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S-alkylthiosemicarbazonium salts in the synthesis of 1,2,4-triazolines. Molecular structure of 1,4-diacetyl-3-(5-nitrofurfurylthio)-5-(2-furyl)-δ2-1,2,4-triazoline

✍ Scribed by E. B. Usova; G. D. Krapivin; V. E. Zavodnik; V. G. Kul'nevich


Publisher
Springer US
Year
1990
Tongue
English
Weight
459 KB
Volume
26
Category
Article
ISSN
0009-3122

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[4+2] Cycloaddition of 2(1H)-pyrazinones
✍ Takehiko Nishio 📂 Article 📅 1998 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 273 KB

## Abstract The reaction of 2(1__H__)‐pyrazinones 1 and 1,2,4‐triazoline‐3,5‐diones 3 was investigated by comparing that of 1 with singlet oxygen. 2(1__H__)‐Pyrazinones 1 reacted in Diels‐Alder fashion with 1,2,4‐triazoline‐3,5‐diones 3 to afford [4+2]‐adducts 4–17 in high yields.