Xanthate Research Articles

Synthesis and characterization of original fluorinated bis-cyclic carbonates and xanthates from a fluorinated epoxide

The development of efficient methods for the cycloaddition of CX2 (carbon dioxide (X=O) or carbon disulfide (X=S)) with fluorinated epoxides to produce five-membered cyclic carbonates (CCs) or cyclic xanthates (XAs) is a very attractive topic. In this work, the cycloaddition of CX2 with hexafluoropropene oxide (HFPO) was performed in the presence of a lithium bromide (LiBr) catalyst and optimized in terms of temperature, solvent, pressure, and reaction time. Then, the optimized conditions were tried in the cycloaddition of CX2 with 2-(trifluoromethyl)oxirane (TFEO) for reproducibility, leading to the corresponding products in high yields. Finally, two original fluorinated five-membered bis-CCs and bis-XAs were synthesized in high yields (85 and 87%) by reacting CX2 with 1,4-bis(2 ′ ,3 ′ -epoxypropyl) perfluorobutane (BEPFB). All of the resulting compounds were characterized by FTIR, 1H, 19F, and 13C NMR spectroscopy.

β-C(sp2)–H alkylation of enamides using xanthate chemistry

Access to the γ-amino-β,γ-unsaturated acyl scaffold was established by applying xanthate chemistry to enamides.

Disposable Electrochemical Sensor for Rapid Determination of Ethyl Xanthate in the Mining Industry

AbstractXanthate is a widely used reagent in sulfide mineral flotation. A simple and reliable method is presented for the direct monitoring of xanthate in flotation baths and their effluents, as a tool for their reconditioning, and reducing their environmental impact. For this purpose, screen‐printed graphite electrodes (SPE) were modified with a polyelectrolyte‐surfactant matrix which was able to adsorb the xanthate, whose concentration is determined by electrochemical impedance spectroscopy (EIS) following the change in the electron transfer resistance of ferrocyanide after a pre‐oxidation treatment. Linear ranges from 0.25 to 1 μM and 15 to 100 μM were determined for effluents and flotation baths, respectively. A mechanism for the electron transfer process is proposed based on Quartz crystal microbalance, IR and cyclic voltammetry studies.

The comparison between novel reagent H-142, H-143, H-145 and xanthate for flotation behaviour of molybdenum-containing ores

DOI: http://dx.doi.org/10.5564/mjc.v13i0.160 Mongolian Journal of Chemistry Vol.13 2012: 46-48

The structures of strontium xanthates Sr(S2COR)2·xROH (R=Et, Pri, But)

AbstractThe first structures of strontium xanthates Sr(S

Crystal and Molecular Structures of Two 1:1 Adducts of bis(O-ethyl dithiocarbonato-S,S′)manganese(II): Mn(S2COCH2CH3)2 (1,10-phenanthroline) and Mn(S2COCH2CH3)2 (2,2′-bipyridyl)

Distorted octahedral coordination geometries based on a N2S4 donor set are found in each of the molecular structures of the title complexes Mn(S2COCH2CH3)(2) (1,10-phenanthroline) (1) and Mn(S2COCH2CH3)(2) (2,2'-bipyridyl) (2) Analyses of the geometric parameters indicate that the five-membered ring in (1) has significantly more aromatic character than the analogous ring in (2) In terms of coordination of the xanthate ligands, one ligand in (1) is considerably more aromatic than the remaining ligands This latter feature allows for the formation of C-H pi (S2C) interactions leading to a supramolecular chain in (1) By contrast, in (2), the crystal packing is dominated by C-H O contacts, which lead to a supramolecular chain with 41 symmetry, which combine with C-H S contacts to consolidate the three-dimensional architecture Unit cell data for (1) hexagonal, space group (R) over bar3, a = 35 228(5) and c = 9 0086(13) angstrom, and for (2) tetragonal, space group 14(1)/a, a = 31 120(7) and c = 8 306(2) A

S‐Alkyl Chlorothioformates from Xanthates.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Effect of Depressants on Xanthate Adsorption on Pentlandite and Pyrrhotite: Single vs Mixed Minerals

Xanthate interaction with pentlandite and pyrrhotite has been investigated using single and mixed mineral systems in the presence of sodium meta-bisulfite (MBS) and/or diethylenetriamine (DETA). Dixanthogen was identified as the main adsorption product on both minerals and its surface concentration was consistently higher on pentlandite than on pyrrhotite. Physical contact between the two minerals in suspension promoted dixanthogen formation on pentlandite at the expense of depressing its formation on pyrrhotite. DETA, MBS and DETA plus MBS reduced the dixanthogen adsorption on both minerals, with a decreasing effect from DETA plus MBS to DETA and finally MBS alone. For pentlandite in the mixed mineral system, DETA in combination with MBS reduced dixanthogen adsorption to a level similar to that in a single mineral system without depressants. The enhancement in dixanthogen formation on pentlandite by physical contact of the minerals is preserved on addition of depressants which reduce the absolute dixanthogen adsorption on pyrrhotite perhaps below a critical level for flotation. © 1999 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reservedRé suméOn a examiné l'interaction du xanthate avec la pentlandite et la pyrrhotine en utilisant des systèmes à minéraux simples et mixtes, en présence de meta-sulfite acide de sodium (MBS) et/ou de traimine diethylenique (DET A). On a identifie le dixanthogene comme etant le produit principal d'adsorption sur les deux minéraux. Sa concentration de surface était uniformement plus élevée sur la pentlandite que sur la pyrrhotine. Le contact physique entre les deux mineraux en suspension stimulait la formation du dixanthogene sur la pentlandite aux depens de la pyrrhotine. Le DETA, le MBS, puis le DETA plus MBS réduisaient l'adsorption du dixanthogène sur les deux minéraux, avec un effet decroissant du DETA plus MBS, du DETA et, finalement, du MBS seul. Pour ce qui est de la pentlandite dans le système à minéraux mixtes, le DETA combine avec le MBS réduisait l'adsorption du dixanthogéne a un niveau similaire à celui d'un système a minéral simple sans agents dçprimants. L'amelioration de la formation de dixanthogene sur la pentlandite par contact physique des mineraux est preservee par l'addition d'agents deprimants qui reduisent l'adsorption absolue du dixanthogene sur la pyrrhotine, peut-etre sous un niveau critique pour la flottation. © 1999 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reserved

