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Carbon Disulfide (carbon + disulfide)
Selected AbstractsUV Laser-Induced Gas-Phase Copolymerization of Carbon Disulfide and EtheneMACROMOLECULAR RAPID COMMUNICATIONS, Issue 4 2004Radmila Tomovska Abstract Summary: The laser irradiation at 193 nm of a gaseous mixture of carbon disulfide and ethene induces the copolymerization of both compounds and affords the chemical vapour deposition of a C/S/H polymer, the composition of which indicates the reaction between two to three CS2 molecules and one C2H4 molecule. Polymer structure is interpreted on the basis of X-ray photoelectron and FT-IR spectra as consisting of >CS, >CC<, CH2CH2, (CC)SnC4,,,n, C(CS)S, S(CS)S, and CSSC configurations. The gas-phase copolymerization of carbon disulfide and ethene represents the first example of such a reaction between carbon disulfide and a common monomer. Scheme showing the expected reaction of excited CS2 molecules with other CS2 molecules to form dimers, which then react with another CS2 molecule or add to ethene. [source] ChemInform Abstract: One-Pot Synthesis of 4-Substituted Isothiochroman-1-thiones from ,-Substituted 2-Bromostyrenes and Carbon Disulfide.CHEMINFORM, Issue 50 2009Shuhei Fukamachi Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: A Simple and Novel Eco-Friendly Process for the Synthesis of Cyclic Dithiocarbonates from Epoxides and Carbon Disulfide in Water.CHEMINFORM, Issue 36 2009Azim Ziyaei Halimehjani Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: A Facile KF/Al2O3 -Mediated, One-Pot Synthesis of Symmetrical Trithiocarbonates from Alkyl Halides and Carbon Disulfide.CHEMINFORM, Issue 22 2008Barahman Movassagh Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Reaction Between Epoxides and Carbon Disulfide under Hydrotalcite Catalysis: Eco Compatible Synthesis of Cyclic Dithiocarbonates.CHEMINFORM, Issue 22 2008Raimondo Maggi Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Reactions of 3-Phenyl-8-triphenylphosphoimino-1-azaazulene with Aryl Isocyanate, Aryl Isothiocyanate, and Carbon Disulfide.CHEMINFORM, Issue 25 2005Kentaro Nagamatsu Abstract For Abstract see ChemInform Abstract in Full Text. [source] The Synthesis of Salts and Esters of Perfluorinated Dithio- and Thiocarboxylic Acids from Carbon Disulfide and Carbonyl Sulfide Reacting with RFSiMe3/F - .CHEMINFORM, Issue 45 2004Lesya A. Babadzhanova Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: Conjugated Addition Reaction of Amine, Carbon Disulfide to Electrophilic Alkenes in the Presence of Anhydrous Potassium Phosphate.CHEMINFORM, Issue 51 2001Baoguo Guo Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Two-photon Dissociation Study of Carbon Disulfide in Acetonitrile at 266 nmCHINESE JOURNAL OF CHEMISTRY, Issue 1 2006Hao-Jie Fang Abstract Using laser flash photolysis/transient absorption technique for the study of two photon photodissociation of carbon disulfide in acetonitrile solution at 266 nm, the transient UV-Vis absorption spectrum of Rydberg state CS2 (6s,g) within 240,370 nm and subsequent dissociation product CS (,3,) with the maximum absorption at 260 nm were directly observed. The lifetime of CS (,3,) in the nitrogen and oxygen saturated solution is also studied in our experiment. [source] Betaine Adducts of N-Heterocyclic Carbenes: Synthesis, Properties, and ReactivityEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 13 2009Lionel Delaude Abstract N-Heterocyclic carbenes (NHCs) form stable zwitterionicadducts with a range of heteroallenes, ketenes, and allenes. Although the first representatives of this class of inner salts were first investigated as far back as the 1960s, they have enjoyed a sustained interest from the chemical community over the years. Depending on the nature of their anionic moiety, NHC betaines display a very broad palette of reactivities and have found applications in various fields of organic synthesis and catalysis. In this Microreview, the synthesis, properties, and reactivity of NHC betaines are surveyed. The NHCs under consideration include ylidenes derived from imidazole, benzimidazole, imidazoline, thiazole, or triazole, and the heteroallenes investigated so far are carbon dioxide, carbon disulfide, isocyanates, isothiocyanates, and their selenium analogues. A historical background is provided for each type of adduct under consideration, but emphasis is placed mainly on developments that have appeared in the literature within the past few years. