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
Reactivity of 1-alkynylplatinum(II) complexes towards trialkylboranes
作者:Bernd Wrackmeyer、Angelika Sebald
DOI:10.1016/s0022-328x(97)00319-7
日期:1997.10
of a PtC bond, and formation of an alkynylborate-like intermediate in which a positively charged platinum fragment is coordinated to the CC bond. In most cases, the alkenylplatinumcomplexes of the type 9–13, 28, 30 which result from 1,1-organoboration are not stable, and either η2-alkyne platinum(0) (15–21, 29) or η3-borylalene platinum(0) complexe (22–27) or both are the next products. The proposed
complexes [P]PtCl(CCR) 2a–e in high yield, in which the 1-alkynyl group is in cis position with respect to the phosphorus atom, and one of the C7H7 rings is η2-coordinated to platinum through the central CC bond. Complexes 3a–e of the type [P]Pt(CCR)2 could not be prepared by the reaction of 2 with an excess of the 1-alkynyltin reagents. However, the reaction of 1 with the phosphaneP(C7H7)3 gave compounds