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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Additions of Organomagnesium Halides to α-Alkoxy Ketones: Revision of the Chelation-Control Model.
Organic Letters 2017 July 8
The chelation-control model explains the high diastereoselectivity obtained in additions of organometallic nucleophiles to α-alkoxy ketones but fails for reactions of allylmagnesium halides. Low diastereoselectivity in ethereal solvents results from no chelation-induced rate acceleration. Additions of allylmagnesium bromide to carbonyl compounds are diastereoselective using CH2 Cl2 as the solvent even though rate acceleration is still absent. Stereoselectivity likely arises from the predominance of the chelated form in solution. Therefore, a revised chelation-control model is proposed.
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