organic compounds
Open access
The title compound, C22H22FN3, exists as a zwitterion with the negative charge on the dicyanomethanide group and the positive charge on the pyridinium N atom. The molecule adopts a Z conformation about the central C=C bond. The dihedral angle between the pyridinium and benzene rings is 65.65 (5)°. Weak C—HN hydrogen bonding is present in the crystal structure.
organic compounds
Open access
The asymmetric unit of the title compound, C40H60O5S, comprises two diastereomers related, except for the chiral camphor groups, by a pseudo-inversion centre. In both diasteromers, the camphor sulfate moiety maintained the absolute configuartion (R,S) of the precursor. However, the absolute configurations at the methine C atoms are of opposite chirality. Both molecules reveal intramolecular O—HO hydrogen bonds, whereas van der Waals interactions define the crystal packing.