All articles of this category Indium mediates the coupling of ethyl 4-bromocrotonate with carbonyl compounds in water to give the corresponding β-hydroxy-α-vinyl carboxylates in good yield and high anti -diastereoselectivity. Furthermore, the use of lanthanide triflate increases the rate and selectivity of the reactions. Lanthanum trifluoromethanesulfonate - indium - alkyl bromocrotonate
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Diana et al. (1996) studied this question.