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Royal Society of Chemistry, Organic Chemistry Frontiers, 9(1), p. 1091-1095, 2014

DOI: 10.1039/c4qo00193a

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Addition of carbon nucleophiles to hemiaminals promoted by a Lewis acidic polyoxotungstate

Journal article published in 2014 by Wen-Jing Xuan, Candice Botuha, Bernold Hasenknopf, Serge Thorimbert ORCID
This paper is available in a repository.
This paper is available in a repository.

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Abstract

A Lewis acidic hafnium(IV) ion incorporated in a polyoxotungstate (POM/Hf) was successfully employed as recoverable catalyst in the nucleophilic addition of carbon nucleophiles, such as silyl enol ethers, silyl ketene acetals, β-diketones and β-diketoesters, to unprotected hydroxy aminal at room temperature. The corresponding α-substituted heterocycles were obtained in good yields and the recovered POM catalyst could be reused up to three times without significant loss of activity