Hydrazine nitrite

Ammonia, hydrazine, nitrites, and azides ate oxidized by bromine. Nitrogen is often a product of such reactions. 

Cobalt( l)hydrazine Nitrite, 2Co(NOz)2.3N2 H4 dull red pdr, explodes on heating or on contact with coned sulfuric acid. Was obtained by interaction of ice-cooled solns of Co acetate with Na nitrite Refs l)P.Ray B.K.Goswami, ZAnorg-Chem 168, 331 337 (1927) 2)Gmelin, syst Nr 58, Teil B (1930), 10... 

To show that the source of the amino acids in our experiments was not the result of the reaction of the various nitrogen species produced in the reaction with ascorbic acid, we reacted ascorbate individually and in combination with ammonia, hydrazine, nitrite, and nitrate. Very low traces of amino acids were produced in these reactions, indicating that the amino acids detected are in fact produced from the electric discharge reaction. While ascorbic acid is not likely to have been an abundant prebiotic species, oxidation could have been inhibited by other available chemical species such as sulfides and reduced metal ions. 

Metal hydroxide + hydrazine + nitrite (Thiele process) X X X ... 

As usual there have been a number of papers on the hydrolysis of polyphosphates. Complexes of [VO] + or [VO] + with polyphosphates give species in which phosphate hydrolysis is much more rapid than for the uncomplexed species. We may also note the appearance of further evidence that the oxidation reactions of peroxodiphosphate involve hydrolysis in the rate-determining stage. Studies on the oxidation of antimony(iii), hydrazine, nitrite, and hypophosphite have appeared. ... 

H—N—N=N. It is prepared by the oxidation of hydrazine in strongly acid solution the oxidising agent used is usually nitrous acid (i.e. sodium nitrite is added to the acid solution of hydrazine) ... 

Automobile safety air bags use sodium azide [26628-22-8] NaN, for gas generation. It can be made from hydrazine by refluxing ethyl or Abutyl nitrite with hydrazine hydrate and sodium hydroxide in alcohol (209,210) ... 

During electrolytic reduction of to and the subsequent reduction of Pu to inextractable Pu hydrazine is added as a holding agent to destroy excess nitrite ions and prevent reoxidation of and Pu to their higher valence states. 

Nitrite can be deterrnined by reaction with sulfanilamide to form the diazo compound, which couples with /V-(1-naphthyl)ethylenediamine dihydrochloride to form an intensely colored red azo dye. Nitrate can be deterrnined in a similar manner after reduction to nitrite. Suitable reducing agents are cadmium filings or hydrazine. This method is useful at a nitrogen concentration of 10 -lO " M. 

Preparation of 4-Benzy/oxypheny/hydrazine 200 grams 4-benzyloxyaniline hydrochloride was suspended in a mixture of 264 ml concentrated hydrochloric acid, 528 ml water and 732 grams crushed ice. A solution of 62.4 grams sodium nitrite in 136 ml water was added below the surface of the stirred suspension at -10 2°C during 10 minutes. After stirring for 1 hour at 0°C, the suspension was treated with acid-washed charcoal and filtered. 

No satisfactory direct gravimetric procedure is available but nitrite can be oxidised to nitrate by permanganate or cerium(IV) and then determined in that form. The determination of total nitrate + nitrite is an important analysis, e.g. for soil samples. Nitrite may be destroyed using urea, sulphamic acid or hydrazine sulphate the reaction with the former is ... 

Naphtho analogues, naphtho[2,l-e]tetrazolo[l,5-6][l,2,4]triazine, naph-tho[l,2-e]tetrazolo[l,5-b][l,2,4]triazine, and naphtho[2,3-e]tetrazolo[l,5-Zj][1, 2,4]triazine, were prepared (82JOC3168 84JOC3199) by cyclization of the respective hydrazine with sodium nitrite in acetic acid or by azide displacement of a leaving group. Elucidation of the site of annulation of the tetrazole ring was accomplished by X-ray analysis and l3C-NMR spectroscopy (Scheme 189). 

