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61. Usnic acid. Part VI. The synthesis of O-dimethylpyrousnic acid

✍ Scribed by Birch, Harold F. ;Robertson, Alexander

Book ID: 120274413
Publisher: The Royal Society of Chemistry
Year: 1938
Weight: 426 KB
Category: Article
ISSN: 0368-1769
DOI: 10.1039/JR9380000306

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## Abstract The reaction of (+)‐usnic acid (I) with arylhydrazines (II) leads to the fused pyrazole derivatives (III), whilst the reaction with nitrophenylhydrazines (V) gives rise to hydrazones (V).