Synthesis of glycofuranosides from S-glycofuranosyl dithiocarbonates (xanthates) and dithiocarbamates

Synthesis of glycofuranosides from S-glycofuranosyl dithiocarbonates (xanthates) and dithiocarbamates

Oxidation of Amyl Xanthate by Pentlandite

AbstractThe reaction of amyl xanthate in solution in the presence of pentlandite was studied in a waterethanol mixed solvent. Compared with water only, this solvent kept all products in the solution while maintaining the same u.v. spectra, making it well suited to the study. Rapid oxidation of xanthate to dixanthogen was found, which appeared to be catalytic as no reaction products could be extracted (with hexane) from the pentlandite surface. Resume La reaction de amyl xanthate en solution avec pentlandit a ete etudiee dans un solvant melange d'eau et d'alcool ethylique. Quand ce solvant est compare a l'eau distillee seulement, on trouve que le melange a garde dans la solution tous les produits du reaction, et il a conserve le meme spectra d'ultraviolet, qui reussit a adapte pour recherche. On a trouve que l'oxydation de xanthate a dixanthogen est rapide. Il partait comme la reaction catalytique a cause de par pentland it aucun produits du reaction a ete extrait.

Synthesis of [ArTe(DTC/XNT)(NaDTC/XNT)] (DTC = dithiocarbamate and XNT = xanthate) through ligand substitution reactions of arylbis(thiosemicarbazone)tellurium(II) chloride

[ArTe(XTSC) 2]Cl (XTSC = benzaldehyde/salicylaldehyde thiosemicarbazone) reacts with sodium salts of dithiocarbamates (DTC) and xanthates (XNT) in a 1 : 2 molar ratio resulting in the formation of [ArTe(DTC/XNT)(NaDTC/XNT)]. IR, 1H and 13C NMR spectral data of these tellurium(II) complexes in conjunction with their elemental analyses, molecular weights and conductance in solution suggest that the two CSS- groups coordinate in different ways. One is probably in the η 2-mode and the other in either asymmetrically chelated or essentially in the η 1 mode. They do not exhibit conductance, probably due to strong NaS association and exist as monomers in solution.

Interference of xanthate compounds with phorbol ester TPA-induced changes of phospholipid metabolism: inhibition of prostaglandin production

Mecanisme d'action sur la lignee cellulaire HeLa, de l'inhibition de l'activite cancerigene du phorbol acetate-13, myristate-14, par MW 266 et MW 158, deux derives xanthates

ChemInform Abstract: Tri‐n‐butyltin Hydride‐Assisted Highly Stereoselective Lactonization of Homoallylic Xanthates.

AbstractTreatment of the xanthates (I), (VIII), and (X) with tributyltin hydride/AIBN results in cyclization, forming the thionolactones (II), (IX), and (XI).

ChemInform Abstract: 4‐Dimethylaminopyridine N‐Oxide as an Excellent Catalyst for Thione to Thiol Rearrangement of Xanthates.

AbstractThe O,S‐dialkyl dithiocarbonates (I) undergo rearrangement in the presence of 4‐dimethylaminopyridine N‐oxide to give a mixture of the symmetrical and asymmetrical S,S‐dialkyl dithiocarbonates (II) ‐ (IV).

ChemInform Abstract: Triphenyltelluronium Alkoxydes, Xanthates and Thioxanthates

ChemInform Abstract: Triphenyltelluronium Alkoxydes, Xanthates and Thioxanthates

ChemInform Abstract: Methylmercury Xanthates.

AbstractThe compounds (I) were prepared from the facile 1 :l reaction of MeHgCl in CH2Cl2 and KISZCOR] in water (20°C, 30 min).

Methylmercury xanthates

Methylmercury xanthates

Effect of reducing ions on absorption of xanthate by tennantite

Effect of reducing ions on absorption of xanthate by tennantite

Xanthates of sulfur: Their possible role in flotation

Xanthates of sulfur: Their possible role in flotation

Conversion of Xanthates toO,O-Dialkyl Thiocarbonates

Conversion of Xanthates to<i>O</i>,<i>O</i>-Dialkyl Thiocarbonates