Hydrazine Hydrate Solution Research Articles

Reaction of esters of 2-substituted 5-pyrimidinecarboxylic acids with hydrazine hydrate

The reaction of methyl esters of 2-substituted 5-pyrimidinecarboxylic acids with hydrazine hydrate at 0–5°C results in the nucleophilic substitution of readily eliminating groups (Cl, CH3O, CH3S) at the position 2 of the pyrimidine ring, and, on the boiling with the 80% aqueous solution of hydrazine hydrate, the reaction is accompanied by the formation of hydrazides. The dimethylamino group at thepposition 2 of the pyrimidine ring is not substituted by hydrazine.

Synthesis, Characterization and Thermal Analysis of Metal Hydrazinesulfinates

Abstract Metal hydrazinesulfinates of the formula M(N2H3SOO)2, where M is Mn, Fe, Co, Ni, Zn and Mg have been prepared by passing sulfur dioxide gas through an aqueous solution of metal salt and hydrazine hydrate. Four coordination of the metal ions are proposed on the basis of magnetic, visible and infrared spectral data. The thermal analyses of these compounds show an exothermic decomposition to give metal sulfites in the cases of the Fe, Co, Zn and Mg compounds, whereas the Mn and Ni compounds give metal sulfates. The X-ray powder diffraction patterns indicate that the compounds are isomorphous.

Application of electroless procedures to the preparation of palladium catalysts

The influence of various (laser, UV lamp and thermal) activation treatments on the diffuse reflectance and ESR spectra of CeO2 are examined. Ceria-supported palladium catalysts are prepared by electroless deposition of the metal from palladium chloride and hydrazine hydrate solutions. The atomic defects induced in ceria by the activation procedures appear to initiate the palladium deposition.

A New Chemical Method of Preparing Semiconducting MoX2 (X=S, Se) Thin Films

We report a new chemical method for preparing semiconducting MoX2 (X=S, Se) thin films on glass substrates. For MoS2 deposition, an ammine complex of Mo (VI) ions, thioacetamide and hydrazine hydrate solutions was used, while for MoSe2 films, sodium selenosulphate solution replaced thioacetamide, and other reagents remained unchanged. Structural, optical and electrical properties of the as-deposited and annealed films have been studied.

Microdetermination of organic halogens by argentometric titration using Gran's plot.

Halogens in microamounts of organic compounds were determined using the flask combusion method and the potentiometric titration with a silver nitrate standard solution. A silver wire electrode treated in a saturated silver halide solution for more than 24 h was employed for measuring the electrode potential in a sample solution containing the same halide ion. An aliquot of 0.005 M halide solution was accurately pipetted into a 50 ml beaker and made up to the mark with water. The silver electrode and a double junction reference electrode were inserted into the solution, which was titrated with a 0.005 M AgNO3 standard solution. The electrode potential was measured at 2 min after each addition of the titrant. The end point of the titration was determined by using Gran's plot for two data points on a personal computer. When the titration fraction was taken at two data points of 40% and 60%, the relative standard deviations of the volume of end points were 0.49% for Cl-, 0.44% for Br-, and 0.71% for I-. This method was applied to microdetermination of organic halogens after flask combusion as follows: A sample weighing about a few mg on a piece of filter paper was ignited in an oxygen flask containing 5 ml of water and 5 drops of 5% hydrazine hydrate solution as an absorption liquid. After standing for 30 min, the solution was transferred to a 50 ml beaker. After the addition of 4 ml of 0.1 M HNO3 solution to adjust pH around 5, the solution was finally made up to 50 ml with water. The solution was then titrated with 0.005 M AgNO3 standard solution. The end point was determined using the Gran's plot method as described above. Micro determination was carried out for several organic halogen compounds and the relative standard deviation of the determinations was 0.21%.

