Flotation of copper-bearing carbonaceous shale in the presence of amine type frothers

<p>Hexylamine, chloro-derivative of propylamine, and ammonium chloride were used for flotation of Permian carbonaceous copper bearing shale from the Legnica-Glogow Copper Basin region in SW Poland. It was confirmed that naturally hydrophobic shale, known as Kupferschiefer, can be made floatable by application of short chain amines as frothers. It was also established that the short chain amine chloro-derivatives as well as salmiac, the first member of the amine family, can be used as a frother for flotation of the investigated shale sample. It results from the paper that the investigated amine frothers work similarly if the comparison of the flotation results is made using their concentration expressed in relative form taking into account the critical coalescence concentration of the frother.</p>

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Neuartige Allylboran- und Allyldiboran(4)-Derivate / Novel Allylboran- and Allyldiboran(4) Derivatives

Zeitschrift für Naturforschung B ◽

10.1515/znb-1990-0712 ◽

1990 ◽

Vol 45 (7) ◽

pp. 985-988 ◽

Cited By ~ 6

Author(s):

Gabriele Knörzer ◽

Hermann Seyffer ◽

Hans Pritzkow ◽

Walter Siebert

Keyword(s):

Structure Analysis ◽

X Ray ◽

Chloro Derivative ◽

Chloro Derivatives ◽

Derivatives Of

Allyldiboran(4) derivatives la—c are obtained from allylmagnesium chloride and chloro derivatives of diboran(4). la—c are air-sensitive liquids; heating of le did not yield a 2,3-dihydro-l,2-diborole derivative (B). Reaction between 1,1-bis(dichloroboryl)-3,3-dimethyl-butane (5) and H2C=C(CH2SnMe3)2 (4) leads to the heat-sensitive chloro derivative 2a, in which the chlorine is substituted by Me3SiNMe2 to give stable 1,3-bis-dimethylamino-5-methylene-2-neopentyl- 1,3-diborinane (2 b). 1,2-Bis(dichloroboryl)benzene and 4 yield the chloro derivative 3a, and its substitution with HN(i-Pr)2 leads to 1,4-bis(diisopropylamino)-2,3-benzo-6-methylene-1,4,5,7-tetrahydro-1,4-diborepine (3 b). The X-ray structure analysis reveals a folded tetrahydro-1,4-diborepine ring.

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2',3'-O-Carbonyl derivatives of 6-azauridine in the synthesis of its 5-substituted and 5'-deoxy derivatives

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19872070 ◽

1987 ◽

Vol 52 (8) ◽

pp. 2070-2082

Author(s):

Pavel Drašar ◽

Jiří Beránek

Keyword(s):

Thionyl Chloride ◽

Alkaline Hydrolysis ◽

Triphenyl Phosphine ◽

Carbonyl Derivatives ◽

Tributyltin Hydride ◽

Chloro Derivative ◽

Ammonium Halides ◽

Chloro Derivatives ◽

Derivatives Of ◽

Dichloro Derivative

Preparation of 2',3'-O-carbonyl derivatives of 5'-deoxy-6-azauridine and 6-azauridine using 1,1'-carbonyldiimidazole has been elaborated. 5'-Chloro and 5'-bromo derivatives were prepared by treatment of the 5'-O-mesyl derivative with quaternary ammonium halides, 5'-chloro derivatives also by direct halogenation with thionyl chloride in hexamethylphosphortriamide or with tetrachloromethane, triphenyl phosphine, and dimethylformamide. Derivatives of 5'-bromo-6-azauridine were reduced with tributyltin hydride to 5'-deoxy-6-azauridine compounds. 6-Azauridine 2',3'-carbonate (IVa) and its 5'-derivatives IVc and IVe on treatment with imidazole in dimethylformamide afforded 2,2'-anhydronucleosides IIIa-IIIc. The 2,2'-anhydro-5'-deoxy compound IIIc underwent alkaline hydrolysis to 5'-deoxy-1-β-D-arabino-pentofuranosyl-6-azauracil (VIa). Treatment of 2,2'-anhydro-5'-deoxy-5'-chloro derivative IIIb with hydrogen chloride led to 2',5'-dichloro derivative If.

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Synthesis and reactions of 2-and 4-substituted furo[3,2-c]pyridines

Chemical Papers ◽

10.2478/s11696-006-0041-9 ◽

2006 ◽

Vol 60 (3) ◽

Cited By ~ 5

Author(s):

M. Búdová ◽

K. Fojtíková ◽

J. Miklovič ◽

V. Mrázová ◽

B. Horváth ◽

...

