Abstract
Abstract Asymmetric hydrogenation of dimethyl itaconate catalyzed by the trans-chelating chiral diphosphine ( R , R )-( S , S )-EtTRAP-rhodium complex gave ( S )-dimethyl 2-methylsuccinate with 96% ee. Dimethyl 2-isopropylidenesuccinate, a tetrasubstituted olefin substrate, was also hydrogenated with ( R , R )-( S , S )-BuTRAP-rhodium complex in high enantioselectivity (78% ee), but with opposite enantioselection.
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