PREPARATION OF FIBROUS WEAK ACIDIC CATION EXCHANGER

A preparation of fibrous weak acidic exchanger is carried out by chemically modifying acrylic fiber as follows:1) Acrylic fibers, as raw material, are treated with aqueous hydrazine hydrate solution for the crosslinking.2) Then the fibers are treated with aqueous caustic soda solution to introduce carboxyl group on the hydrolysis of residual nitrile groups. The results thus obtained are as follows.a) The fibrous ion exchanger obtained is an amphotenic ion exchanger. However, since much more cation exchange groups than anion exchange groups can be introduced, it can practically be used as a cation exchanger.b) The ion exchange capacity of the fibrous ion exchanger obtained is about 6-9 meq/g and the weaker hydrazine treatment gives the higher ion exchange capacity and water swelling ratio. On the contrary, the mechanical strength of the fibrous ion exchanger goes down.c) After the hydrazine hydrate treatment the color of the fiber becomes light yellow and subsequently changes into orange in the air. Immediately after the caustic soda treatment, the color is light yellow but it changes into light red in the air.

Automatic microanalyzers: IV. Automatic analyzer for rapid microdetermination of chlorine or bromine in organic compounds

An automatic microdetermination of chlorine or bromine in organic compounds is described. The sample is weighed out in an aluminum microbeaker which is dropped into a vertical combustion tube, previously described, the quartz combustion chamber of which is heated up to 1050 °C. A flash combustion in oxygen takes place and the gaseous combustion products are absorbed in a cell with a circulating absorption solution of acetic acid and hydrazine hydrate as a reducing reagent in water. Both halogens give halogenide ions in the absorption solution where they are titrated coulometrically by electrolytic silver ions with an amperometric titration end point. The precision of the results is the same as that obtained with common microanalytical techniques.

Electron-microscopic procedure for acrylic rubber

The electron-microscopic visualization of acrylic rubber dispersed in a heterogeneous structural resin composition consisting of a rubber-modified two-phase plastic comprising essentially a butyl acrylate rubber phase and an acrylonitrile–styrene copolymer phase, respectively, has been accomplished. This procedure consists of the following: The molded resin specimen is treated with hydrazine hydrate solution to produce the acrylic acid hydrazides. Allow the treated specimen to soak in osmium tetroxide solution. The acrylic rubber may be indirectly fixed and stained. Some micrographs of ultrathin sections of two or three resin compositions, cut by an ultramicrotome, are presented.

ChemInform Abstract: SYNTHESIS OF 1,1,1‐TRIS(2‐HYDROXYETHYL)AMINE‐2‐ACYLIMIDE

AbstractDurch Erhitzen eines Gemisches von Fettsäureestern (I), Hydrazinhydrat (II) und Äthylenoxid (III) in einem Lösungsmittel gelangt man in einer Stufe zu den oberflächenaktiven Aminoimiden (IV).

Synthesis of 1,1,1‐Tris(2‐hydroxyethyl)amine‐2‐acylimide

Abstract1,1,1‐Tris(2‐hydroxyethyl)amine‐2‐acylimide (I) was prepared by the reaction of hydrazine hydrate, ethylene oxide, and fatty acid methyl ester. Reaction conditions such as solvent, reaction temperature, and molar ratio of reactants were investigated, and (I) was obtained in 73% yield by heating an isopropanol solution of hydrazine hydrate, methyl palmitate, and ethylene oxide in molar ratio of 1:6:6 at 80 C for 2 hr.

The Hydration and Crystallization of ρ-Alumina and Alumina-gel in Aqueous Solutions of Various Basic Reagents

Abstract Alumina gel, boehmite gel, ρ-alumina, η-alumina, and γ-alumina were treated with aqueous solutions of various inorganic and organic reagents at temperatures below 100°C. Boehmite gel, η-alumina and γ-alumina were found to show no change upon this treatment, while alumina gel and ρ-alumina either remained unchanged or changed into fairly well-crystallized boehmite, boehmite gel, gibbsite, bayerite, or nordstrandite, according to the treating conditions. It has been newly established that water-containing pyridine and aniline, the aqueous solution of hydrazine hydrate, and the aqueous solution of o, m-phenylenediamine are effective in forming fairly well-crystallized boehmite, nordstrandite, and gibbsite respectively.

