ISSN:
0021-8383
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Stereochemical Investigations of Heterocyclic Compounds. XII. Structural Investigations of 1-(2-Amino-1-cyano-2-thio)ethene Pyridinium YlidesTwo isomerization processes were found by 1H-d-n. m. r. characterized by ΔG* = 67 ± 4 KJ/mol for E- Z-isomerization and ΔG* = 46 ± 5 KJ/mol for the hindered rotation of the pyridine substituent in 1a. The structure of 1b was solved by direct method. Crystals are monoclinic space group P21/n, a = 13.682(3), b = 9.452(1), C = 19.713(6) Å, β = 96.42(2)°, V = 2533.3 Å3, Dx = 1.328 Mg · m-3, Z = 8. Both E- and Z-isomeres of 2b are found in the crystal lattice. The amino—C distance with 1.369 (1,387) Å is shorter than the theoretical single bond distance. The formal —C=C— double bond with 1.377 (1.391) Å is considerably longer than 1.337 Å observed in the some alkenes.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/prac.19833250212