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] Assessing the Potential of Zwitterionic NHC·CS2 Adducts for Probing the Stereoelectronic Parameters of N-Heterocyclic CarbenesEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 13 2009Lionel Delaude Abstract Five imidazol(in)ium-2-dithiocarboxylates bearing cyclohexyl, mesityl, or 2,6-diisopropylphenyl substituents on their nitrogen atoms were prepared from the corresponding N-heterocyclic carbenes (NHCs) by reaction with carbon disulfide. They were characterized by IR, UV/Vis, and NMR spectroscopy, and by thermogravimetric analysis. Their molecular structures were determined by X-ray diffraction. For the sake of comparison, tricyclohexylphosphonium dithiocarboxylate was also examined. The data acquired were scrutinized to evaluate their usefulness for assessing the steric and electronic properties of NHC ligands. Because of their outstanding ability to crystallize, the five NHC·CS2 betaines were found to be highly suitable for probing the steric influence of nitrogen atom substituents on imidazolylidene-based ligand precursors via XRD analysis, while the corresponding NHC·CO2 adducts were deemed more appropriate for evaluating the ,-donating properties of carbene ligands.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] Catalysis by Ionic Liquids: Significant Rate Acceleration with the Use of [pmIm]Br in the Three-Component Synthesis of DithiocarbamatesEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 3 2008Brindaban C. Ranu Abstract An easily accessible neutral ionic liquid, 1-methyl-3-pentylimidazolium bromide, promoted a one-pot three-component condensation of an amine, carbon disulfide, and an activated alkene/dichloromethane/epoxide to produce the corresponding dithiocarbamates in high yields at room temperature. The reactions are very fast in ionic liquids relative to those in other reaction media. These reactions do not require any additional catalyst or solvent. The ionic liquid can be recovered and recycled for subsequent reactions. A plausible mechanism is suggested. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source] Studies on organophosphorus compounds: Synthesis and reactions of [1,2,4,3]triaza-phospholo[4,5- a]quinoxaline derivativeHETEROATOM CHEMISTRY, Issue 5 2008Hassan M. Moustafa 2,4-Bis-(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide (Lawesson's reagent) (1) reacted with 2-hydrazino-3-methyl-quinoxaline (2) to give [1,2,4,3]-triazaphospholo[4,5- a]quinoxaline derivative 3. The Mannich reaction using different amines on compound 3 gave Mannich bases 4a,d. Also, compound 3 reacted with formaldehyde to give the corresponding 2-hydroxymethyl derivative 5, which upon reaction with thionyl chloride gave the corresponding chloromethyl derivative 6. Treatment of compound 6 with some thiols yielded the corresponding sulfides 7a,d. Acylation of compound 3 gave acylated compounds 8a,b. Compound 9, which was prepared through the reaction of compound 3 with ethyl cyanoacetate, was investigated as a starting material for the synthesis of some new heterocyclic systems 10,13. Also, reaction of compound 9 with carbon disulfide and 2 equivalents of methyl iodide in a one-pot reaction yielded the corresponding ketene-S,S-acetal 14, which in turn reacted with bidentates to give some new heterocycles 15,17. © 2008 Wiley Periodicals, Inc. Heteroatom Chem 19:520,529, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20473 [source] Reactions of 2-amino-3-cyano-4,5,6,7-tetrahydrobenzo[b]thiophene and 2-amino-3-cyano-4,7-diphenyl-5-methyl-4H -pyrano[2,3- c] pyrazole with phenylisocyanate, carbon disulfide, and thioureaHETEROATOM CHEMISTRY, Issue 1 2005Ahmed S. A. Youssef 2-Amino-3-cyano-4,5,6,7-tetrahydrobenzo[b]thiophene 1a or 2-amino-3-cyano-4,7-di- phenyl-5-methyl-4H -pyrano[2,3- c]pyrazole 2a reacted with phenylisocyanate in dry pyridine to give 2-(3-phenylureido)-3-cyanobenzo[b]thiophene 1b or 2-disubstituted amino-3-cyanopyranopyrazole 2b derivative. However, when 1a and 2a were refluxed with carbon disulfide in 10% ethanolic sodium hydroxide solution, they afforded the thieno[2,3- d]pyrimidin-2,4-dithione derivative 5 in the former case, 