Fischer, E. published the artcileStereochemical studies of heterocyclic compounds. XII. Crystal and molecular structure of 1-(2-amino-1-cyano-2-thioethenyl)pyridinium ylides, Related Products of pyridine-derivatives, the publication is Journal fuer Praktische Chemie (Leipzig) (1983), 325(2), 261-8, database is CAplus.
E/Z Isomerization and hindered rotation of the pyridine ring were examined in I (R = Me, R1 = Et). The former process had ΔG* = 67 kJ/mol; the latter had ΔG* = 46 kJ/mol. Crystallog. data, bond lengths, and bond angles were determined for I (R = H, R1 = Ph); both E and Z isomers exists in the crystal. The C:C double bond is considerably longer than those in some olefins.
Journal fuer Praktische Chemie (Leipzig) published new progress about 17281-59-3. 17281-59-3 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitrile,Salt, name is 1-(Cyanomethyl)pyridin-1-ium chloride, and the molecular formula is C7H7ClN2, Related Products of pyridine-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem