Showing papers on "Dithiocarbamate published in 1982"

N -( o-CARBOXYBENZYL) CHITOSAN, N-CARBOXYMETHYL CHITOSAN AND DITHIOCARBAMATE CHITOSAN: NEW CHELATING DERIVATIVES OF CHITOSAN

Abstract: Dithiocarbamate chitosan, an insoluble derivative obtained from carbon disulfide, and N-(o—carboxybenzyl) chitosan and N—car— boxymethyl chitosan, two water—soluble olyamoholytes obtained from phthalaldehydic acid and glyoxylic acid, can be used for removal of metal ions from dilute solutions. Their characteristic properties are described in terms of infrared, ultraviolet and circular dichroism spectrometry, alkalimetry, metal ion collection percentage and metal ion capacity. The new polyampholytes form insoluble chelates upon addition of their solutions to metal ion solutions.

Tungsten carbonyl complexes with dithiocarbamate ligands

Abstract: The orange seven-coordinate complexes W(S2CNR2)2(CO)3 (R = Me, Et) have been prepared by the reaction of WBr2(CO)4 and NaS2CNR2. The tricarbonyl complexes were converted into the coordinatively unsaturated complexes W(S2CNR2)2(CO)2 by reflux in methanol. The compounds provide a new route into carbonyl dithiocarbamato complexes of tungsten and their reactions with various N- and P-donor ligands have given the new complexes W(S2CNR2)2(CO)2L (R = Me,Et; L = NH2NHMe, NH2NMe2, NH3, NH2NHCOPh, C5H5N, NH2NHSO2C6H4Me, PPh3) and bridged species [W(S2CNR2)2(CO)2]2-.μ-B (B = N2H4, NH2CH2CH2NH2). The synthesis and the 1H n.m.r, and infrared spectra of the compounds are presented and discussed. The electronic spectra of W(S2CNR2)2(CO)3 and W(S2CNR2)2(CO)2 are also reported.

Reduction potentials of thiuram disulfide/dithiocarbamate couples in acetone/water

Abstract: Reduction potentials relative to the saturated calomel electrode, Eo, of a series of thiuram disulfide/ dithiocarbamate couples have been measured in 30% v/v water in acetone and at ,μ 0.2 moll-1 (NaNO3) by a combination of potentiometric measurements and equilibrium constant determinations for thiolate/disulfide interchange reactions. Eo values lie in the range -250 to -340 mV which place dithiocarbamates as intermediate between thiophenolate (Eo - 540 mV) and ethylxanthate (Eo -206 mV) in reducing properties. The significant effect on EO of varying the substituents on the nitrogen in the dithiocarbamates correlates with the substituent effects on the acid dissociation constants of the parent dithiocarbamic acid and with trends in the half-wave potentials for metal-based oxidation and reduction of transition metal dithiocarbamate complexes.

ADDITION OF ORGANOMETALLICS ON α,β-UNSATURATED THIOCARBONYL COMPOUNDS II. MICHAEL ADDITION OF LITHIUM ENOLATES ON THIOAMIDE AND DITHIOCARBAMATE VINYLOGS AND THIOAROYLFORMAMIDINE

Abstract: α,β-Unsaturated thiocarbonyl compounds substituted by a secondary amino group in position β, such as thioamide vinylogs, dithiocarbamate vinylogs or thioaroylformamidines react with lithium enolates of esters, ketones or amides to give 1,4-addition compounds. In the presence of magnesium bromide 1,4-adducts undergo an intramolecular cyclization to give 2H-thiopyranones. Methylation of the 1,4-adducts is followed by a stereospecific elimination of the amine and leads to (1-Z)-1,3-dienic carbonyl compounds: with thioamide vinylogs, δ-methylthio-α,β,γ,δ-diethylenic ketones, esters and amides are obtained. Dithiocarbamate vinylogs give the α-ethylenic ketene dithioacetals, with a carbonyl function in δ-position. Substituted dihydrothiophenes and thiazolines are prepared by the reaction of ethyl α-chloro-α-lithiopropionate with aminopropenethione and thioaroylformamidine respectively.

Co-vulcanizable rubber composition

Abstract: A rubber composition co-vulcanizable with a sulfur cure system, said composition comprising (1) 95 to 20% by weight of a partially hydrogenated unsaturated nitrile-conjugated diene copolymer rubber in which at least 50% of units derived from the conjugated diene are hydrogenated, (2) 5 to 80% by weight of an ethylenepropylene-nonconjugated diene terpolymer rubber, and (3) a required amount of at least one vulcanization accelerator selected from the group of thiuram accelerators and dithiocarbamate accelerators.