2,4-dicyano-1,3-bis(dithio carboxamino)cyclobuta-1,3- diene 6 and pyrazolopyranopyrido[2,3- d]pyrimidin- 2,4-dithione derivative 7 in the latter one. Treatment of 2a with thiourea in refluxing ethanol in the presence of potassium carbonate gave 2,2,-dithiobispyrimidine derivative 9 (major) in addition to pyranopyrazole derivative 10 and 2,2,-dithiobis ethoxypyrimidine derivative 11 in minor amounts. The structures of all products were evidenced by microanalytical and spectral data. © 2005 Wiley Periodicals, Inc. Heteroatom Chem 16:6,11, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20070 [source] Heterocyclic synthesis containing bridgehead nitrogen atom: Synthesis of 3-[(2H)-2-oxobenzo[b]pyran-3-yl]- s -triazolo[3,4- b]-1,3,4-thiadiazine and thiazole derivativesHETEROATOM CHEMISTRY, Issue 2 2003M. A. Raslan The reaction of 2H-2-oxobenzo[b]pyran-3-hydrazide (2) with carbon disulfide in basic DMF afforded potassium thiocarbamate 3, which readily underwent heterocyclization upon its reaction with hydrazine and/or phenacyl bromide to yield 1,2,4-tiazole (4) and thiazole 7 derivatives, respectively. Condensation of 4 with substituted phenacyl bromide and/or chloranil gave 1,2,4-triazole[3,4-b]thiadiazine (5a,b) and 3,10-bis-[2H-2-oxobenzo[b]pyran-3-yl]-6,13-dichloro-bis-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazino[5,,6,-b:5,,6,-e]cyclohexa-1,4-diene (6), respectively. Cyclization of thiosemicarbazide 10 by refluxing it in sodium hydroxide and/or phosphoryl chloride afforded triazole 13 and thiadiazole 15 derivatives, respectively. Also, 10 reacted with phenacyl bromide in the presence of anhydrous sodium acetate to give the oxothiazolidine derivative 17. The structure of the synthesized compounds were confirmed by elemental analyses, IR, 1H NMR, and mass spectra. © 2003 Wiley Periodicals, Inc. Heteroatom Chem 14:114,120, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10109 [source] Organic and aqueous compatible polystyrene,maleic anhydride copolymer ultra-fine fibrous membranesJOURNAL OF APPLIED POLYMER SCIENCE, Issue 2 2009Corine Cécile Abstract Polystyrene,maleic anhydride copolymer (PSMA, Mv= 700 kDa) was synthesized and efficiently processed into 400 to 600 nm diameter fibers via electrospinning from either 20 wt % dimethylformamide or 25 wt % dimethylsulfoxide solution. Crosslinking of PSMA was effective by adding glycerol and poly(vinyl alcohol) (PVA) (Mw = 31,50 kDa) in the dimethylformamide and dimethylsulfoxide solutions, respectively. The PSMA fibers containing glycerol at 29.4 mol% were auto-crosslinked whereas those with 12.9 mol% (2 wt %) glycerol and 15.4 mol% (0.75 wt %) PVA required heating to induce intermolecular esterification. Heat-induced crosslinking with glycerol was more effective in rendering the PSMA fibrous membranes insoluble in all solvents whereas that with PVA remained soluble in most solvents except for acetone and tetrahydrofuran. The crosslinked fibrous membranes had improved thermally stability and retained physical integrity upon exposure (2 hr at 40°C) to carbon disulfide, the solvent for Friedel-Craft reactions of the styrene moiety. Hydrolysis (0.01N NaOH) of the auto-crosslinked fibrous membrane significantly improved its hydrophilicity by reducing the water contact angles from 90.6° to 62.5° in a matter of seconds. These ultra-high specific surface PSMA fibrous membranes have shown superior organic and aqueous solvent compatibility to be used as highly reactive and easily retrievable supports for solid-phase synthesis. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 [source] A simple and novel eco-friendly process for the synthesis of cyclic dithiocarbonates from epoxides and carbon disulfide in waterJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2009Azim Ziyaei Halimehjani The reaction of oxiranes with carbon disulfide for preparation of cyclic dithiocarbonates was carried out in water under catalytic amount of an organic base such as dimethylaminopyridine or triethylamine. The reaction conditions are simple and give high yields of desired products. J. Heterocyclic Chem., 46, 347 (2009). [source] Synthesis of 2-cyanoacrylates containing pyridinyl moiety under ultrasound irradiationJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 6 2005Huiping Zhang Reaction of ethyl cyanoacetate with carbon disulfide