Hydrogenations hydrazines

Benzyl carbamates of pyrrole-type nitrogens can be cleaVfed with nucleophilic reagents such as hydrazine hydrogenation and HF treatment are also effective. ... 

Hexone (methyl isobutyl ketone) sec-Hexyl acetate Hydrazine Hydrogen chloride... 

Hydrazine Hydrogen peroxide, nitric acid, or any other oxidant... 

Recent studies have been directed towards the synthesis of heterocyclic hydrazones which have lower toxicities than thiosemicarbazones [44], It has been proposed that the hydrazinic N-H group is essential for activity since it might be involved in a crucial radical formation step important in the mechanism of RDR. This is supported by the loss of antileprotic activity for this series of compounds when the hydrazinic hydrogen is replaced by a methyl group [44]. The heterocyclic hydrazones, like thiosemicarbazones, behave as tridentate ligands. 

Used in agriculture as a fertilizer and defoliant in the manufacture of nitric acid, hydrazine, hydrogen cyanide, urethanes, acrylonitrile, nitrocellulose, nitroparaffins, melamine, ethylene diamine, and sodium carbonate as an intermediate in producing explosives, synthetic fibers and dyes and used industrially as a refrigerant gas, neutralizing agent in the petroleum industry, latex preservative, and the production of fuel cells. 

The reagent can be prepared in situ, by the copper-catalyzed oxidation of hydrazine. Hydrogen peroxide or oxygen are often the oxidants. The acid-catalyzed decomposition of potassium azodicarboylate provides a useful source of diimide ... 

By the action of hydrazine hydrate on a dilute solution of selenic acid, hydrazine hydrogen selenate may be obtained as a colourless compound which is not decomposed by boiling water, but which, when dry, explodes with great readiness when subjected to heat, to shock, or to fumes of hydrogen chloride. For this reason, before hydrazine hydrate is used in the analysis of selenium compounds (see p. 307), it is essential that selenic acid and selenates should be reduced to selenites by means of hydrochloric acid.3... 

Single compounds which decompose exothermically such as hydrazine, -hydrogen peroxide, ethylene oxide, acetylene, etc. 

Ruhlmann prepared 2,5-dialkyl-l,3,4-thiadiazoles (6) in high yields via 1,3,4-thiadiazolidines (8). These were obtained from hydrazine, hydrogen sulfide, and aliphatic aldehydes, and they were oxidized to 6 by sulfur in boiling piperidine. 

In liquid hydrazine, hydrogen bonding occurs between the hydrazine molecules similar to the hydrogen bonding in liquid water. In solid hydrazine, the hydrogen bonds have NH-N distances between 319 and 367 pm. In hydrazine hydrate, each hydrazine molecule is linked via six hydrogen bonds to surrounding water molecules so that the hydrazine molecules are separated from each other by water molecules. Some physical properties of hydrazine and hydrazine hydrate are shown in Table 16. 

SYNS HS HYDRAZINE HYDROGEN SULFATE HYDRAZINE MONOSULFATE HYT3RAZINE SULPHATE H DRAZINIUM SULFATE HYDR. tZONIUM SULFATE IDRAZINA SOLFATO (ITALIAN) NSC-150014 SIRAN HYDRAZINU (CZECH)... 

PHENETHYLHYDRAZINE SULFATE (1 1) PHENUNE PHENODYNE PHENYLAETHYL-HYDRAZIN P-PHENYLETHYLHYDRAZINE DIHYDROGEN SULFATE 2-PHENYLETHYLHYDRA-ZINE DIHYDROGEN SULPHATE P-PHENYLETHYL-HYDRAZINE HYDROGEN SULPHATE O PHENYL-ETHYLHYDRAZINE SULPHATE S 1544 STINERVAL... 

HYDRAZINE HYDROGEN SULFATE see HGW500 (T-4)-(HYDR. ZINE-KAPPAN)TRIHYDROBORON see HGU025... 

Upon reaction with hydrazine, hydrogen, or CH3O, the Pd—C bond is reductively cleaved ... 

Micellization has been studied in a large number of nonaqueous polar solvents, such as different alcohols, formamide, fused salts [19-26], hydrazine, hydrogen fluoride [27], and IV-methylsydnone [28,29], However, most of the early investigations used indirect methods such as surface tension measurements or conductimetry for the detection of surfactant aggregation. More recently, direct methods have been used to prove the existence of aggregates in the solution phase of polar solvent other than water. For example, PGSE-NMR [17], fluorescence spectroscopy [30], and SANS [31] have proven to be powerful methods for probing micelle formation in aqueous and nonaqueous systems. 

By analogy with Grignard reagents, other nucleophiles can be introduced into 1,2,4-triazines in an addition/oxidation sequence giving a formal substitution of hydrogen. This holds particularly for ammonia, hydrazine, hydrogen cyanide, and sulfur dioxide. Also examples involving preactivation of the triazine system by protonation or alkylation are discussed in Section 2.2.1.5.5. 

FERRIC OXIDE (1309-37-1) FcjO, Violent reactions with powdered aluminum (thermite reaction), hydrogen peroxide, calcium disilicide (thermite reaction), ethylene oxide (may cause explosive polymerization), calcium hypochlorite, hydrazine, hydrogen trisulfide, powdered magnesium. Contact with carbon monoxide may cause fire or explosion. Incompatible with calcium carbide (powdered), chlorides, guanidinium perchlorate, metal acetylides. Contact with the explosive hydrazinium diperchlorate or ammonium perchlorate can increase heat-, mechanical shock-, or friction sensitivity. Incompatible with aluminum-magnesium-zinc alloys. Spent material... 

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