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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HRID 54969Generated: October 28, 2026

Methylhydrazine → 6,7-Dihydro-6-methyl-7-oxo-4-phenylthieno[2,3-d]pyridazine

https://huagongshe.com/reaction/54969

Reaction equation

Participants

RoleNameHCIDCharge
ReactantMethylhydrazineHCID 6061—
Reactant3-Benzoyl-2-thiophenecarboxylic acidHCID 315607—
SolventEthanolHCID 702—
Product6,7-Dihydro-6-methyl-7-oxo-4-phenylthieno[2,3-d]pyridazineHCID 19957037—

Reaction Steps

A solution of 31.2 g (0.134 mol) of 3-benzoyl-2-thiophenecarboxylic acid in 400 mL of ethanol was treated with 9.3 (0.2 mol) of methylhydrazine at room temperature for 18 hours, refluxed 3 hours, cooled and 30.7 g of the product filtered off, mp 174-175.

Provenance & Evidence

DOI10.6084/m9.figshare.5104873.v1
Patent numberUS05624922
Source datasetuspto-grants-1997_04
ORD IDord-308bbf6263cf4b2093ae596f882c148f
Source noteuspto-grants-1997_04