RETARDATION EFFECT OF TRIMETHYL PHOSPHITE ON CHELATE RING-CLOSURE OF 2,2'-BIPYRIDINE (BIPY) IN CIS-[W(CO)4(P(OME)3)-(BIPY)]

1994-08-07
KAYRAN, C
Özkar, Saim
SULTAN, WIM
In order to study the effect of a donor ligand on the chelate ring-closure reaction of a diimine ligand co-ordinated in monodentate fashion, cis-[W(CO)4{P(OMe)3}(bipy)] was synthesised from [W(CO)5{P(OMe)5}] and 2,2'-bipyridine (bipy) by using a newly developed method and characterized by means of IR and NMR spectroscopies. The complex was found to undergo neither cis-->trans isomerization nor chelation thermally up to 150-degrees-C. However the ring-closure reaction occurs photochemically. Thus irradiation of the complex yielded fac-[W(CO)3{P(OMe)3}(bipy)] which was also isolated and characterized. The extraordinary retardation effect of trimethyl phosphite on the ring-closure reaction of the 2,2'-bipyridine ligand is attributed to the reduction in substitution lability of the CO groups in the complex upon introduction of the phosphite donor ligand.

Citation Formats
C. KAYRAN, S. Özkar, and W. SULTAN, “RETARDATION EFFECT OF TRIMETHYL PHOSPHITE ON CHELATE RING-CLOSURE OF 2,2′-BIPYRIDINE (BIPY) IN CIS-[W(CO)4(P(OME)3)-(BIPY)],” JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, no. 15, pp. 2239–2239, 1994, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36128.