and dimethyl sulfate in the presence of sodium methoxide in anhydrous methanol yields ethyl 2-cyano-3,3-dimethyl- thioacrylate, followed by the nucle-ophilic substitution with 2-amino-3-chloro-4- methylpyridine under ultrasonic irradiation affording the key intermediate, ethyl 3-(2-chloro-4-methylpyridin-3-ylamino)-2-cyano-3-methylthioacrylate. The title compounds were then obtained through the reaction of the key intermediate with the aliphatic amine under reflux condition. All the new structures were verified by elemental analysis, IR, 1H NMR and mass spectra. In the MTT test, these new compounds were found to possess moderate antitumor activities against PC3 and A431 cells. [source] Reaction of tetraazathiapentalene and thiadiazolopyrimidine derivatives with heterocumulenes: Cycloaddition and elimination reactions via hypervalent sulfur intermediatesJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 1 2004Noboru Matsumura Tetraazathiapentalene derivative 1 reacts with heterocumulenes such as diphenylketene (2) and 2-pyridylisothiocyanate (5) to give heterocycles 3, 6 and 7 with elimination of methylisothiocyanate. The reactions of thiadiazolopyrimidine derivatives 8a-b with ethoxycarbonyl isothiocyanate (9) and carbon disulfide (11) gives heterocycles 10 and 12 via thermal decomposition of 1:1 cycloadducts C and D which have a hypervalent sulfur. The mechanistic and reactivity features of these reactions are described. [source] A convenient synthesis of 5- and 8-nitroquinazoline-2,4-dione derivativesJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2002D. Aziane 3-Nitrophthalic acid 1 was converted selectively to the two regioisomeric monoesters 2 and 3, which were subsequently transformed via Curtius rearrangement to the corresponding 5- and 8-nitroquinazoline-2,4-diones 4 and 5, respectively. The reduction of the nitro group produced 5- and 8-aminoquinazoline-2,4-diones 6 and 7, respectively, in good yields. The condensation of compounds 7b and 7c with carbon disulfide in pyridine afforded tricyclic derivatives 9, which are analogues of the HIV-1 reverse transcriptase inhibitor 4,5,6,7-tetrahydro-5-methylimidazo[4,5,1- jk][1,4]benzodiazepin-2(1H)-one(TIBO). [source] Synthesis, characterization, and antimicrobial activity of some novel poly(ether ketone)sJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 15 2003Samir A. Patel Abstract Low molecular weight poly(ether ketone)s were synthesized from phenol, 1,4-phenylenedioxy diacetylchloride, chloroacetylchloride, and dichloroalkanes [1,2-dichloroethane and dichloromethane] by a Friedel,Crafts reaction with anhydrous aluminum chloride as a catalyst and carbon disulfide as a solvent. The conditions for the preparation of the poly(ether ketone)s and the chlorine contents obtained with the Carius method were examined, and a reaction scheme for each resin was established. The molecular weights and polydispersities of the resins were obtained by gel permeation chromatography. The polyketones were characterized by IR spectroscopy. The characteristic frequencies due to different functional groups were assigned. The thermal properties of the resins were studied with thermogravimetry and differential scanning calorimetry. The characteristic temperatures of thermal degradation for the poly(ether ketone)s were evaluated with thermogravimetric analysis. The kinetic parameters for the decomposition reactions of the resins were obtained with Broido and Doyle's method, and the heats of fusion were obtained from differential scanning calorimetry thermograms. The polyketones were thermally stable up to 200 °C. All the polyketones were tested for their microbial properties against bacteria, fungi, and yeast. The effect of poly(ether ketone)s on the growth of these microorganisms was investigated, and the polyketones were found to inhibit the growth of the microorganisms to a considerable extent. