Synthesis, crystal structure and catalytic properties of (p-cymene)ruthenium(II) azophenol complexes: azophenyl to azophenol conversion by oxygen insertion to a ruthenium---carbon bond

Rath, Rakesh K. ; Nethaji, Munirathinam ; Chakravarty, Akhil R. (2001) Synthesis, crystal structure and catalytic properties of (p-cymene)ruthenium(II) azophenol complexes: azophenyl to azophenol conversion by oxygen insertion to a ruthenium---carbon bond Journal of Organometallic Chemistry, 633 (1-2). pp. 79-84. ISSN 0022-328X

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00223...

Related URL: http://dx.doi.org/10.1016/S0022-328X(01)01055-5

Abstract

Azophenol complexes of formulation [(η6-p-cymene)RuCl(Ln)] (1-6, n=1-6) were prepared by two synthetic methods involving either an oxygen insertion to the Ru---C bond in cycloruthenated precursors forming complexes 1 and 2 or from the reaction of [{(η6-p-cymene)RuCl}2(μ-Cl)2] with azophenol ligands (HL3-HL6) in the presence of sodium carbonate in CH2Cl2. The molecular structure of the 1-(phenylazo)-2-naphthol complex has been determined by X-ray crystallography. The complex has a η6-p-cymene group, a chloride and a bidentate N,O-donor azophenol ligand. The complexes have been characterized from NMR spectral data. The catalytic activity of the complexes has been studied for the conversion of acetophenone to the corresponding alcohol in the presence of KOH and isopropanol. Complexes 4 and 6 having a methoxy group attached to the ortho-position of the phenylazo moiety and 2 with a methyl group in the meta-position of the phenolic moiety show high percentage conversion (>84%).

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Arene ruthenium; Crystal structure; Oxygen insertion; Azophenol ligands; Transfer hydrogenation; Catalysis
ID Code:6360
Deposited On:20 Oct 2010 11:04
Last Modified:27 May 2011 05:13

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