In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2010, No. 29 ( 2010-10), p. 4602-4610
Abstract:
The iridium complex [Ir(acac)(η 2 ‐coe) 2 ] ( 1 ) has been easily prepared by the addition of Tl(acac) to a suspension of [Ir(μ‐Cl)(η 2 ‐coe) 2 ] 2 in hexane. Complex 1 has been characterized fully including an X‐ray diffraction study. It is moderately stable and is a useful precursor to a number of different acetylacetonato(phosphane)iridium complexes via addition of monodentate and bidentate phosphanes. Reactions proceeded at room temperature to give high yields of the desired square planar phosphane complexes [Ir(acac)(P)] ( 2 : P = 2 PPh 3 , 3 : P = 2 PMePh 2 , 4 : P = dppm, 5 : P = dppe, 6 : P = dppp, 7 : P = dppb, 8 : P = dppf, 9 : P = dcpe) except for those involving dppe, which gave a complicated mixture of products. Complex [Ir(acac)(dppe)] ( 5 ) was prepared in a microwave reactor at 125 °C. All complexes prepared in this study were efficient in the intramolecular catalyzed cyclization of4‐pentynoic acid to give exclusive formation of the exocyclic γ‐methylene‐γ‐butyrolactone. Complex 1 was found to be the most active and selective catalyst precursor for the intramolecular cyclization of both 4‐pentynoic acid and 5‐hexynoic acid.
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2010:29
DOI:
10.1002/ejic.201000655
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
1475009-0
Permalink