Hydrazinium compounds

During the decomposition of precursors as mentioned above, additional reactions may occur. With hydrazinium compounds reduction may well take place [40] ... 

The large diversity available for zirconium compounds becomes evident when hydrazinium compounds are included, examples being (N2H5)2ZrF6 [64], N2H6ZrF6... 

During the thermal decomposition of hydrazinium compounds reduction frequently occurs at the metal center. Although at higher temperatures NH3 decomposes forming H2 and N2, even at quite moderate temperatures an interesting... 

Tertiary amines are aminated to give unstable hydrazinium compounds, for example (54), is suggested by the formation of hydrazine (55) via a Sommelet-Hauser rearrangement on reaction of (51) with iV,jV-dimethylallyl amine (Scheme 11) <91S327>. 

Fig. 5-52. Separation of two different -substituted hydrazinium compounds. — Separator column IonPac NS1 (10 pm) eluent (A) 0.002 mol/L HC1 / acetonitrile (98 2 v/v), (B) 0.002 mol/L HC1 / acetonitrile (93 7 v/v) flow rate 1 mL/min detection suppressed conductivity compounds (A) [C9H19N2]+BF4, (B)...

Hydrazinium compounds such as hydrazinium perchlorate act as acids in this medium. Apart from the N2Hs+-ion the existence of N2He has been shown in compounds like hydrazinium difluoride N2H6F2 . 

Figure 6.54 Separation of two different W,A/ -substituted hydrazinium compounds. Separator column lonPac NS1,10 pm eluent (a) 2 mmol/L HCI/MeCN (98 2 v/v) and...

In addition to the anions listed under HPIC anionic sur ctants, metal-cyanide complexes, aromatic carboxylic acids In addition to the cations listed under HPIC aliphatic and aromatic amines, quaternary ammonium compounds, cationic sur ctants, sulfonium compounds, phosphonium compounds, hydrazinium compounds... 

The asymmetric dimethylhydrazine (ADMH) has been used in the chemistry of macromolecular compounds mostly as polymer modifier [18]. The peculiarities of the reactivity of the tertiary nitrogen atom in ADMH result in the formation of hydrazinium compounds. Only at steric hindrance by quaterniza-tion, the nitrogen atom of the amine group can become reactive. 

The most adequately characterized hydrazinium complexes consisting of coordinated metal ions are (N2H5)2M(S04)2 (M = Mg, Mn, Fe, Co, Ni, Cu, Zn, Cd, and the halides) [31]. In addition, single crystals have been analyzed of Co and Ni double sulfates synthesized under hydrothermal conditions using metal sulfates, hydrazine hydrate, and HF [32]. Table 1.8 lists various hydrazinium compounds along with their crystal data and N—N bond distances. 

Hydrazinium salts, N2H5 X, are acids in anhydrous hydrazine, metallic hydrazides, N2H, are bases. Neutralization in this solvent system involves the hydrazinium and hydrazide ions and is the reverse of equation 7. Metal hydrazides, formally analogous to the metal amides, are prepared from anhydrous hydrazine and the metals as well as from metal amides, alkyls, or hydrides. (The term hydrazide is also used for organic compounds where the carboxyUc acid OH is substituted with a N2H2.) Sodium hydrazide [13598-47-5] is made from sodium or, more safely, from sodium amide (14) ... 

Hydrazine as Nucleophile. Reaction of hydrazine and carbon dioxide or carbon disulfide gives, respectively, hydrazinecarboxyhc acid [471-31-8], NH2NHCOOH, and hydrazinecarbodithioic acid [471-32-9], NH2NHCSSH, in the form of the hydrazinium salts. These compounds are useful starting materials for further synthesis. For example, if carbon disulfide reacts with hydrazine in basic medium with an alkyl haUde, an alkyl dithiocarbazate ester is obtained in a one-step reaction ... 

Discussion. This gravimetric determination depends upon the separation and weighing as elementary selenium or tellurium (or as tellurium dioxide). Alkali selenites and selenious acid are reduced in hydrochloric acid solution with sulphur dioxide, hydroxylammonium chloride, hydrazinium sulphate or hydrazine hydrate. Alkali selenates and selenic acid are not reduced by sulphur dioxide alone, but are readily reduced by a saturated solution of sulphur dioxide in concentrated hydrochloric acid. In working with selenium it must be remembered that appreciable amounts of the element may be lost on warming strong hydrochloric acid solutions of its compounds if dilute acid solutions (concentration <6M) are heated at temperatures below 100 °C the loss is negligible. 

