Abstract

Use of magnesium(II) species as Lewis acid catalysts for ­various functional group transformations is well documented. [1] Of these, magnesium halides are the most useful. Ready availability and ease of preparation prompted the frequent use of MgBr2·OEt2 in various organic transformations. The oxophilic and coordinating nature of MgBr2·OEt2 has been demonstrated through its use as a bidentate chelating Lewis acid in a number of chelation-controlled reactions such as cycloadditions, [2] asymmetric aldol reactions, [3] rearrangements, [4] radical additions, [5] [6] ­hydrogen transfer reactions, [7] stereoselective reductions, [8] and anomerizations. [9]

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