Add time:09/07/2019 Source:sciencedirect.com
The asymmetric dihydroxylation of p-methoxybenzoate esters of p-methoxyphenyl ethers of 2-hydroxymethyl-1,3-butadienes or 2-hydroxyethyl-1,3-butadienes proceeds with excellent position and enantioselectivity using bis-cinchona alkaloid catalysts. The regioselectivity of these reactions is strongly influenced by binding interactions between the aromatic ether or ester group and the catalyst as predicted from a previously proposed transition state model.
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