Phenyl 2-(6-methylpyridyl) ketone oxime A reagent for copper in alkalis

Phenyl 2-(6-methylpyridyl) ketone oxime (R) can be used for the determination of copper in alkalis, the orange CuR, being extracted into isoamyl alcohol and its absorbance measured. Owing to the stereochemical blocking action of the 6-methyl group, iron does not interfere. In acid solution an orange-yellow compound CuR(3), is formed, also extractable into isoamyl alcohol.     

2,5-Dihydroxyacetophenone oxime as an analytical reagent for the amperometric determination of copper,palladium, and nickel

Summary Copper, palladium and nickel can be titrated amperometrically with 2,5-dihydroxyacetophenone oxime at –0.15, –0.4 and, –1.2 V vs. S. C. E. respectively, the optimum p_H values being 4.6, 4.0, and 9.0. Alkali and alkaline earth metals, Al, Bi, Cd, Co, Cr. Fe(II), Hg, Mn, Ni, Pb, Th, Zn, UO, W, and Zr do not interfere with the estimation of copper and palladium. The interferences due to the presence of silver and iron(III) can be eliminated by adding excess of KCl and KF respectively. Most heavy metals interfere with the estimation of nickel and should be eliminated before titration.

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Zusammenfassung Kupfer, Palladium und Nickel können mit 2,5-Dihydroxyaeetophenonoxim bei –0,15, –0,4 bzw. –1,2 V gegen eine gesättigte Kalomelelektrode amperometrisch titriert werden, wobei man das p_H am besten auf 4,6, 4,0 bzw. 9,0 hält. Alkalimetalle, Erdalkalien, Al, Bi, Cd, Co, Cr, Fe(II), Hg, Mn, Ni, Pb, Th, Zn, UO₂, W und Zr stören die Bestimmung des Kupfers und des Palladiums. Silber und Eisen können mit Kaliumchlorid gefällt bzw. mit Kaliumfluorid maskiert werden. Die meisten Schwermetalle stören die Nickelbestimmung und müssen daher vor der Titration entfernt werden.

     

n-Pentyl-2-pyridyl ketoxime as a selective colorimetric reagent for copper

n-Pentyl-2-pyridyl ketoxime hydrochloride has been prepared and examined as a colorimetric reagent for copper. It is less sensitive than some reagents, but shows a remarkable selectivity toward copper. The copper(I) -oxime compound can be extracted into isoamyl alcohol or into chloroform. In isoamyl alcohol the colored compound conforms to Beer's law in concentrations up to 5.6 · 10^-4M and has a molar absorptivity of 2650 at 360 mμ. A procedure for the colorimetric determination of copper is given and its reliability is shown.     

5-Methyl-2-propargylthio-3-thiophenecarbaldehyde oxime in the synthesis of new S,N-containing fused heterocycles

5-Methyl-2-propargylthio-3-thiophenecarbaldehyde oxime is a convenient synthon for the synthesis of fused tricyclic systems containing annelated thiophene, thiopyran (dihydrothiopyran), and isoxazoline (isoxazole) rings.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 532–534, March, 1993.     

Fast Navy 2 R as a colorimetric reagent for the determination of copper, manganese and zinc

Summary Solochrome Fast Navy 2R has been found to be a suitable colorimetric reagent for the determination of copper, manganese and zinc either in pure solutions or in mixtures. The range of determination varies between 0.5–4 g/25 ml. Study of the effect of time, temperature, p_H on the determination was carried out. The molecular ratio of the dyemetal complex was investigated using the slope ratio method.Tables for the various determination are given and show that the experimental errors are of satisfactory order. Good results were obtained by the use of EDTA, cyanide or thioglycollic acid to mask the various interfering cations.

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Zusammenfassung Solochrome Fast Navy 2R wird zur colorimetrischen Bestimmung von Kupfer, Mangan und Zink in reinen Lösungen oder in Mischungen empfohlen. Die erfaßbaren Mengen liegen im Bereich zwischen 0,5 und 4 g/25 ml. Die Genauigkeit der Ergebnisse ist befriedigend. Der Einfluß der Zeit, der Temperatur und des p_H-Wertes sowie das Molverhältnis im Metall-Farbstoff-Komplex wurden untersucht. Verschiedene störende Kationen konnten erfolgreich mit ÄDTA, Cyanid oder Thioglykolsäure maskiert werden.

     

Hydrazinium thiocyanate as a reagent for determination of copper

Hydrazinium thiocyanate, N(2)H(5)SCN, has been used for the determination of copper in copper salts. The reagent reduces the copper ions to the cuprous state and precipitates cuprous thiocyanate Cu(2)(SCN)(2), quantitatively.     

