HuagongsheHuagongshe Chemistry Print Report · For research reference only
HRID 259728Generated: October 25, 2026
Acetic Anhydride → 1,3-Dimethyl-1H-indazole-4,5-dicarboxylic anhydride
https://huagongshe.com/reaction/259728
Participants
| Role | Name | HCID | Charge |
|---|
| Reactant | Acetic Anhydride | HCID 7918 | — |
| Reactant | 1,3-dimethyl-1H-indazole-4,5-dicarboxylic acid | HCID 22402946 | — |
| Product | 1,3-Dimethyl-1H-indazole-4,5-dicarboxylic anhydride | HCID 54189584 | — |
Reaction Steps
A mixture of 1,3-dimethyl-1H-indazole-4,5-dicarboxylic acid (6.30 g, 26.9 mmol) and acetic anhydride is stirred at reflux temperature for 3 hours, cooled to 5° C. and filtered. The filter cake is air-dried to give the title product as chartreuse needles (4.80 g, 82.5%), mp 214°-215.5° C.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
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| Patent number | US05523279 |
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| Source dataset | uspto-grants-1996_06 |
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| ORD ID | ord-5182e73af48c499c9ebc0f2917465cda |
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| Source note | uspto-grants-1996_06 |
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