40925-73-3Relevant articles and documents
QUESTION OF THE MECHANISM OF THE FORMATION OF 5-HYDRAZINO-TETRAZOLE FROM 5-DIAZOMETHYLAZOTETRAZOLE IN ACIDIC MEDIA
Mayants, A. G.,Tishchenko, L. M.,Vladimirov, V. N.,Shlyapochnikov, V. A.
, p. 1149 - 1151 (1992)
The heating of the hydrate of 5-diazomethylazotetrazole in an aqueous medium led to the isolation, for the first time, of 5-hydroxymethylazotetrazole - the proposed intermediate product in the isolation of 5-hydrazinotetrazole from 5-diazomethylazotetrazole in acidic media.It was established that 5-hydrazinotetrazole is not formed when 5-hydroxymethylazotetrazole is treated with hydrochloric acid under different conditions.In this connection, an improved reaction mechanism, not including 5-hydroxymethylazotetrazole as an intermediate compound, was proposed.It was shown that not all of the 5-diazomethylazotetrazole enters into the reaction with water.The proposition was expressed that the product which did not enter into the reaction is the Z-isomer.
Synthesis of nitrogenated lignin-derived compounds and reactivity with laccases. Study of their application in mild chemoenzymatic oxidative processes
Albarrán-Velo, Jesús,López-Iglesias, María,Gotor, Vicente,Gotor-Fernández, Vicente,Lavandera, Iván
, p. 50459 - 50471 (2017/11/10)
The chemical synthesis of a series of lignin-derived nitrogenated compounds was performed in high yields (73-99%) through simple conventional chemical transformations starting from natural monomers such as vanillin, syringaldehyde or 3,4-dihydroxybenzaldehyde. The study of the vanillin-derived compounds as substrates for commercially available laccases from Trametes versicolor and Myceliophthora thermophila in oxidative transformations, generally led to the isolation of several dimeric species in high to excellent conversions (>70%), while for hydrazone derivatives a more rapidly oxidative coupling was evidenced by the formation of oligomers and/or polymers. Remarkably, vanillin was obtained due to the hydrolysis of some of the nitrogenated functional groups, such as the hydrazone or the hydrazono tetrazole. The three families of lignin-derived compounds can provide a great source of new laccase-mediator systems (LMS), the possibility of employing them for lignin modification being particularly attractive. Preliminary experiments showed promising levels of activity towards the oxidation of a monomer (veratryl alcohol, up to 70% conversion) and a dimer (adlerol, up to 22% conversion) lignin models, higher than those achieved with the natural vanillin and syringaldehyde (up to 7% conversion with veratryl alcohol and almost negligible conversion with adlerol), these processes being also highly influenced by the pH of the reaction medium.
Nitrogen-rich polymers based on 5-bromo-1-vinyl-1H-tetrazole
Klapoetke, Thomas M.,Sproll, Stefan M.
scheme or table, p. 1169 - 1175 (2010/05/03)
Nitrogen-rich, polymers with contents of nitrogen between 50 and 60 % were synthesized by radical polymerization using 1 - ( 1 -vinyl-1H-tetrazol-5-yl) hydrazine and 1-methyl-1-( 1 -vinyl-lH-tetrazol-5-yl)hydrazine. The monomers were ob-tained by substitu
