scholarly journals Synthesis and Structure Elucidation of N′-(4-Methoxybenzylidene)-5-methyl-1-phenyl-1H-1,2,3-triazole-4-carbohydrazide

Molbank ◽  
10.3390/m1034 ◽  
2018 ◽  
Vol 2018 (4) ◽  
pp. M1034 ◽  
Author(s):  
Mohammad Alotaibi ◽  
Hanan Mohamed ◽  
Bakr Abdel-Wahab ◽  
Amany Hegazy ◽  
Benson Kariuki ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Single Crystal ◽  
Mass Spectroscopy ◽  
Structure Elucidation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Acid Catalyzed ◽  
Nuclear Magnetic

N′-(4-Methoxybenzylidene)-5-methyl-1-phenyl-1H-1,2,3-triazole-4-carbohydrazide (3) was synthesized in a yield of 88% from an acid-catalyzed reaction of 5-methyl-1-phenyl-1H-1,2,3- triazole-4-carbohydrazide and 4-methoxybenzaldehyde in ethanol under reflux for 2.5 h. The structure of 3 was confirmed by the data obtained from infrared, nuclear magnetic resonance, mass spectroscopy, single crystal X-ray diffraction, and microanalysis.

Tautomerism of bis(2-benzothiazolyl)methanes

1988 ◽  
Vol 66 (6) ◽  
pp. 1467-1473 ◽  
Author(s):  
Carmen Avendaño ◽  
María Teresa Ramos ◽  
José Elguero ◽  
María Luisa Jimeno ◽  
Juana Bellanato ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Magnetic Resonance ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Methyl Derivative ◽  
Model Compounds ◽  
X Ray ◽  
Nuclear Magnetic

Tautomerism of dibenzothiazolylmethane (1) and its C-methyl derivative (2) has been studied by 1H nuclear magnetic resonance, ultraviolet, and infrared spectroscopy using C,C-dimethyl (3) and N-methyl (4) derivatives as model compounds of the "CH" and "NH" forms, respectively. X-ray diffraction analysis of the "fixed" N-methyl derivative 4 shows that it corresponds to the Z-sE isomer 4b2. The CH tautomers are unstable in solution and they slowly isomerize into a mixture of NH tautomers that depends on the solvent and on the C-substituent (H or CH3).

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