All articles of this category Optically active oxo(salen)manganese(V) complexes were found to serve as chiral Lewis acid catalysts. Although oxo(salen)manganese(V) complexes are strong oxidizing agents, their oxygen atom transfer activity is suppressed at -78°C. For example, Diels-Alder reaction between cyclopentadiene and α-bromoacrolein was promoted by optically active oxo(salen)manganese(V) complex ( 10 ) to give the corresponding adduct of 68% ee with high exo selectivity. (salen)manganese(III) complex - Lewis acid catalyst - Diels-Alder reaction - oxo (salen)manganese(V) complex
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Yamashita et al. (1995) studied this question.