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Bis tetrasulfide

According to the results of analyses, the reaction of piperylene with element sulfur proceeds under the following scheme yielding piperylene bis- tetrasulfide ... [Pg.54]

Figure 1. Dependence of wearing rate on applied loading 1. industrial oil of mark 52 - VNIINP-354 2. industrial oil of mark 52 - pipeiylene bis- tetrasulfide 3. industrial oil of mark 52 - sulfured oligopiperylene ... Figure 1. Dependence of wearing rate on applied loading 1. industrial oil of mark 52 - VNIINP-354 2. industrial oil of mark 52 - pipeiylene bis- tetrasulfide 3. industrial oil of mark 52 - sulfured oligopiperylene ...
Tests of an oil composition in the presence of synthesized piperylene bis- tetrasulfide were performed on twenty chisels of drills under the conditions of the Far North. [Pg.60]

Figure 2. Dependence of wearing rate on applied loading 1. a clay solution 2. a clay solution - SDBUR (1.0 mass.%) 3. a clay solution - SDBUR (1.0 mass.%) - piperylene bis- tetrasulfide (0.1 mass.%) 4. a clay solution - SDBUR (1.0 mass.%) - piperylene bis- tetrasulfide in solvent (0.1 mass.%). Figure 2. Dependence of wearing rate on applied loading 1. a clay solution 2. a clay solution - SDBUR (1.0 mass.%) 3. a clay solution - SDBUR (1.0 mass.%) - piperylene bis- tetrasulfide (0.1 mass.%) 4. a clay solution - SDBUR (1.0 mass.%) - piperylene bis- tetrasulfide in solvent (0.1 mass.%).
Synonyms Bis (pentamethylenethiuram) tetrasulfide Bis (N,N -pentamethylene) thiuram tetrasulfide Bis (piperidinothiocarbonyl) tetrasulfide DPTT Piperidine, 1,T-(tetrathiodicarbonothioyl)bis-Tetrasulfide, bis (pentamethylenethiuram) Tetrasulfide, bis (piperidinothiocarbonyl) Tetrone A... [Pg.1495]

While examining the strategies for the preparation of molybdenum dithiolene complexes as models for oxidoreductase enzymes, a series of potentially bioactive pentathiepino-pyrrolo[l,2-a]-pyrazine derivatives, 258, was discovered and reported (13CC4343). These pentathiepins fused with bis-heterocychc rings are the result of the reaction between alkynyl-substituted heterocycles 257 with elemental sulfur in the presence of molybdenum 0x0 bis-tetrasulfide. [Pg.561]

Poly sulfide Polymers. These polymers are made up of aliphatic hydrocarbon units connected by di-, tri- or tetrasulfide links. The synthetic rubber found useful in ordn has hydrocarbon units linked by either O or formal segments. The polymers are usually prepd by the condensation of a suitable organic dihalide, usually the chloride, with aq Na polysulfide. According to Ref 8, the most practical organic dichloride is dichlorodiethylformal viz, Bis[ 2[Pg.827]

Novel example of this reaction type are given by the copper-catalyzed decomposition of ethyl diazoacetate in the presence of bis(dialkoxyphosphoryl)disulfides 374 350 where P/S insertion sometimes accompanies the S/S insertion, and of bis(dialkoxy-thiophosphoryl)trisulfides 375 351 where desulfurization to give the disulfide derived product occurs during the reaction. Only P/S insertion product was obtained from bis(dialkoxyphosphoryl)trisulfide or -tetrasulfide 376 the copper-catalyst is dispensable in this case351K... [Pg.220]

Cyclic aromatic disulfides, polymerization reactions of, 23 706 Cyclic (arylene) disulfides, 23 712 Cyclic batch adsorption processes, 1-613 Cyclic bis(arylene tetrasulfide)s, 23 712 Cyclic carbon, polymer materials with, 15 177... [Pg.241]

The S5 also occurs in sulfur vapor (7, 24). It is not clear whether the vapor contains cyclopentasulfur or catenapentasulfur, or both. Schmidt 87) proposes that 85 can be prepared from bis-ir-cyclopentadienyl-molybdenum tetrasulfide by reaction with monosulfurdichloride ... [Pg.293]

The reaction temperatures and some of the activation energies cited above seem to be too low to support a radical-chain reaction mechanism. Guryanova found that exchange of radioactive elemental sulfur with the p sulfur atoms of bis-p-tolyl tetrasulfide proceeds at 80-130 °C with an activation energy of only 50 kJ/mol in the case of the corresponding trisulfide the activation energy was determined as 60 kJ/mol. These data sharply contrast with the observation that liquid sulfur has to be heated to more than 170 °C to detect free radicals by electron spin resonance spectroscopy and the activation energy for homolytic SS bond scission has been determined as 150 kJ/mol (see above). [Pg.172]

