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A series of C 2 -symmetric and asymmetric chiral thiourea derivatives were synthesized from commercial l-phenylalanine. All of the new compounds have been fully characterized by IR, 1 H NMR, 13 C NMR, MS spectra and elemental analyses. The chiral thioureas were used as chiral ligands in the catalytic enantioselective ethylation of aldehydes with diethylzinc, the corresponding...
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