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DOI: 10.1039/A700380C (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 3525-3529

Epoxide ring opening catalysed by imidochromium complexes[hair space]‡

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Wa-Hung Leung, Man-Ching Wu, Joyce L. C. Chim, Man-Tat Yu, Hong-wei Hou, Lam-Lung Yeung, Wing-Tak Wong and Yu Wang

Abstract

tert-Butylimidochromium complexes catalysed ring opening of epoxides by SiMe3(N3) to give azidohydrins in good yields. The proposed mechanism for the chromium-mediated epoxide azidolysis involves the intermediacy of a chromium–azide species which delivers nucleophilic azide to the epoxide substrate. The azido complexes [{Cr(NBut)2Cl}2µ-N3)2] 1 and [Cr(ButN[double bond, length half m-dash]NN[double bond, length half m-dash]NSiMe3)(N3)Cl2] 2 have been isolated in the reactions of SiMe3(N3) with [Cr(NBut)2Cl2] and [Cr(NBut)Cl3(dme)] (dme = 1,2-dimethoxyethane), respectively. The structure of complex 1 has been established by X-ray crystallography. The mean Cr–N (imide) and Cr–N (azide) distances are 1.605 and 2.061 Å, respectively. Reaction of [Cr(NBut)Cl3(thf[hair space])2] (thf = tetrahydrofuran) with (S,S[hair space])-diop {4,5-[bis(diphenylphosphino)methyl]-2,2-dimethyl-1,3-dioxolane} gave the dimeric complex [{Cr(NBut)Cl3}2{µ-(S,S[hair space])-diop}], which has been characterised by X-ray crystallography. The Cr–N and Cr–P distances are 1.593(9) and 2.449(4) Å, respectively.

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