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Rotational isomerism in 5-amino-6-(N-methylformamido)-as-triazin-3(2H)-one

✍ Scribed by Jacques Riand; Michel Tanguy; Marie-Thérèse Chenon; Cherng-Chyi Tzeng; Raymond P. Panzica

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 466 KB
Volume: 28
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260280607

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✦ Synopsis

Abstract

A ^1^H dynamic NMR study of the hindered rotation in 5‐amino‐6‐(N‐methylformamido)‐as‐triazin‐3(2__H__)‐one was conducted. Signals for two rotamers were observed and their proton chemical shifts were assigned. It was found that the rotamer in which the as‐triazine ring is cis to the formyl hydrogen predominates. The free energies of activation for hindered rotations about the N CHO and C NH~2~ bonds were determined by ^1^H NMR line‐shape analysis.

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