SYNTHESIS AND REACTIVITY OF (ETA-3-ALLYL)(ETA-5-PENTAMETHYLCYCLOPENTADIENYL)COBALT(II) AND ITS DERIVATIVES

被引：24

作者：

NEHL, H

机构：

[1] Max-Planck-Institut Für Kohlenforschung, Mülheim, W-4330

来源：

CHEMISCHE BERICHTE-RECUEIL | 1993年 / 126卷 / 07期

关键词：

COBALT(II); (ETA-3-ALLYL)(ETA-5-PENTAMETHYLCYCLOPENTADIENYL); COMPLEXES; CYCLODIMERIZATION AND CYCLOTRIMERIZATION REACTIONS; CYCLOADDITION REACTIONS; ALLYL COMPLEXES;

D O I：

10.1002/cber.19931260704

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Reaction of (eta5-pentamethylcyclopentadienyl)cobalt(II) chloride (1) with allyllithium- or allylmagnesium compounds leads to new (eta3-allyl)(eta5-pentamethylcyclopentadienyl)cobalt(II) complexes 2a-d. Complex 2a reacts with acetonitrile by oxidative addition of a methyl group to cobalt to form 5. With alkynes complexes with cyclodimerisized or -trimerisized alkynes as ligands are formed, e.g. the tetraphenylcyclobutadiene complex 6 from 2a and tolan and the hexamethylbenzene complex 8 from 2a and 2-butyne. Reaction with phenylethyne catalytically leads to triphenylbenzene 10. The complexes 2a-d are oxidized by iodine and bromine to Co(III) iodides 12a-d and bromides 14a and b, and by ferricenium tetrafluoroborate to the tetrafluoroborates 13a-c. The tetrafluoroborates give with nitriles stable complexes (nitrile-coordinated end-on to Co), with alkynes substituted cyclopentadienyl ligands coordinated to Co are formed by cycloaddition of the allyl group and the alkyne.

引用

页码：1519 / 1527

页数：9

共 31 条

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