Participants
| Role | Name | HCID | Charge |
|---|
| Reactant | Sulfuric Acid | HCID 1118 | — |
| Reactant | HCID 178524458 | HCID 178524458 | — |
| Product | HCID 178514904 | HCID 178514904 | 64.1% |
Reaction Steps
A mixture of 0.5 g of 2-[4-(5-1H-tetrazolyl)phenoxy]nicotinic acid and 5 ml of concentrated sulfuric acid is heated at 180° C for 2.5 hours, and then poured into ice water. The crystalline precipitate is filtered off, washed with water and with methanol and recrystallized from dimethylformamide to give 0.3 g of 7-(5-1H-tetrazolyl)-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine melting at above 300° C.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
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| Patent number | US04085111 |
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| Source dataset | uspto-grants-1978_04 |
|---|
| ORD ID | ord-7e79680bb98c46d297788545b43ea8a1 |
|---|
| Source note | uspto-grants-1978_04 |
|---|