Studies on polypeptides VI: Synthesis of protected hexa‐ and octa‐peptide hydrazides related to the N‐terminal part of bovine pancreatic ribonuclease a using the solid‐phase method

AbstractMerrifield's solid‐phase method was applied to the synthesis of all‐L‐t‐butoxycarbonylthreonylalanylalanylalanyl‐Nϵ‐benzyloxycarbonyllysylphenylalanine hydrazide and all‐L‐Nα, Nϵ‐di‐t‐butoxycarbonyllysyl‐γ‐t‐butylglutamylthreonylalanylalanylalanyl‐Nϵ‐benzyloxycarbonyllysylphenylalanine hydrazide. Cleavage from the solid support with a solution of hydrazine hydrate in dimethylformamide and additional purification gave homogeneous products in high overall yields. Conventional syntheses of these compounds led to identical products.

Determination of pyrimidine ribonucleosides and nucleotides with the orcinol reaction

Prior hydrazinolysis of pyrimidine nucleosides permitted a positive color reaction with orcinol. After the treatment with 80% hydrazine hydrate solution at 65° for 1.5 hr, cytidine and uridine gave quantitative coloration. Uridine showed a quantitative color yield even after mild hydrazinolysis. Pyrimidine ribonucleotides were similar in behavior to that of the corresponding nucleosides. By the orcinol reaction with and without prior hydrazinolysis, the purine nucleosides, cytidine, and uridine could be determined individually.

Chlorocruoroporphyrin: a Simple Method of Preparation

Munro Fox (1926, Addendum, p. 219) described a method of preparation of chlorocruoroporphyrin from the blood of the marine polychaete worm Spirographis. This was based upon the very troublesome method of Nencki & Zaleski (1900), which is time-consuming and wasteful. Furthermore, Spirographis is not easily obtainable in this country. Lemberg & Parker (1952) started with protoporphyrin, and by careful oxidation with potassium permanganate in acetone obtained a solution which gaVe mixed crystals of chlorocruoroporphyrin and diformyldeuteroporphyrin esters. Purification was by fractional chromatography. The procedure to be described here is simple and rapid, and could easily be carried out in one day by a biologist requiring a small sample of the porphyrin. The two methods mentioned above would not come into this category.This work was done at the Plymouth Laboratory, and I am very grateful to Mr T. R. Tozer of that laboratory for so kindly obtaining the animals for me and extracting the blood.The polychaete worms Myxicola infundibulum, Sabella pavonina and Branchiomma vesiculosum are all readily obtained from the muddy shores of the Salcombe estuary, especially on the Salstone. Blood was taken directly from the vessels of about 100 assorted worms by syringe, and squirted as it was removed from the worms into a mixture of peroxide-free ether (3 parts) and ‘Analar’ glacial acetic acid (1 part). After all the blood had been added, the mixture was well shaken and allowed to stand in the ice-chest for 30 min. The acetic acid was then washed out with distilled water, the first few washings containing a little sodium acetate to avoid washing out of the pigment, and the remaining solution of chlorocruorohaematin dried roughly by filtering through ether-soaked paper into a distilling flask and evaporated to dryness. 100 ml. of a 50% solution of hydrazine hydrate in glacial acetic acid were then added, and the mixture heated on a water-bath at 90° C. for 10 min.

Isoxazole誘導体の研究 (第5報)

It has been found that some kinds of α-aminoisoxazole (I), when heated with hydrazine hydrate, undergo transition to its isomer, pyrazolone-(5) (III). By heating with aqueous solution of hydrazine hydrate, 3, 4-dimethyl-(IV), 3-methyl-4-ethyl-(V), 3-methyl-4-propyl-(IV), 3-methyl-4-benzyl-(VII), and 3, 4-tetramethylene-5-aminoisoxazole (VIII) yielded the corresponding isomeric pyrazolone-(5) compounds (IX), (X), (XI), (XII), and (XIII). By the similar procedure, (VIII) and phenylhydrazine yielded 1-phenyl-3, 4-tetramethylenepyrazolone-(5) (XIX), and (IV) and phenylhydrazine yielded bis-1-phenyl-3, 4-dimethylpyrazolone-(5) (XXII). It is considered that such transition occurred with the ring cleavage of (I) and reaction of hydrazine to form an intermadiate of a β-hydrazones (XXVI) of acid amide. The reaction has been termed, for the sake of convenience, as “pyrazolone transformation”.

Studies on Hydrazine: Heats of Solution of Hydrazine and Hydrazine Hydrate at 25°

Studies on Hydrazine: Heats of Solution of Hydrazine and Hydrazine Hydrate at 25°