4,4 -thiobis preparation

The samples investigated initially were commercial high pressure low density, linear low density and high density polyethylenes and had properties given in Table 1. Solutions of these polymers were prepared in concentrations of 0.8 to 3.5 g/1 by dissolving the pol5rmer over a time period of two hours in an oven maintained at 145°C. To avoid degradation 0.05% 4,4 -thiobis(3-methyl-6-tert-butyl phenol) was used as an antioxidant in the solutions. 

Tris (f-butyl) phenoxy-, 4,4 -methylenebis (2,4- di-f-butyl) phenoxy- or 4,4 -thiobis (2-t-b utyl-6-methyl) phenoxy-radicals have been prepared for ESR observation by oxidation of the corresponding phenolates at a graphite electrode in acetonitrile 561). Dimroth etaL S62 determined reversible le -oxidation potentials for a series of substituted phenols in basic medium. (CF3)2NOH has been oxidized in alkaline medium on platinum or magnetite in quantitative yield to the pink violet hexafluorodimethylnitroxide (CF3)2NO 563 ... 

Oxidative coupling was used for the synthesis of some stabilizers having properties of AO or FR. Products of oxidation of 4,4 -isopropylidenebis(2-methyl-6-tert-butylphenol with pota ium ferricyanide [151] or of 4,4 -thiobis(2-rcr/-butyl-5-methylphenol) with oxygen in the presence of copper salts [152] (118) were tested as AO. Thermostable fireproofing additives containing 1 to 4 bromine atoms on a phenolic moiety and designed for the stabilization of thermoplastics, e.g. 119, were prepared by oxidative coupling of brominated phenols [153]. 

The dimethyl binuclear titanium compounds [TiMe(/x-OR)(ft3-tbop)]2 (R = Me, Et) tbop = 2,2 -thiobis[4-(l,l,3,3-tetramethylbutyl)phenoxo] are prepared by reaction of the alkoxo complexes[Ti(OR)(/x-OR)(ft3-tbop)]2... 

Allyl Sulfide. 3,3 -Thiobis-l-propene diallyl sulfide thioallyl ether "oil garlic" C4H1QS mol wt 114.20. C 63.10%, H 8.83%, S 28.08%. (CHJ=CHCH )jS. Prepared from allyl bromide and sulfur in soln of Na in liquid NH7 Brandsma, Wijers, Rec. Trav. Chim. 82, 68 (1963),... 

For catalysis, 0.2 mol % of the [Cu Cl(2,2 -thiobis(2,4-di- cr -butylphenol)) (NEt3)2] catalyst prepared in situ from copper(I) chloride, LH2, and triethyl-amine at 50°C in THF, was used to oxidize several alcohols at room temperature in air. The most important results are summarized in Table V. 

Treatment of the enone (69) with an excess of the diene (70) in the presence of aluminium trichloride and 4,4-thiobis-(6-t-butyl-3-methylphenol) gave the tricyclic ketone (71) (40%) as the sole Diels-Alder product. Reduction then afforded the lactone (72) whose constitution and stereochemistry were established by X-ray analysis. Finally, demethylation gave the racemic alcohol (73) which differs from the quassin skeleton only in the stereochemistry at C-9. The Diels-Alder reaction also plays a key role in two other de novo syntheses. The ring A seco-derivative (75) has been prepared from the adduct (74), and the ring A nor-compound (77), a possible intermediate for the synthesis of quassimarin (78), has been obtained from the Diels-Alder product (76). ... 

Poly1(1,1,1-trifluoro-2,4-pentanedionato-0,0 )chroniun(111)-u-[3,3 -thiobis(2,4-pentanedionato-0,0 )), [Cr(tfa)(acac2S)]g.—The synthesis of this polymer has been based on the reaction of Cr(tfa)(acac)2, which was prepared by the method of Palmer, Fay and Piper (21) with SCI2 (exact 1 1... 

When atriazine unit is a component of a PPS copolymer, a highly refractive and transparent compound emerges [73]. The polymer can be prepared by a polycondensation reaction from 4,4 -thiobis(benzenethiol) and 2,4-dichloro-6-methylthio-1,3,5-triazine. 

THF n. Abbreviation for tetrahydrofiiran. CAS registry number 109-99-9. Additional names Diethylene oxide tetramethylene oxide. Molecular formula C4H8O. Molecular weight 72.11. Percent composition C 66.62%, H 11.18%, and O 22.19%, Literature references Preparation from 1,4-buta-nediol Schmoyer, Case, Nature 187, 592 (1960). Manufactured by catalytic hydrogenation of maleic anhydride Gilbert, Howk, USA 2772293 (1956 to Du Pont) of furan Banford, Manes, USA 2846449 (1958 to Du Pont) Manly, USA 3021342 (1962 to Quaker Oats). Stabilization to prevent excessive peroxide formation on storage with 0.05-1.0% p-cresol, 0.05-0.1% hydroquinone, or less than 0.01-0.1% 4,4-thiobis(6- tert-butyl- m-cresol) ... 

In the case of thirteen LDPEs used in order to study the memory effects, the samples with various shearing histories were prepared hy changing shear working time. The shear working was performed with a Brahender plasticorder equipped with No. 5 rotor at 50 rpm rotor speed. Prior to the shearing with the Brahender, 2000 ppm of if,ii -thiobis (3 methyl-6-tert-butylphenol) was added to the materials in order to prevent them from thermal oxidation. 

Under 505-60-2, you see the chemical name "l,l-Thiobis[2-chloroethane], TO-03220." The DOC is organized alphabetically by preferred chemical name, which in this case is not the trivial name "mustard gas." The entry TO-03220 is found in Volume 6. As in the Merck Index, DOC entries usually provide synonyms, basic chemical and physical data, and literature references to background information on preparation, toxicology, spectra, etc. (In the case of mustard gas, however, note that the DOC does not refer to Meyer s original synthesis.)... 

McBride and Evans [10] developed a rapid voltametric method for the estimation of antioxidants and tocopherols in oils and fats. The sample solutions were prepared by dissolving the oil or lard sample in an appropriate solvent, e.g., in most cases 0.12 M sulfuric acid in ethanol - benzene (2 1). The solutions were analysed with use of a linearly varying potential and a stationary, planar vitreous-carbon electrode, with a standard calomel electrode and a platinum-wire counter-electrode. Separate peaks were obtained for a-, y- and 8-tocopherol the peak for the P-isomer, was superimposed on that for the y-tocopherol. BHA (>10 ppm) can be determined in vegetable oil under the same conditions, provided that 8-tocopherol is absent. Kohler and co-workers [11] described a polarographic method for the determination of 4-4 thiobis(BHT) in food. The antioxidant was first nitrated, preferably with fuming nitric acid - concentrated sulfuric acid (1 1) at 20 °C for 1 hour. The polarography was carried out on the resulting solution after dilution and addition of urea and sodium acetate buffer solution. The Ey for the nitrated compound was -0.54 V versus the... 

Thianthrene-2,7- and -2,8-dicarboxylic adds plus a synthetic intermediate, 4,4 -thiobis[3-chlorobenzoic acid], were converted to new aromatic polyamides having inherent viscosities of 1.29 to 2.39 dL/g by direct polycondensation with 4,4-oxydianiline and 1,4-phenylenediamine in N-methyl-2-pynolidinone using triphenyl phosphite and pyridine. Thianthrene-based polyamides were more soluble than analogous poly(tluoether amide)s. Polymer films were cast from either DMF or DMAc/LiCl solutions and analyzed by FTIR and NMR. All prepared aramids displayed good thermal stability by DSC and TGA. 

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