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Organometallic Intramolecular π‐Olefin‐Metal Coordination Compounds
Author(s) -
Omae Iwao
Publication year - 1982
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198208891
Subject(s) - intramolecular force , ligand (biochemistry) , chemistry , 2 norbornyl cation , ring (chemistry) , double bond , metal , olefin fiber , ring strain , stereochemistry , coordination sphere , coordination complex , medicinal chemistry , transition metal , organometallic chemistry , polymer chemistry , crystallography , catalysis , organic chemistry , crystal structure , receptor , biochemistry
In this review article complexes of the type X n M—R are dealt with in which a σ‐bonded organic ligand R is additionally linked by a π‐bond with the metal M. In other words, the complexes contain metallacycles with three and a half, four and a half, five and a half members, etc. Well‐Known five and a half membered ring systems are those with 4‐pentenyl, 1,4‐pentadienyl, norbornyl norbornenyl, cyclooctenyl, and endo ‐dicyclopentadienyl ligands. Metallacycles of this size are strain‐free and stable. Donor ligands such as amines and phosphanes can displace the coordinated double bond of the π‐ligand from the metal. This CC double bond is lengthened from ca. 133 pm to 136–146 pm by the coordination.