The hydrazine 70 reacts with triethyl orthoformate, sodium nitrite in acetic acid, or pyruvic acid, to yield l,2,4-triazolo[4,3-c]-, tetrazolo[l,5-c]- and l,2,4-triazino[5,6-c]pyrano [4 ,3 4,5]pyrrolo[3,2-e]pyrimidine derivatives 71(X= CH), 71(X= N) and 72 respectively <95KGS700 96CA(124)176023>. 

Whether nitrogen is in the reduced form (ammonia, ammonium salts, hydrazine) or the oxidised form (nitrites, nitrates), sodium gives rise to dangerous interactions. With the first set of compounds metalation occurs with formation of unstable or highly reducing compounds, whilst, with the second, redox reactions occur. 

Ethyl formate34,52 or orthoformate5 3,54 reacts with two equivalents of phenylhydrazine to yield 1,5-diphenylformazan (11) the reaction takes place under acidic conditions and involves an oxidation. Under basic conditions, ethyl nitrate reacts at the methylene position to yield 3-methyl-1,5-diphenylformazan (37) which can also be obtained from the reaction of phenyl-azoethane (38) with isoamyl nitrite (Scheme 4).8,68 Aryl hydrazines react with a variety of s-triazines (39) to yield 1,5-diaryl formazans with hydrogen, methyl, or phenyl groups in the 3-position as in 40 (Eq. 6).56 Hydrazines have also been reported to react with benzotrichloride55,658 and sym-diamino tetrazine659 to yield formazans. 

AP108) from the reaction of hydrazine with sodium nitrite in acetic acid. Treatment of 625 (R = Et) with sodium nitrite in acetic acid gave 656 (R = Et) through the 3-azido valence tautomer 654 (R = Et) (87API 191). 

Thiation of [l,2,4]triazino[3,2-h]quinazoline-3,10-dione 782 with phosphorus pentasulfide in pyridine proceeded selectively to give the 3-thioxo analogue 783. The latter was converted to the corresponding 3-methylthio derivative 784 by reaction with methyl iodide. Treatment of 784 with hydrazine gave 785, which was converted to 786 and 787 by cyclization with formic acid or carbon disulfide (90JHC591). Cyclization of 785 with sodium nitrite in hydrochloric acid gave 788 (90JHC591). 

Electrophilic substitution of the ring hydrogen atom in 1,3,4-oxadiazoles is uncommon. In contrast, several reactions of electrophiles with C-linked substituents of 1,3,4-oxadiazole have been reported. 2,5-Diaryl-l,3,4-oxadiazoles are bromi-nated and nitrated on aryl substituents. Oxidation of 2,5-ditolyl-l,3,4-oxadiazole afforded the corresponding dialdehydes or dicarboxylic acids. 2-Methyl-5-phenyl-l,3,4-oxadiazole treated with butyllithium and then with isoamyl nitrite yielded the oxime of 5-phenyl-l,3,4-oxadiazol-2-carbaldehyde. 2-Chloromethyl-5-phenyl-l,3,4-oxadiazole under the action of sulfur and methyl iodide followed by amines affords the respective thioamides. 2-Chloromethyl-5-methyl-l,3,4-oxadia-zole and triethyl phosphite gave a product, which underwent a Wittig reation with aromatic aldehydes to form alkenes. Alkyl l,3,4-oxadiazole-2-carboxylates undergo typical reactions with ammonia, amines, and hydrazines to afford amides or hydrazides. It has been shown that 5-amino-l,3,4-oxadiazole-2-carboxylic acids and their esters decarboxylate. 

Phthalic acid Piperazine Platinum Nitric acid, sodium nitrite Oxidizers Acetone, arsenic, hydrazine, lithium, proxosulfuric acid, phosphorus, selenium, tellurium... 

The elegant synthesis of sodium azide from hydrazine and alkyl nitrite is carried out in the same way (Stolle) ... 

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