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Recyclization of 4-oxo-1,3-benzothiazinium salts. Synthesis of o-mercaptophenyl-1,2,4-triazoles and metal chelates based on them

✍ Scribed by Yu. I. Ryabukhin; O. B. Korzhavina; A. D. Garnovskii; A. P. Knyazev; P. B. Terent'ev


Publisher
Springer US
Year
1991
Tongue
English
Weight
529 KB
Volume
27
Category
Article
ISSN
0009-3122

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## Abstract 4‐Hydroxy‐2‐oxo‐2__H__‐1‐benzopyran‐3‐carboxaldehydes **2a‐d** are prepared from 4‐hydroxy‐2‐oxo‐2__H__‐1‐benzopyrans **1a‐d** __via__ the Vielsmeyer Haack reaction. The 4‐hydroxy‐2‐oxo‐3‐(3′oxo‐3′‐phenylprop‐1′‐enyl)‐2__H__‐1‐benzopyrans **3a‐d** are obtained from **2a‐d** __via__ the