Y. Yokoyama, Yuko Kurimoto, Yasuyo Saito
Jan 8, 2004
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0
Influential Citations
7
Citations
Journal
Chemistry Letters
Abstract
Ethyl 4-formyl-1,3-dimethylpyrazole-5-carboxylate showed coloration upon 366-nm light irradiation in the solid state at room temperature. The red color disappeared either by melting or dissolving into solvents. The initiation of coloration is most likely based on a photochemical intramolecular hydrogen abstraction by the formyl oxygen from the methyl group on C-3. It also exhibited coloration in 2-methyltetrahydrofuran matrix at low temperature.