Tris(pyrrolyl) phosphine-substituted acetylene-dicobaltcarbonyl complexes:Syntheses, structural characterization, and reactivity studies

Citation
J. Castro et al., Tris(pyrrolyl) phosphine-substituted acetylene-dicobaltcarbonyl complexes:Syntheses, structural characterization, and reactivity studies, ORGANOMETAL, 19(9), 2000, pp. 1704-1712
Citations number
86
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
ORGANOMETALLICS
ISSN journal
0276-7333 → ACNP
Volume
19
Issue
9
Year of publication
2000
Pages
1704 - 1712
Database
ISI
SICI code
0276-7333(20000501)19:9<1704:TPAC>2.0.ZU;2-Y
Abstract
The first tris(pyrrolyl)phosphine-substituted alkyne-dicobaltcarbonyl compl exes have been prepared by reaction of the corresponding dicobalthexacarbon yl complexes with tris(pyrrolyl)phosphine, and their solid-state structures have been studied by X-ray diffraction. In accordance with the strong pi-a cceptor character of the tris(pyrrolyl)phosphine ligand, these complexes pr esent a Pauson-Khand reactivity very similar to that of the parent, unsubst ituted ones. On the other hand, the cobalt-stabilized propargyl cations der ived from tris(pyrrolyl)phosphine-substituted (2-propynol)dicobaltcarbonyl complexes undergo an unprecedented intramolecular Nicholas reaction in whic h one of the pyrrole rings acts as an internal nucleophile, and that gives rise to a new structural type of chelated alkyne-dicobaltcarbonyl complexes .