Hydrazine, -, monohydrochloride

Hydrazine monohydrochloride [2644-70-4] M 68.5, m 89°. Prepared by dropwise addition of cold cone HCl to cold liquid hydrazine in equimolar amounts. The crystals were harvested from water and were twice recrystd from absolute MeOH and dried under vacuum. [Kovack et al. J Am Chem Soc 107 7360 1985.]... 

Triazole has been prepared by the oxidation of substituted 1,2,4-triazoles, by the treatment of urazole with phosphorus pentasulfide, by heating equimolar quantities of formyl-hydrazine and formamide, by removal of the amino function of 4-amino-l,2,4-triazole, by oxidation of l,2,4-triazole-3(5)-thiol with hydrogen peroxide, by decarboxylation of 1,2,4-triazole-3(5)-carboxylic acid, by heating hydrazine salts with form-amide,by rapidly distilling hydrazine hydrate mixed with two molar equivalents of formamide, i by heating N,N -diformyl-hydrazine with excess ammonia in an autoclave at 200° for 24 hours, and by the reaction of 1,3,5-triazine and hydrazine monohydrochloride. ... 

C 7H jBrN3 65676-22-4) see Brompheniramine bromo(2-phenylethyl)magnesium (CjH BrMg 32 77-S9-2) see Enalapril (4-bromophenyl)hydrazine monohydrochloride (C4HgBrClN2 622-88-8) see Bromazepam... 

Solutions of pentaammine(nitrogen)ruthenium(II) have been prepared from ruthenium (III) chloride and hydrazine hydrate.1,2 These solutions have been used to prepare pentaammine-haloruthenium(III) salts [Ru(NH3)6X]X2 (X = Cl, Br, I). [Ru(NH3)5C1]C12 has been converted to pure pentaammine-(nitrogen)ruthenium(II) salts—[Ru(NH3)5N2]X2 (X- = Cl-, Br-, I-, BF4-, PFg-)—via the reaction between azide ion and aquopentaammineruthenium(III).2 Hexaammineruthe-nium(III) salts—rRu(NH8)6]X3 (X = I-, BF4-)—have been prepared by the reaction between pentaamminechlororuthenium-(III) chloride and hydrazine monohydrochloride. 

Hydrazine monohydrochloride may be purchased commercially. Alternatively, it may be prepared by adding concentrated hydrochloric add dropwise, with stirring, into a well-cooled hydrazine hydrate solution until the pH is about 7 (Alkacid paper). The solution is evaporated to the point of crystallization and cooled. The product which separates is collected by filtration. The resulting solid has a high water of crystallization but is perfectly suitable for the preparation of heraammineruthenium (III) salts. 

IV-Alkyl-substituted phthalimides 9 were easily transformed into mono-, di- or trisubslituted pyrazoles 10 via a one-pot addition/decyclization/cyclocondensation sequence <02JCS(P1)207>. 5-Silylpyrazoles can be prepared from condensation of silylalkynones with hydrazines <02T4975>. Reactions of acylated diethyl malonates with hydrazine monohydrochloride in ethanol afforded 3,4-disubstituted pyrazolin-5-ones <02T3639>. 

Solid-phase synthesis of substituted pyrazolones 550 from polymer-bound /3-keto esters 549 has been described (Scheme 68) <2001EJ01631>. Trisubstituted pyrazole carboxylic acids were prepared by reaction of polymer-bound arylidene- or alkylidene-/3-oxo esters with phenylhydrazines <1999S1961>. 2-(Pyrazol-l-yl)pyrimi-dine derivatives were prepared by cyclocondensation of ethyl acetoacetate and (6-methyl-4-oxo-3,4-dihydropyrimi-din-2-yl)hydrazine with aromatic aldehydes <2004RJC423>. Reactions of acylated diethyl malonates with hydrazine monohydrochloride in ethanol afforded 3,4-disubstituted-pyrazolin-5-ones <2002T3639>. Reactions of hydrazines with A -acetoacetyl derivatives of (45 )-4-benzyloxazolidin-2-one (Evans oxazolidinone) and (2R)-bornane-10,2-sultam (Oppolzer sultam) in very acidic media gave pyrazoles retaining the 3(5)-chiral moiety <1999S157>. 

Hydrazine monohydrochloride reacting with 1,3,5-triazine in refluxing ethanol yields 1,2,4-triazole in near-quantitative yield . The H2SO4 produced in reaction 38 degrades the product 94 during the prolonged reaction time required. The location of in the 1 and 2 positions of 94 has been assigned by the N-NMR spectra. 

When hydrazine monohydrochloridc (7, R = H) is treated with 1,3,5-lriazinc (1) in refluxing ethanol l//-l,2,4-triazole (8, R = H) is obtained in 95% yield.20 Use of monosubstituted hydrazine monohydrochloride gives 1-substituted 1//-1,2,4-triazoles 8 in good yields.18,20... 

Hydrazine, 1,2-diphenyl-. See Hydrazobenzene Hydrazine HCI. See Hydrazine monohydrochloride... 

Hexamethylcyclotrisilazane Hexylsilane Hydrazine Hydrazine carbonate Hydrazine monohydrate Hydrazine monohydrochloride Hydrazine sulfate Hydriodic acid Hydroxylamine hydrochloride Hydroxylamine sulfate Hypophosphorous acid Isocyanatopropyltriethoxysilane Lithium Magnesium 2-Mercaptoethanol 3-Mercaptopropylmethyldimethoxysilane 3-Methacryloxypropyltris (trimethylsiloxy) silane N-Methylaminopropyltrimethoxysilane Methylcyclohexyldichlorosilane Methylcyclohexyldimethoxysilane Methyidichlorosilane Methyidiethoxysilane N-Methyl-N-trimethylsilyltrifluoroacetamide Octadecyidimethylsilane Octadecyidimethyl [3-(trimethoxysilyl) propyl] ammonium chloride Octadecylsilane Octylsilane Octyltrichlorosilane 1,1,1,3,3-Pentamethyl-3-acetoxydisiloxane 2-... 

Ammonium silicofluoride Boron trichloride Boron trifluoride Butyl acid phosphate Dioctyl sodium sulfosuccinate Hydrazine monohydrochloride... 

Hydrazine monohydrochloride 2646-17-5 Solvent orange 2 2650-18-2 D C Blue No. 4 2666-17-3 Acid blue 41 2673-22-5 Calgene DTSS-70 DeWET SDTD-70 Ditridecyl sodium sulfosuccinate Emcol 4600 Geropon BIS/SODICO-2 Monawet MT-70E Polirol TR/LNA Sabomin TRS 2675-77-6... 

Shimizu, W Sato, T., Matsumoto, T., and Murakami, Y. (2012) Rapid synthesis of low-fractal dimension titaniiun oxide polymers by a sol-gel technique using hydrazine monohydrochloride. /... 

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