EARLY TRANSITION-METAL CATALYZED-HYDROBORATION OF ALKENES

被引：139

作者：

BIJPOST, EA ^{[1
]}

DUCHATEAU, R ^{[1
]}

TEUBEN, JH ^{[1
]}

机构：

[1] UNIV GRONINGEN,DEPT CHEM,GRONINGEN CTR CATALYSIS & SYNTH,9747 AG GRONINGEN,NETHERLANDS

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 1995年 / 95卷 / 02期

关键词：

ALTERNATIVE LIGAND SYSTEMS; EARLY TRANSITION METALS; HOMOGENEOUS CATALYSIS; HYDROBORATION;

D O I：

10.1016/1381-1169(94)00013-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A variety of well-defined early transition metal complexes were tested as catalyst for the hydroboration of l-hexene using catecholborane as boration agent. The variations applied concerned both metal (Y, La, Ti, Zr) and spectator ligand system (bis(cyclopentadienyl), bis(pentamethylcyclopentadienyl), bis(benzamidinate), cyclopentadienyl-benzamidinate, cyclopentadienyl-aryloxy, and cylopentadienyl-amido). Most systems proved to be catalytically active (anti-Markovnikov regioselectivity, side reactions negligible), but the observed activity was in all cases lower than reported for Cp*2LaCH(SiMe(3))(2) [1]. Inactivation of the catalyst by catecholborane or Lewis base-metal complex induced disproportionation of catecholborane appeared to compete effectively with the catalytic conversion, thus leading to inefficient catalytic performance and complicated product mixtures. Systems with bidentate, cyclopentadienyl ligands with a pending anionic (aryloxy, amido) function showed a moderate catalytic activity but excellent catalyst stability and open up interesting perspectives for further exploration.

引用

页码：121 / 128

页数：8

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