Selective conversion of an ethylene to an ethylidene ligand in reactions of a hydrido(ethylene) complex of tantalum with iodofluorocarbons.: Molecular structure of [Ta(η5-C5H5)2(η1-CHCH3)I]

被引：17

作者：

Hughes, RP ^{[1
]}

Maddock, SM

Rheingold, AL

Guzei, IA

机构：

[1] Dartmouth Coll, Dept Chem, Burke Lab 6128, Hanover, NH 03755 USA

[2] Univ Delaware, Dept Chem, Newark, DE 19716 USA

来源：

POLYHEDRON | 1998年 / 17卷 / 07期

基金：

美国国家科学基金会;

关键词：

ethylene; ethylidene ligand; iodofluorocarbons;

D O I：

10.1016/S0277-5387(97)00489-0

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Reactions of [TaCp2(C2H4)H] (3) with perfluoro-n-butyl iodide or perfluorobenzyl iodide cleanly yield the iodo(ethylene) complex [TaCp2(C2H4)I] (4) together with the hydrofluorocarbons CF3CF2CF2CF2H and C6F5CF2H, respectively. In sharp contrast, reactions of 3 with perfluoro-iso-propyl iodide or pentafluorophenyl iodide cleanly afford the isomeric iodo(ethylidene) complex [TaCp2(CHCH3)I] (5). No interconversion of 4 and 5 is observed under these reaction conditions, indicating that each is formed under conditions of kinetic control. The structure of 5 has been confirmed by X-ray crystallography. Similar results to give much more thermally sensitive products are observed for the niobium analogues. Possible mechanisms for these highly selective reactions are discussed. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：1037 / 1043

页数：7

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