Buta-1,3-diene-2,3-dicarboxylic acid is smoothly hydrogenated in the presence of a ruthenium–(R)-binap complex as a catalyst via two consecutive 1,2-hydrogen additions, giving rise to (S,S)-2,3-dimethylsuccinic acid with 98% diastereoisomeric excess and 96% enantiomeric excess.
H. Muramatsu, H. Kawano, Y. Ishii, M. Saburi and Y. Uchida, J. Chem. Soc., Chem. Commun., 1989, 769 DOI: 10.1039/C39890000769
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