Hydrazinium chlorite [66326-45-2] h2nn+h3cio2- Levi, G. R., Gazz. Chim. Ital. [2], 1923, 53, 105-108 It is spontaneously flammable when dry. See other chlorite salts, redox compounds C1H5N204... 

A yellowish precipitate was obtained from the chloride and hydrazinium chlorides when basified with sodium acetate. It had N—Hg bonds and was perhaps CIHgNHNHHgCl. It exploded on heating or shock. A similar compound resulted from the bromides. 

See Other HIGH-NITROGEN COMPOUNDS, HYDRAZINIUM SALTS, NON-METAL AZIDES... 

Hydrazinium hydrogen selenate, 4558 Hydrazinium nitrate, 4549 Hydrazinium nitrite, 4548 Hydrazinium perchlorate, 4011 Hydrazinium salts, 4546 See PROPELLANTS, REDOX COMPOUNDS... 

The above book [1] deals, in 26 chapters in 5 sections, with theoretical and practical aspects of the use and safe handling of powerful oxidants and their complementary reactive fuels. Materials include nitrogen pentaoxide, perfluoroam-monium ion and salts, nitronium tetrafluoroborate, hydrazinium mono- and diperchlorates, nitronium perchlorate, tricyanomethyl compounds, difluoramine and its alkyl derivatives, oxygen difluoride, chlorine trifluoride, dinitrogen tetraoxide, bromine trifluoride nitrogen fluorides, and liquid ozone-fluorine system. 

Military propellants are based on relatively powerful oxidisers and fuels of high calorihc value in order to develop an improved thrust or impulse. Thus the most commonly-used oxidisers are potassium perchlorate, ammonium perchlorate or more esoteric compounds such as hydrazinium nitroformate. Metallic fuels include aluminium, magnesium and beryllium, while binders are mainly hydrocarbons such as polybutadiene, polyisobutylene, polyurethane or poly(vinyl chloride) (PVC) as presented in Table 3.2. 

Several methods were described for the selective de-S-acetylation of 0-acetyl protected 1-thioglycoses. Sodium methoxide in methanol at low temperature (below -20 °C) was known to afford mainly the de-S-acetylated compound [16] or exclusively this compound when the reaction was quenched at low temperature by adding H-l- resin [17]. Demercuration of tetra-O-acetyl-l-phenylmercury(II)-thio- -D-glucopyranose (12) (Scheme 4) obtained by treatment of (8e) with phenylmercury(II)acetate afforded a convenient synthesis of tetra-0-acetyl-l-thio-/3-D-glucose (8a) [18]. This sequence applied to the a-anomer (10a) (Scheme 3) led to the expected de-S-acetylated compound (10b) [19]. Chemoselective deprotection of thioacetate at the anomeric position of peracetylated 1-thioglycoses was also achieved in good yield by action of cysteamine in acetonitrile or hydrazinium acetate in DMF [20,11]. 

Hydrazotc acid, HN,. ply.. = 4.72, and most of its covalent compounds (including its heavy metal salts) are explosive. It is formed (1) in 90% yield by reaction of sodium amide with nitrous oxide, (2) by reaction of hydraztntum ion with nitrous acid, (3) by oxidation of hydrazimum salts, (4) by reactio n of hydt azinium hydrate with nitrogen trichloride tin benzene solution). Hvdrazoic acid forms metal azides with the corresponding hydroxides and carbonates. It reacts with HC1 to give ammonium chlonde and nitrogen, with H2SO4 to form hydrazinium acid solfate, with benzene to form aniline, and it enters into a number of oxidation-reduction reactions. 

OXOSALTS OF NITROGENOUS BASES HYDRAZINIUM SALTS HYDROXYLAMINIUM SALTS A-HALOGEN COMPOUNDS... 

AZIDOCARBONYL COMPOUNDS HYDRAZINIUM AZIDES METAL AZIDES NON-METAL AZIDES ORGANIC AZIDES... 

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