2-甲基-6-乙酰基萘结构的表征

2-甲基-6-乙酰基萘是一种有发展前景的化工产品。本实验在合成和精制的基础上,采用气相色谱、质谱、^1H、^13C及二维核磁共振技术表征了2-甲基-6-乙酰基萘的结构,首次给出了该化合物的化学位移数据。     

2-甲基-6-异丙基萘的分子筛催化合成、分离提纯和结构表征

2,6-二烷基萘的氧化产物2,6-萘二甲酸与乙二醇反应得到的聚2,6-萘二甲酸乙二醇酯(PEN),是一种具有广阔市场前景的新一代聚酯产品,其开发的关键在于降低2,6-二烷基萘的生产成本[1~3]。利用裂解重油的2-甲基萘副产烷基化获得2,6-二烷基萘,将大大降低PEN的生产成本,同时也帮助石化     

Di-2-pyridyl ketone oxime in copper chemistry: di-, tri-, penta- and hexanuclear complexes

The use of di-2-pyridyl ketone oxime (Hpko)/X- "blends" (X- = OH-, Cl-, ClO4-) in copper chemistry has yielded neutral binuclear and cationic trinuclear, pentanuclear or hexanuclear complexes. Various synthetic procedures have led to the synthesis of compounds [Cu5(pko)7].[ClO4]3.2CH3OH.2H2O (1), [Cu3(pko)3(OH)(Cl)]2[Ph4B]2.4DMF.2H2O (2), [Cu2(pko)4] (3), {[Cu6(pko)6ClO4(CH3CN)6][Cu6(pko)6(ClO4)3(CH3CN)4]}.8ClO4.14CH3CN.H2O (4). The structures of the complexes have been determined by single-crystal X-ray crystallography.     

Benzothiazole-2-aldehyde-2-quinolylhydrazone as a reagent for the extractive spectrophotometric determination of copper (II)

Benzothiazole-2-aldehyde-2-quinolylhydrazone (BTAQH) was used for the spectrophotometric determination of trace amounts of copper(II) after the extraction process. Copper(II) reacts with BTAQH at pH 8.3–12.6 to form a water-insoluble 1:2 complex, which can be extracted with many kinds of organic solvent. The extracted species with benzene has an absorption maximum at 523 nm and obeyed Beer's law over the range 0.09 to 0.75 ppm of copper. The molar absorptivity is 7.50 × 10⁴M^?1 cm^?1 at 523 nm. The spectral properties of the copper(II) complexes with some tridentate hydrazones containing benzothiazole ring as a functional group were also discussed.     

N-Acetylacetone-anthranilic acid as a gravimetric reagent for copper(II)

N-Acetylacetone-anthranilic acid has been employed as a reagent for the gravimetric determination of copper(II). The solid copper(II) chelate formed possesses 1:1 metal-ligand stoichiometry and is found to exist as an unsolvated dimer. The complex has a magnetic moment of 1.88 B.M. at 298 K. A non-planar dimeric structure is suggested to explain the observed facts.     

1-Methyl-3-hexadecyl-2-(oximinomethyl)imidazolium bromide as a new highly efficient,low-basicity reagent for the decomposition of acyl-containing ecotoxicants

A new low-basicity functional detergent, namely, 1-methyl-3-hexadecyl-2-(oximinomethyl)imidazolium bromide (pK _a = 7.74) is proposed for the efficient decomposition of acyl-containing ecotoxicants under mild conditions (pH ≈ 9.0). The use of this compound provides for rapid decomposition of model substrates, namely, 4-nitrophenyl esters of diethylphosphonic, diethylphosphoric, and 4-toluenesulfonic acids. The title compound is not less efficient than high-basicity supernucleophilic functional detergents with pK_a; 10.0.     

2-甲基-6-对甲苯基-1,6-庚二烯的合成

以对甲苯乙酮(1)为原料,经烯醇硅醚化,Lewis酸催化Michael加成反应和Wittig反应,合成了新倍半萜烯化合物2-甲基-6-对甲苯基-1,6-庚二烯。     

Synthese und Kristallstruktur der Hydroxy-lactone von 6-Methyl-2-propionyl- und 3-Methyl-2-propionylbenzoesäure

The isomers 6-methyl-2-propionyl- and 3-methyl-2-propionylbenzoic acid were synthesized and separated by DCC (droplet counter-current) chromatography. The crystal structure analyses showed that these compounds are hydroxylactones in the solid state.