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Zn complexes of proline, lysine and arginine are efficient catalysts for the aldol addition of p-nitrobenzaldehyde and acetone in aqueous medium, giving quantitative yields and enantiomeric excesses up to 56% with 5 mol% of the catalysts at room temperature. C H E M . C O M M U N . , 2 0 0 3 , 1 0 9 0 -1 0 9 1doi:10.1039/b301117h pmid:12772917 fatcat:2dkgopqzhnd3th674t7q64kjyq