Global ETD Search
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Showing 1 to 20 of 21 for “"Mercaptan"”.
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Flavin-dependent Enzymes in Natural Product Biosynthesis
… SAC, and instead was highly active with allyl mercaptan and NADPH. This contradicted the initial proposal and suggested that AsFMO is involved in an alternative path producing allicin directly from allyl mercaptan. FzmM was identified to perform multiple N-oxidations which lead to the formation …
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The reduction of organic compounds of sulfur by metals in liquid ammonia
… removal and determination of hydrogen sulfide in mercaptans was developed. 6. A new synthesis for allyl mercaptan was found. 7. The formation of a resin believed to be a thiophene polymer of the formula (C₄H₄S)<sub>x</sub> is reported.
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Measuring and Developing a Control Strategy for Odorous Gases from Solids Handling Processes of a Large Wastewater Treatment Plant
… factors controlling odor production. Methyl mercaptan and dimethyl sulfide showed highest odor indexes meaning higher human perception. A correlation was found between ORP and sulfides. The DAF thickened sludge and the blended sludge had the highest odor indexes and the lowest ORP's measured.
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Chemically modified polymeric resins for high performance liquid chromatography, solid-phase extraction and organic separation by LC and GC
… which was used as a selective abstractor of mercaptan compounds in the split liner of capillary GC. Non-mercaptan (both sulfur and non-sulfur) compounds can pass the liner and be quantitatively determined well. The injection temperature was also studied.</p>
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The Chemical and Mechanical Properties of Thiol Modified ABS
… group, notably 3,5-di-tert-butyl-4-hydroxybenzyl mercaptan (BHBM), an antioxidant, and 4-benzoyl-3-hydroxyphenyl-1-O-ethyl thioglycollate (EBHPT), a UV stabiliser, have been bound to ABS in latex and during processing in a high temperature mixing operation through the thiol group by free radical …
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Reactions of Hindered Phenols with Unsaturated Hydrocarbons in the Presence of Free Radicals
… (TBC) and 3,5-ditert-butyl-4-hydroxy-benzyl mercaptan (BHEM) with rubber has been investigated and the percentage of antioxidant bound under optimum conditions has been determined. The byproducts formed during the adduct formation and their effect on the binding reaction was also studied. The …
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Synthesis and Evaluation of Bound Thiol Antioxidants
… (MADPA) and 3,5-di-tert-butyl-4-hydroxybenzyl mercaptan (BHBM) with natural and styrene-butadiene rubbers have also been investigated by a mechanochemical process in a torque rheometer. Masterbatch concentrates containing high levels of bound antioxidants in natural and styrene-butadiene …
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A Study of Thiol Based Bound Antioxidants in Acrylonitrile-Butadiene Rubbers
… 3,5-di-tertiary-buty1-4-hydroxybenzyl mercaptan (BHBM), 4-anilinophenylthioglycollamide (PAPT) and 4-anilinophenylthiopropionamide (PPPT) have been successfully bound to acrylonitrile-butadiene rubber (NBR) by a free radical process in the latex and during processing. Under optimum …
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High Molecular Weight and Polymer-Bound Antioxidants
… grafting of 3, 5-di-tert—butyl—4—hydroxy—benzyl mercaptan to polypropylene films was investigated and its application as a polymeric antioxidant masterbatch for virgin polypropylene was also carried out.
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Development of Epipolythiodiketopiperazine syntheses and the total synthesis of diketopiperazine alkaloids
… hydroxytryptophan amino acid synthesis and a new mercaptan reagent for the epipolythiodiketopiperazine (ETP) synthesis that can be unraveled under very mild conditions. The development of this new reagent was accomplished after exploring the acid promoted incorporation of different alkyl thiols …
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Sensorial characteristics of odour active compounds from raw natural rubber
… identified within rubber emissions were methyl mercaptan, dimethyl sulfide, dimethyl disulfide, and dimethyl trisulfide. Due to their low Odour Threshold Value (OTV), all identified VSCs potentially contribute to the overall sensorial profile of the rubber odour. While Volatile Organic Compounds …
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Detectability of biosignature gases in the atmospheres of terrestrial exoplanets
… sulfide, dimethyl sulfoxide, ethanol, ethyl mercaptan, fluoroacetone, isoprene, methyl ethyl ketone, methyl mercaptan, methyl vinyl ketone, thioglycol, and toluene. To circumvent the nonmapability of the absorption cross sections to dierent temperatures and pressures, I use the detectivity …
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Total synthesis of cyclotryptamine and diketopiperazine alkaloids
… reaction of a silyl-tethered indole, and a new mercaptan reagent for epipolythiodiketopiperazine (ETP) synthesis that can be unravelled under very mild conditions. In evaluating the impact of Cl 2-hydroxylation, we have identified a unique need for an intramolecular variant of our Friedel-Crafts …
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Volatile organic compounds in seawater
… within the water from precursors such as methyl mercaptan or other known polysulfide metabolites. Total volatile concentrations in Vineyard Sound seawater varied between 2OO and 500 ng/kg for the period from January to June. Maximum concentrations occurred during the late-winter phytoplankton …
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Spectroscopic and electrochemical investigation of phenyl, phenoxy, and hydroxyphenyl-terminated alkanethiol monolayers
… (4), 12-phenyldodecyl-mercaptan (5), 12-phenylundecyoxymercaptan (6), 4-(6-mercapto-hexyl)phenol (7), and 4-(12-mercaptododecyloxy)phenol (8) were synthesized. The thiol products were characterized by NMR, HRMS, and elemental analysis. Self-assembled monolayers (SAMs) on …
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Rational design of hydrogen-free catalytic active sites
Materials that are organic-based and exhibit oxidative catalytic activity, including free-radical pathways, while being refractory to the activated oxygen species are not known. The synthesis of several classes of such materials, their electronic and structural characterizations as well as …
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