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Formation and reactivity of the cyclometallated N-heterocyclic carbene complexes Ru(NHC)'(dppe)(CO)H


Reference:

Page, M. J., Mahon, M. F. and Whittlesey, M. K., 2011. Formation and reactivity of the cyclometallated N-heterocyclic carbene complexes Ru(NHC)'(dppe)(CO)H. Dalton Transactions, 40 (31), pp. 7858-7865.

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Official URL:

http://dx.doi.org/10.1039/c1dt10299k

Abstract

Thermolysis of [Ru(PPh(3))(dppe)(CO)HCl] (dppe = 1,2-bis(diphenylphosphino)ethane) with the N-heterocyclic carbenes I(i)Pr(2)Me(2) (1,3-diisopropyl-4,5-dimethyl-imidazol-2-ylidene), IEt(2)Me(2) (1,3-diethyl-4,5-dimethyl-imidazol-2-ylidene) or ICy (1,3-dicyclohexylimidazol-2-ylidene) gave the cyclometallated carbene complexes [Ru(NHC)'(dppe)(CO)H] (NHC = I(i)Pr(2)Me(2), 4; IEt(2)Me(2), 5; ICy, 6). Dissolution of 4 in CH(2)Cl(2) or CHCl(3) gave the trans-Cl-Ru-P complex [Ru(I(i)Pr(2)Me(2))'(dppe)(CO)Cl] (7), which converted over hours at room temperature to the trans-Cl-Ru-CO isomer 7'. Chloride abstraction from 7 by NaBPh(4) under an atmosphere of H(2) produced the cationic mono-hydride complex [Ru(I(i)Pr(2)Me(2))(dppe)(CO)H][BPh(4)] (9), which could also be formed by protonating 4 with 1 eq HBF(4)center dot OEt(2). Treatment of 4 with excess HBF(4)center dot OEt(2) followed by extraction into MeCN produced the dicationic acetonitrile complex [Ru(I(i)Pr(2)Me(2))(dppe)(CO)(NCMe)(2)][BF(4)](2) (10). The structures of 6, 7, 7' and 10 have been determined by X-ray crystallography.

Details

Item Type Articles
CreatorsPage, M. J., Mahon, M. F. and Whittlesey, M. K.
DOI10.1039/c1dt10299k
DepartmentsFaculty of Science > Chemistry
RefereedYes
StatusPublished
ID Code25268

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