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Structural assignment of monothiocarbonohydrazones by 1 H NMR spectroscopy
Author(s) -
Rajendran G.,
Jain Sampat R.
Publication year - 1984
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270220103
Subject(s) - steric effects , substituent , chemistry , nuclear magnetic resonance spectroscopy , spectroscopy , computational chemistry , stereochemistry , physics , quantum mechanics
Analysis of the 1 H NMR spectra of several monothiocarbonohydrazones, some of them synthesized for the first time, shows that they exist as two structural isomers. Whereas, in general, the derivatives of aromatic aldehydes conform to a linear structure, the aliphatic carbonyl derivatives conform to heterocyclic or linear structures, depending on the size of the substituent groups. This dual behaviour is explained in terms of extended conjugation and steric hindrance.