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New isomeric N-substituted hydrazones of 2-, 3- and 4-pyridinecarboxaldehydes and methyl-3-pyridylketone

✍ Scribed by Elzbieta Wyrzykiewicz; Alfred Blaszczyk

Publisher
Journal of Heterocyclic Chemistry
Year
2000
Tongue
English
Weight
405 KB
Volume
37
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

Twelve compounds unknown in the literature N‐(E)‐2‐stilbenyloxymethylenecarbonyl substituted hydrazones of 2‐, 3‐ and 4‐pyridinecarboxaldehydes, as well as methyl‐3‐pyridylketone have been prepared. The stereochemical behavior of these compounds in dimethyl‐d~6~ sulfoxide solution has been studied by ^1^H NMR technique. The E geometrical isomers and cis/trans amide conformers have been found for N‐substituted hydrazones 1–12. EI induced mass spectral fragmentation of these compounds were also investigated. The data obtained create the basis for distinguishing isomers.

📜 SIMILAR VOLUMES

New isomeric N-substituted hydrazones of
New isomeric N-substituted hydrazones of 2-, 3-and 4-pyridinecarboxaldehydes
✍ Elżbieta Wyrzykiewicz; Dorota Prukała 📂 Article 📅 1998 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 344 KB

## Abstract Eighteen compounds unknown in the literature, __N‐(E__)‐stilbenyloxyalkylcarbonyl‐ and __N‐(E__)‐stilbenyloxyalkylcarbonylaminoalkylcarbonyl‐substituted hydrazones of 2‐, 3‐ and 4‐pyridinecarboxaldehydes have been prepared. The stereochemical behavior of these compounds in dimethyl‐d~6~

EIMS study of new isomeric N-substituted
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## Abstract EI induced mass spectral fragmentations of twelve new hydrazones of 2‐(3‐ and 4‐)‐pyridinecarboxaldehydes and hydrazides of (__E__)‐stilbenyloxyacetic acid as well as __N__‐(__E__)‐stilbenyloxyalkylcarbonyl substituted amino acids were investigated. Fragmentations pathways are proposed

N-Methyl chemical shifts in some 2-, 3-
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✍ L. W. Deady; G. D. Willett 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 200 KB

## Abstract The chemical shifts of the __N__‐methyl group in a series of 2‐, 3‐ and 4‐substituted __N__‐methylpyridinium salts have been measured in DMSO solution. The shift is primarily affected by resonance interaction between the substituent and aza group, and the results suggest that the resona