Tetraphosphorus decasulfide. pyridine complex, 4873 Tetraphosphorus hexanitride , 4775 Tetraphosphorus hexaoxide—bis(borane), 4862 Tetraphosphorus hexaoxide tetrasulfide, 4863 Tetraphosphorus tetraoxide trisulfide, 4853 Tetraphosphorus triselenide, 4874 Tetraphosphorus trisulfide, 4871... [Pg.2144]

Jaroniec and coworkers were able to incorporate (up to 30mol%) tris[3-(trimethoxysilyl)-propyl]isocyanurate (ICS) (18) into mesoporous silica phases by co-condensation with TEOS.179,180 They also tested multifunctional hybrid materials based on ICS as potential Hg2+ adsorbents by direct co-condensation of ternary mixtures comprising TEOS (70 to 88 mol%), ICS, and another organosilane, namely bis[3-(triethoxysilyl)propyl]tetrasulfide, A-(3-triethoxysilylpropyl)-4,5-dihydroimi-dazole, or ureidopropyltrimethoxysilane.181 Ternary systems comprising TEOS, ICS, and MPTES, which showed a high adsorption capacity for Hg2+, were also reported (for PMOs based on ICS, see Section 3.4.3).182... [Pg.68]

Lewis et al. (1960) report that cystine is degraded during the acid hydrolysis of wool with the appearance of seven new sulfur-containing compounds, one of which is cysteine. These compounds produce color in the Shinohara reagent, although the color yield differs from that of cystine. Fletcher and Robson (1962a, 1963) have isolated another of these compounds and identified it as bis(/3-amino-/3-carboxyethyl)trisulfide. There was evidence also for the presence of the corresponding tetrasulfide. [Pg.230]

BIS(ii -METHYLCYCLOPENTADIENYL)TITANlUM PENTASULFIDE, BIS(n -METHYLCYCLOPENTADIENYL)-DIVANADIUM PENTASULFIDE/ AND BIS(i -METHYLCYCLOPENTADIENYL)DIVANADIUM TETRASULFIDE ... [Pg.51]

Several cyclic bis(arylene tetrasulfides) have been synthesized within the last few years. These ring compounds can be polymerized thermally in much the same way as sulfur itself. However, whereas polymeric sulfur depolymerizes on standing at room temperature, the poly(arylene polysulfides) considered here are stable polymers under ordinary conditions. The mechanism by which the cyclic bis-(arylene tetrasulfides) polymerize has been established by ESR as a free-radical process. The maximum number-average molecular weights are from 15,000 to 16,000. [Pg.103]

The work described here deals with a new approach to preparing poly(arylene polysulfide). This approach involves a free-radical mechanism—namely, the thermal polymerization of cyclic bis(arylene tetrasulfides ) ... [Pg.104]

These cyclic bis(arylene tetrasulfides) were originally synthesized by Z. S. Ariyan and R. L. Martin (13, 14, 15) by the reaction of the appropriate aromatic moiety with sulfur monochloride in the presence of a mineral acid-clay catalyst. [Pg.105]

Figure 19.3 Sulfurization reagents for the synthesis of oligonucleotide phosphorothioates bis(phenylacetyl) disulfide (13), tetraethylthiuram disulfide (14), dibenzoyl tetrasulfide (15), bis(0,0-diisopropoxyphosphinothioyl) disulfide (16),... Figure 19.3 Sulfurization reagents for the synthesis of oligonucleotide phosphorothioates bis(phenylacetyl) disulfide (13), tetraethylthiuram disulfide (14), dibenzoyl tetrasulfide (15), bis(0,0-diisopropoxyphosphinothioyl) disulfide (16),...
Chloro-4,6-bis(methylsulfanyl)-l,3,5-triazine (15) on reaction with disodium tetrasulfide forms a bidentate bistriazine molecule 16 which is linked by a sulfane chain.103 This type of compound exhibits excellent rubber-vulcanization properties. [Pg.758]


See other pages where Bis tetrasulfide is mentioned: [Pg.116]    [Pg.576]    [Pg.37]    [Pg.992]    [Pg.116]    [Pg.379]    [Pg.604]    [Pg.5674]    [Pg.992]    [Pg.828]    [Pg.441]    [Pg.55]    [Pg.162]    [Pg.103]    [Pg.104]    [Pg.106]    [Pg.108]    [Pg.110]    [Pg.112]    [Pg.114]    [Pg.758]   
See also in sourсe #XX -- [ Pg.215 ]




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