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[Vadim]

Привет! Помогите, пожалуйста, с абстрактом :

Chem.Abstr. 1969 , vol. 70, # 77876t

Заранее премного благодарен!

[Arkadii_Tarasevych]

Похоже на то, что Вы ищите?

Synthesis and conversions of carboxylic acids of the 1,2,4-triazole series

By Bagal, L. I.; Pevzner, M. S.; Lopyrev, V. A. Edited by Hillers, S

From Khim. Geterotsikl. Soedin., Sb. 1: Azotsoderzhashchie Geterotsikly (1967), 180-3. Language: Russian, Database: CAPLUS

A no. of reactions of 3-diazo-1,2,4-triazole-5-carboxylic acid (I) were studied. I is prepd. from 3-amino-1,2,4-triazole-5-carboxylic acid (II). Thus, I (freshly prepd. from 17 g. II) was added portionwise to a soln. of 12 g. NaH2PO2 and 20 ml. concd. HCl in 80 ml. H2O at <15°, and the mixt. kept 2 hrs. and worked up to yield 8 g. 1,2,4-triazole-3-carboxylic acid, m. 136-7°, also prepd. by alk. oxidn. of 3-methyl-1,2,4-triazole with KMnO4; Me ester m. 184° (decompn.); hydrazide m. 277-8°. Freshly prepd. I from 9.8 g. II was added at 15° to a soln. of 20 g. NaNO3 and 20 g. Cu(NO3)2.-2H2O in 60 ml. H2O, and the mixt. kept 3 hrs. at 35-40° and worked up to give 4.1 g. 3-nitro-1,2,4-triazole-5-carboxylic acid (III), m. 100-2° (dihydrate). III heated 10 min. at 110-20° gave 3-nitro-1,2,4-triazole, m. 210°. III Me ester m. 134° (decompn.); III hydrazide m. 177-9° (decompn.). Reaction of I with concd. aq. HCl 4 hrs. at 40° and work up gave a mixt. of 3-chloro-1,2,4-triazole-5-carboxylic acid (IV) and 3-chloro-1,2,4-triazole (V). On melting this mixt. decarboxylated to give V, m. 167°, the same mixt. was also prepd. by reaction of III with PO-Cl3-PCl3. IV was sepd. from the mixt. via the K-salt. It could not be further purified. Me ester of IV m. 121°.

[Vadim]

Да, это именно то, что мне нужно. Спасибо большое!!!