Alcohol-O,O'-dibenzoyl-(2R,3R)-tartaric acid complexes.

Structures of chiral and achiral alcohol-O,O'-dibenzoyl-(2R,3R)-tartaric acid (DBTA) complexes were investigated by single-crystal X-ray diffraction (seven new crystal structures were determined). The complexes contain DBTA and chiral alcohol in 1:1, DBTA and achiral alcohol in 1:2 host-guest stoichiometry. The hydrogen bonding structures of chiral alcohol-DBTA and achiral alcohol-DBTA complexes are different, but within a subclass they are isostructural ones.

Investigation of the physicochemical basis of enantiomeric enrichment: The example of alpha-phenylethylamine with achiral dicarboxylic acids.

We investigated the enantiomeric enrichment of enantiomeric mixtures of alpha-phenylethylamine by achiral dicarboxylic acids. As achiral agents oxalic, malonic, fumaric, and phthalic acids were used. The results of the enantiomeric enrichment via partial salt formation followed by distillation were compared with enantiomer separation via crystallization of the neutral salt.