Keyword(s):

Nucleophilic Substitution ◽

Hydrazine Hydrate ◽

Chlorine Atom ◽

Phosphorus Oxychloride ◽

Sodium Ethoxide ◽

Secondary Amines ◽

Chloro Derivative ◽

Chloro Derivatives ◽

Derivatives Of

AbstractSubstituted furopropenoic acids were prepared from appropriate aldehyde under the Doebner’s conditions. Obtained acids were converted to the corresponding azides, which were cyclized by heating in Dowtherm to furopyridones. These compounds were aromatized with phosphorus oxychloride to chloro derivatives of furo[3,2-c]pyridine (Va, Vb). Chloro derivative Vb was reduced with hydrazine hydrate to 2-(4-aminophenyl)furo[3,2-c]pyridine in ethanol and Pd/C as a catalyst. Chloro derivative Va was converted to 4-amino-2-(3-pyridyl)furo[3,2-c]pyridine under the same conditions. The chlorine atom in other chloro derivatives (VIIa, VIIb) was replaced by nucleophilic substitution with alkoxides (sodium ethoxide, propoxide, and isopropoxide) and the corresponding alkoxy derivatives were formed. By reaction of VII with cyclic secondary amines (morpholine, piperidine, and pyrrolidine) 4-substituted furopyridines were prepared.

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Chemical behaviour of dicyanocob(III)yrinic acid heptamethyl ester and cob(I)yrinic acid heptamethyl ester in some preparative experiments

Philosophical Transactions of the Royal Society of London Series B Biological Sciences ◽

10.1098/rstb.1976.0018 ◽

1976 ◽

Vol 273 (924) ◽

pp. 327-333 ◽

Cited By ~ 4

Keyword(s):

Absorption Spectra ◽

Electronic Absorption ◽

Electronic Absorption Spectra ◽

Chloro Derivative ◽

Chemical Behaviour ◽

Chloro Derivatives ◽

Derivatives Of

Preparations of CIO acetate, trifluoroacetate, and chloro derivatives of dicyano-cobyrinic acid heptamethyl ester (cobester) are described. The nature and properties of intermediates in the synthesis of the 10-chloro derivative are discussed, and the electronic absorption spectra of the products are presented.

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Effect of short-chain fatty acids on the ethylene pathway in embryonic axes of Cicer arietinum during germination

Physiologia Plantarum ◽

10.1034/j.1399-3054.1994.920413.x ◽

1994 ◽

Vol 92 (4) ◽

pp. 629-635 ◽

Cited By ~ 1

Author(s):

Mercedes Gallardo ◽

Paloma Munoz De Rueda ◽

Angel Jesus Matilla ◽

Isabel Maria Sanchez-Calle

Keyword(s):

Fatty Acids ◽

Cicer Arietinum ◽

Short Chain Fatty Acids ◽

Short Chain ◽

Embryonic Axes ◽

Chain Fatty Acids

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The potential use of short chain peptides in parenteral nutrition

Clinical Nutrition ◽

10.1016/s0261-5614(85)80013-3 ◽

1985 ◽

Vol 4 ◽

pp. 116-123 ◽

Cited By ~ 3

Author(s):

P STEHLE ◽

S ALBERS ◽

I AMBERGER ◽

P PFAENDER ◽

P FURST

Keyword(s):

Parenteral Nutrition ◽

Short Chain ◽

Potential Use

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Polarimetric radar processing of AIRSAR imagery from Los Angeles basin region

10.32469/10355/10128 ◽

2009 ◽

Author(s):

Andrew T. Hedrick

Keyword(s):

Los Angeles ◽

Polarimetric Radar ◽

Los Angeles Basin ◽

Basin Region

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ALDOSTERONE STIMULATION IN VITRO

Acta Endocrinologica ◽

10.1530/acta.0.0500301 ◽

1965 ◽

Vol 50 (2) ◽

pp. 301-309 ◽

Cited By ~ 13

Author(s):

Jürg Müller

Keyword(s):

Ammonium Chloride ◽

Human Urine ◽

Incubation Medium ◽

The Other ◽

Ammonium Ions ◽

Response Curves ◽

Urine Extract ◽

Similar Dose ◽

Aldosterone Production

ABSTRACT An extract of human urine, which was previously shown to stimulate aldosterone production by rat adrenal sections, was further purified. Evidence was obtained that its aldosterone-stimulating effect was due to the presence of ammonium ions. Addition of ammonium chloride and of urine extract to the incubation medium caused identical increases in aldosterone production in vitro. In addition to ammonium ions, rubidium and caesium ions also stimulated aldosterone production up to 250% that of control values without a significant effect on corticosterone production. Similar dose-response curves were obtained when increasing concentrations of potassium, ammonium, rubidium and caesium ions were tested. Aldosterone production was maximal at concentrations of 7 mval/1 and was significantly lower at higher concentrations. When ammonium chloride and ACTH were simultaneously added to the incubation medium, the production of aldosterone and of corticosterone was lower than with ACTH alone. On the other hand, the stimulating activity on aldosterone and corticosterone production by »TPN« (NADP) and glucose-6-phosphate was enhanced by the simultaneous addition of ammonium chloride.

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