Titanium(IV) and Zirconium(IV) Dithiocarbamates

Abstract: Mono-, bis-, tris- and tetrakis-dithiocarbamato derivatives of titanium(IV) and zirconium(IV) tetrachlorides of the type M(S2CNRR1)n Cl4-n(n = 1–4, R = C2H5, R1 = C6H4CH3; R = H, R1 = C5H9 or C7H13) have been prepared in refluxing dichloromethane. These complexes have been characterized on the basis of elemental analyses, molecular weight determinations, conductance measurements, magnetic moment data, and spectral (i.r., electronic and proton magnetic resonance) studies. Dithiocarbamate ligands are bidentate in nature in these complexes. Five-, six-, seven- and eight-coordination numbers are reported for titanium(IV) and zirconium(IV) in their mono-, bis-, tris- and tetrakis-dithiocarbamato complexes, respectively.

Photoreaction of tris(ethylenediamine)cobalt(III) ion with bis(2-hydroxyethyl)dithiocarbamate ion.

Abstract: Complete ligand replacement of tris(ethylenediamine)cobalt(III)([Co(en)3]3+) by bis(2-hydroxyethyl)dithiocarbamate ion(htc−) forming [Co(htc)3] is induced by visible light in aqueous solution. The quantum yield of the reaction depends on the wavelength of the light and on the concentrations of the complex and the ligand. The distinct feature of this photo-induced substitution is that the quantum yield is higher than unity for the solution containing 0.02 mol dm−3 [Co(en)3]3+ and 0.13 mol dm−3 htc−. The unusually high quantum yield is explained on the basis of a primary photoredox process followed by a chain reaction involving cobalt(II) species as chain carriers. Cobalt(III) complexes of an N6 donor set such as [Co(NH3)6]3+, [Co(NH3)4(pn)]3+, [Co(chxn)3]3+, and [Co(dien)3]3+ also undergo similar photo-reaction, where pn, chxn, and dien denote 1,2-propanediamine, 1,2-cyclohexanediamine, and diethylenetriamine, respectively.

Dihiocarbamate Anions as Salts of Oxinate Chelates of Titanium(IV)

Abstract: (η5-Cyclopentadienyl) (η5-pyrrolyl)titanium(IV) dichloride, (η5-Sndenyl)(η5-pyrrolyl)titanium(IV)dichloride and (η5-cyclopentadienyl)(η5-indenyl)titanium(IV)dichloride, when treated with oxine in aqueous medium form ionic derivatives of the type [(η5-R)(η5-R′)TiL]+Cl− (R = C6H5, C9H7, R′ = C4H4N; R = C5H5, R′ = C9H9; L is the conjugate base of oxine). These react with dithiocarbamate anions in aqueous solution giving ionic complexes of the type (η5-R)(η5-R′)TiL]+X (X = Ne2NCS2 −, Et2NCS2 − and i-Pr2NCS2 −). IR and 1H NMR studies demonstrate that the ligand L is chelating in all the cases. Consequently, there is tetrahedral coordination about the titanium atom.

Syntheses and Characterisation of Some Metal Complexes of 4-Aminophenazone Dithiocarbamate

Abstract: Metal (Cr3+, Fe3+, Cu2+, Ni2+, Co2+, Vo2+, Mn2+, Zn2+, Hg2+, Tl+ complexes of 4-aminophenazone dithiocarbamate (4-Apdtc) have been prepared in aqueous alcoholic medium from stoichiometric amounts of the metal salt and 4-aminophenazone dithiocarbamic acid generated in situ. The complexes have been characterised on the basis of elemental analyses, molecular weights, magnetic moments, electronic and infrared spectra and thermogravimetric studies. Infrared studies suggest that 4-Apdtc acts as a bidentate ligand. The general composition of the complexes can be given as M(4-Apdtc)n (where n=oxidation state of metal).

