Structural assignment of monothiocarbonohydrazones by1H NMR spectroscopy
摘要:
AbstractAnalysis of the 1H 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.
Structural assignment of monothiocarbonohydrazones by1H NMR spectroscopy
作者:G. Rajendran、Sampat R. Jain
DOI:10.1002/mrc.1270220103
日期:1984.1
AbstractAnalysis of the 1H 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.
Synthesis and steric structure of N″-(arylmethylidene)-N″′-(1-methyl-3-phenylprop-2-yn-1-ylidene)thiocarbonohydrazides
作者:T. E. Glotova、M. Yu. Dvorko、N. N. Chipanina、A. I. Albanov、L. V. Sherstyannikova、O. N. Kazheva、A. N. Chekhlov、O. A. D’yachenko
DOI:10.1134/s1070428008010144
日期:2008.1
Thiocarbonohydrazones derived from aromatic aldehydes reacted with 4-phenylbut-3-yn-2-one in aqueous acetic acid (20°C, 2 h) to produce previously unknown N″-[(E-s-cis)-arylmethylidene]-N″′-[(Z-s-trans)-1-methyl-3-phenylprop-2-yn-1-ylidene]thiocarbonohydrazides with high chemo-, regio-, and stereoselectivity. The steric structure of N″-[(E-s-cis)-benzylidene]-N″′-[(Z-s-trans)-1-methyl-3-phenylprop-2-yn-1-ylidene]thiocarbonohydrazide in crystal and in solution was studied by X-ray analysis and IR and NMR spectroscopy.