Ligand Exchange Reactions of Triphospholyl Metal Carbonyl Complexes

Journal article


Publication Details

Author(s): Zenneck U, Heinemann F, Pritzkow H, Zeller M
Journal: Organometallics
Publication year: 2001
Volume: 20
Pages range: 2905-2915
ISSN: 0276-7333


Abstract

Utilizing 1-triphenylstannyl-3,5-di(tert-butyl)-1,2,4-triphosphole (2) as the transfer reagent for the 1,2,4-triphospholyl ligand, the new cobalt dicarbonyl complex (η5-t-Bu2C2P3)(CO) 2Co (4) has been prepared. The reactivity of 4 and that of triphosphacymantrene (η5-t-Bu2C2P3) (CO)3Mn (3) toward carbonyl exchange have been investigated. When 3 or 4 are photolyzed in the presence of phosphanes the mono- and disubstituted complexes (η5-t-Bu2C2P3)(CO) (PR3)Co (R = Et (5), Ph (6)) and (η5-t-Bu2C2P3)(CO) (PMe3)2Mn (7) obtained. In the absence of additional ligands, the irradiation of 3 in n-hexane results in the formation of the dinuclear rac and meso complexes {μ[1:1-5-η-t-Bu2C2P3](CO)2Mn} 2 (8a and 8b). Under thermal conditions the carbonyl ligands of both 3 and 4 are replaced by isonitrile ligands to yield (η5-t-Bu2C2P3) (CN-Cy)2Co (9), (η5-t-Bu2C2P3)(CO)(CN-Cy)Co (10), and (η5-t-Bu2C2P3)- (CO)2(CN-Cy)Mn (11), respectively. The substances have been fully characterized including X-ray structural analysis for the complexes 4, 6, 7, 8a, 8b, and 9. Under both photochemical and thermal conditions the complexes 3 and 4 are much more reactive than their phosphorus-free cyclopentadienyl analogues. In contrast with cymantrene, triphosphacymantrene (3) seems to react via an associative pathway.


FAU Authors / FAU Editors

Heinemann, Frank Dr.
Lehrstuhl für Anorganische und Allgemeine Chemie
Zenneck, Ulrich Prof. Dr.
Professur für Anorganische Chemie


External institutions
Ruprecht-Karls-Universität Heidelberg


How to cite

APA:
Zenneck, U., Heinemann, F., Pritzkow, H., & Zeller, M. (2001). Ligand Exchange Reactions of Triphospholyl Metal Carbonyl Complexes. Organometallics, 20, 2905-2915.

MLA:
Zenneck, Ulrich, et al. "Ligand Exchange Reactions of Triphospholyl Metal Carbonyl Complexes." Organometallics 20 (2001): 2905-2915.

BibTeX: 

Last updated on 2019-17-01 at 09:38