Synthesis of 4-hydroxy-4,5-dihydro-1,2,4-triazol-5-ones
✍ Scribed by A. Aykut İkizler; Kemal Sancak
- Publisher
- Springer Vienna
- Year
- 1992
- Tongue
- English
- Weight
- 300 KB
- Volume
- 123
- Category
- Article
- ISSN
- 0026-9247
No coin nor oath required. For personal study only.
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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
## Abstract Thirty 3‐substituted‐ and 3,4‐disubstituted‐4,5‐dihydro‐1,2,4‐triazol‐5‐ones (seven being new compounds) were synthesized and their proton magnetic resonance spectra were measured in trifluoroacetic acid (TFA). The protonation shifts observed on comparison of the spectra run in DMSO‐__d