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 2335,2344, 2003 [source] Modified headspace-SPME-GC device for sampling volatile compounds in acidic mediumJOURNAL OF SEPARATION SCIENCE, JSS, Issue 6-7 2003W. A. Araújo Abstract Most of the existing analytical methods for determining dithiocarbamate pesticide residues utilize an acid decomposition step, which promotes the release of carbon disulfide from the pesticide molecule. After release, the CS2 is sampled by static headspace techniques using gas-tight syringes and analyzed by gas chromatography with flame photometric detection (GC-FPD). In our search for faster analytical methodologies for sampling of volatile compounds we have used solid phase microextraction (SPME). However, evaluation of the commercially available SPME system for the analysis of CS2 obtained by decomposing dithiocarbamates showed it to be unsuitable for analysis in an acidic environment. The present communication reports the development of an appropriate device for sampling volatile compounds in an acidic environment by static headspace-SPME followed by GC-FPD. On examining the limitations of using a standard metal needle in HS-SPME sampling of analytes in acidic medium, a corrosion process was observed in both needle and fiber. A new double-needle device which avoids such corrosion problems was developed and built. The successful application of this device to the analysis of mancozeb in water samples is described. [source] UV Laser Deposition of SiS/Poly(thiacarbosilane) Composites and their Conversion to SiO/Poly(thiacarbosiloxane) CompositesMACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 16 2007Radmila Tomovska Abstract ArF laser irradiation of gaseous mixtures of carbon disulfide and silane allows efficient deposition of SiS bond-containing poly(thiacarbosilanes) incorporating SiS bodies. These SiS/poly(thiacarbosilane) composites are the first example of silicon sulfide/polymer composites. Composite formation is analyzed by GC/MS analysis of volatile products and the structure of the composite as determined by electron microscopy and FT-IR spectra. The composites undergo reaction with air moisture and methanol vapor, evolve H2S and evolve to nano-sized poly(thiacarbosiloxane)s and poly(methoxythiacarbosiloxane)s. [source] UV Laser-Induced Gas-Phase Copolymerization of Carbon Disulfide and EtheneMACROMOLECULAR RAPID COMMUNICATIONS, Issue 4 2004Radmila Tomovska Abstract Summary: The laser irradiation at 193 nm of a gaseous mixture of carbon disulfide and ethene induces the copolymerization of both compounds and affords the chemical vapour deposition of a C/S/H polymer, the composition of which indicates the reaction between two to three CS2 molecules and one C2H4 molecule. Polymer structure is interpreted on the basis of X-ray photoelectron and FT-IR spectra as consisting of >CS, >CC<, CH2CH2, (CC)SnC4,,,n, C(CS)S, S(CS)S, and CSSC configurations. The gas-phase copolymerization of carbon disulfide and ethene represents the first example of such a reaction between carbon disulfide and a common monomer. Scheme showing the expected reaction of excited CS2 molecules with other CS2 molecules to form dimers, which then react with another CS2 molecule or add to ethene. [source] A study of the electrospray ionisation and ion-trap fragmentation of [M,,,H], ions of new 3,5-disubstituted tetrahydro-2H -1,3,5-thiadiazin-2-thionesRAPID COMMUNICATIONS IN MASS SPECTROMETRY, Issue 10 2001Roberto Martínez-Alvarez The electrospray ionisation (ESI) in negative mode of the pharmacologically significant 3,5-disubstituted tetrahydro-2H -1,3,5-thiadiazin-2-thiones, and their subsequent fragmentations using an ion-trap mass spectrometer, have been investigated. Experiments on sequential product ion fragmentations (MSn) were performed in order to elucidate the degradation pathways for these compounds. The data presented show that the fragmentation of the even-electron [M,,,H], ions could proceed through an internal nucleophilic substitution displacement. Decarboxylation and extrusion of carbon disulfide are other fragmentations observed. Copyright © 2001 John Wiley & Sons, Ltd. [source] Two-photon Dissociation Study of Carbon Disulfide in Acetonitrile at 266 nmCHINESE JOURNAL OF CHEMISTRY, Issue 1 2006Hao-Jie Fang Abstract Using laser flash photolysis/transient absorption technique for the study of two photon photodissociation of carbon disulfide in acetonitrile solution at 266 nm, the transient UV-Vis absorption spectrum of Rydberg state CS2 (6s,g) within 240,370 nm and subsequent dissociation product CS (,3,) with the maximum absorption at 260 nm were directly observed. The lifetime of CS (,3,) in the nitrogen and oxygen saturated solution is also studied in our experiment. [source] | |||||||||||||