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Showing 1 to 14 of 14 for “"Oxirane"”.
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Thermochemistry of fluorinated aldehydes and corresponding radicals;thermochemistry and kinetics of diethyl ether and ethyl oxirane relative to reactions under atmospheric and combustion conditions
Fundamental thermochemical properties including enthalpies ([Delta]H_{f 298}), entropies (S(T)), heat capacities (Cp(T)), and bond dissociation energies (BDEs) for several common and complex hydrocarbon fuel species are determined using computational chemical methods. [Delta]H f 298 values are …
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Reactions of a super-electron donor with diarylcyclopropanes and epoxides
… cis- and trans-isomers of 2,3-bis(4-fluorophenyl)oxirane, 2,3-bis(4-chlorophenyl)oxirane and 2,3-diphenyloxirane was achieved by the DMAP-derived electron donor 1.57 (Scheme 1). In each case, only the trans-alkene product was isolated. The reaction conditions depend on the energy level of the LUMO …
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Field and Laboratory Evaluations of the Herbicidal Efficacy, Uptake and Translocation of Tridiphane and Its Effects on Atrazine Uptake, Translocation and Metabolism
… {2-(3,5-dichlorophenyl)-2-(2,2,2-trichloroethyl)oxirane} as a postemergent herbicide with atrazine {2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine} and cyanazine {2-((4-chloro-6-(ethylamino)-s-triazin-2-yl)amino)-2-methylpropionitrile} for annual grass control in corn (Zea mays L.). In …
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Synthese, Charakterisierung und thermischer Abbau von Copolymeren aus THF und funktionalisierten Oxiranen
… copolymers of thf and differently substituted oxiranes were prepared via kationic ring-opening copolymerization. Oxirane comonomers used were ethylene oxide, propylene oxide, alkylglycidyl ethers, alkyl 3,4-epoxybutanoate and glycidyl acetate. Copolymers with different ranges of composition and …
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Probing the dynamical response of organic molecules to intense laser pulses
… Our final set of results looks at methyl oxirane (a chiral molecule). We investigate the difference in the response of the enantiomers to left- and right-circularly polarized light.
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Enantiodivergent chemoenzymatic synthesis of codeine
… nucleophilic opening of a homochiral vinyl oxirane, which led to a total synthesis of the natural isomer of codeine, is detailed. Furthermore, described herein are novel methodologies designed for the transformation of naturally occurring opiates into medicinally relevant derivatives. Two …
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Development of Biolubricants from Vegetable Oils for Non-Internal Combustion Engine Applications
… catalyst. The conversion, selectivity, oxirane oxygen content (OOC), and iodine value of the final epoxidized canola oil trimethylolpropane (ECOTMP) ester was 95.2%, 98.62%, 4.12%, and 3.4 mg I2/g, respectively. This work has focused on the conversion of vegetable oils to saturated …
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DESIGN AND SYNTHESIS OF ALPHA-AMINO ACID AND MORPHOLINO `CHIMERA' BUILDING-BLOCKS
… morpholines by the double and consecutive oxirane ring-opening under SL-PTC, followed by regioselective conversion of only one hydroxy group into a leaving group. Our background in the synthesis of 2,6-disobstituted morpholines, made us focus our attention on improving a chemical synthesis …
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Synthetic Efforts Toward Hypoestoxide, Platensimycin, And Guttiferone G
… of this molecule relied on a novel vinyl oxirane ring expansion to access the oxa-bicyclic moiety and an alkylative dearomatization to complete the carbocyclic core. Guttiferone G belongs to the family of [3.3.1] bicyclic polyprenylated phloroglucinol derived natural products, which have …
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Synthesis of environmentally-friendly polyurethane dispersions based on soybean oil- derived polyols and their applications in advanced water-based and uv-cure coatings
… ester (ESFAME). The cationic ring opening of oxirane oxygen groups from ESFAME resulted in polyol with average hydroxyl number 88 mgKOH/g and number average molecular weight 1517.</p> <p>The indigenous soy-polyol was used as soft segment polymeric chain backbone of aqueous PUD. The PUDs with …
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Applications Of Electronic Structure Theory To Problems In Unimolecular Dissociation And Inorganic And Biochemical Systems
… gelatinase by the (S)-SB-3CT enantiomer and its oxirane analogue is examined computationally by QM/MM method, and compared to the mechanism of (R)-SB-3CT.</p>
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Studies on the mechanisms of action of the herbicide safener CGA- 92194
… [2-(3,5-dichlorophenyl)-2-(2,2,2-trichloroethy1)- oxirane] a potent inhibitor of plant GSH-<u>S</u>-transference enzymes, These results indicate that a safener-induced stimulation of the spontaneous or enzymatic conjugation of metolachlor with GSH is most likely involved in the protective action of …
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Hyperbranched polyesters for polyurethane coatings: their preparation, structure and crosslinking with polyisocyanates
… OH of BHPPA with a suitable reagent like oxirane, which would lead to groups like O-CH2-CH2-OH in the place of the phenolic OH. Such a BHPPA modification should in turn yield modified “poly-BHPPA” polycondensates, which would combine the advantages of poly-BHPPA with those of aliphatic OH …