Fungicidal composition for agricultural and horticultural purposes

Abstract: PURPOSE: The titled composition that contains a mixture of an N,N'-ethylenebis (dithiocarbamate)fungicide with a specific compound, as an active ingredient, thus permitting plant disease control over a wide range of fungi causing apple powdery mildew or the like with high synergistic effect. CONSTITUTION: The objective composition contains, as active ingredients, (E)-1- ( 2,4-dichlorophenyl )-4,4-dimethyl-2-( 1,2,4-triazol-1-yl )-1-penten-3-ol, which shows high controlling effect against powdery mildews and rusts, and at least one selected from N,N'-ethylenebis(dithiocarbamate) fungicides such as manganese ethylenebis(dithiocarbamate) or ethylenebis(dithiocarbamate) manganese, zinc complex, which shows high preventive effect against a variety of plant diseases caused by fungi in Phycomycetes such as Phytophthora rots and downy mildew to contribute to increase in crop production, at a weight ratio of 1/(0.5W20). COPYRIGHT: (C)1983,JPO&Japio

Differential pulse polarographic determination of nickel(II) as water-soluble dithiocarbamate

Abstract: A differential pulse polarographic determination of nickel(II) in the lower ppb region is possible by the addition of a dithiocarbamate, N-(dithiocarboxy)sarcosine, which forms water-soluble complexes with metal ions. An enhanced reduction current, due to adsorption of the complex, is obtained in an electrolysis solution composed of 0.1 M KCl and 0.015 M (NH4)2oxalate/0.02 M NaOH buffer in the presence of dithiocarbamate. The nickel(II) content in standard reference materials was accurately determined after separation of Fe(III) and Zn(II) by an anion-exchange technique. 0.89 and 1.36 (1.39) μg/g have been recovered from the certified values of 1.03 and 1.3 μg/g, respectively.

Acyl Complexes of Ni(II): Dialkyldithiocarbamate Derivatives

Abstract: The synthesis and spectroscopic properties of some new acyls of Ni(II) of formula Ni(COR)(S2 CNR′2)(PMe3) (R=Me3- SiCH2, Me2PhCCH2; R′=Me, Et, i-Pr) are described. Infrared and 1Hnmr studies show a square planar structure for the complexes with a bidentate dithiocarbamate ligand. The new acyls undergo dynamical behaviour in solution and participate in carbon monoxide exchange reactions with NiRCI(PMe3)2 complexes to give NiR-(S2CNR′2)(PMe3) and Ni(COR)CI(PMe3)2.

Lubricating oil composition containing a dialkyl dithiocarbamate-modified EPDM viscosity index improver

Abstract: The viscosity index and wear inhibiting properties of lubricating oil are improved by adding an effective amount of a 20,000-300,000 molecular weight olefin copolymer to which are grafted di-C 1-20 alkyl dithiocarbamate groups.

Dithiocarbamate, its preparation and injurious organism exterminatory agent consisting of said dithiocarbamate

Abstract: NEW MATERIAL:A compound of formulaI{X is aliphatic chain; p is 1 or 0; either one of Y and Y' is a group of formulaII[R1 and R2 are H, alkoxyl, phenyl, -COOR6 (R6 is metallic atom, ammonium, etc.), etc.; R3 and R4 are H, OH, alkyl, etc.; A is H, etc. which may be linked to either one of R3 and R4; l, m and n are 0 or 1; R and R' are cyano, -COOR6, etc.]; the other is aminoalkyl, etc.}. EXAMPLE:Sodium N-[ 1,2-di( sodium oxycarbonyl )ethyl ]ethylenebisdithiocarbamate. USE:An exterminatory agent against injurious organisms useful for agricultural and horticultural (germicides and acaricides) and industrial uses (molds in coating films or contamination by microorganisms). PROCESS:A compound of formula III (Rq is H or dithiocarbonic acid) is reacted with carbon disulfide in the presence of a free base, and the resultant product is then subjected to the double decomposition with a bi-or multivalent water-soluble metallic salt to afford the compound of formulaI.

Production of transparent thermoplastic resin composition

Abstract: PURPOSE:To form the tlted resin composition excellent in transparency, impact resistance and processability, by controlling the degree of grafting by addition of a specified dithiocarbamate in polymerizing an unsaturated monomer with a latex of a diene polymer constituting the trunk rubber. CONSTITUTION:There is used a dithiocarbamate represented by the formula, wherein R1 and R2 are each a 1-6C alkyl or aryl, and M is Na or K. Namely, 5-40wt% (calculated as solids) diene polymer latex, gel content 60-90wt%, average particle size 0.1-0.5mu, is graft-polymerized with 96-60wt% monomer mixture consisting of monomers selected from an aromatic vinyl monomer, methacrylate ester monomer and vinyl cyanide monomer and having a composition providing a refractive index of the graft polymer portion falling in the range of that of the above diene copolymer + or -0.01 in the presence of the above dithiocarbamate (here, the degree of grafting is 30-70wt%).