2 -Bu吨C⋮CB(C 6 F 5)2 ](4a),Cp 2 ZrMe(C 6 F 5),有机硼烷Me 2 BC 6 F 5和甲烷气体是1a与3在甲苯中反应形成的最终产物在室温下溶解。通过变温NMR研究已经阐明了这种转化的化学计量机制。配合物4a和MeB(C 6 F 5)2(7)分别制备,并分别用作乙烯聚合催化剂和助催化剂。单独或在另外的1a的存在下,化合物4a对于乙烯聚合是惰性的。但是,Cp
The reaction of boron alkynes and boron azides leads to rare N3BC heterocycles resulting from aromaticCHactivation of benzene and toluene. While subsequent treatment with PMe3 gave the PB adduct with the exocyclic boron, reaction with PtBu3 effected deprotonation of the heterocycle to give the corresponding phosphonium salt.