Results 71 to 80 of about 55,888 (222)
Lignin modification by epoxidation
BioResources, 2008 The chemical modification of lignin through hydroxymethylation and epoxidation is a way to develop new application fields and improvement of lignin performances. In this paper the influence of reaction conditions was studied using different samples of unmodified and modified lignins from annual plants (Wheat straw and Sarkanda grass).
Theodor Malutan +2 more
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Trichloroisocyanuric Acid: An Alternate Green Route for the Transformation of Alkenes into Epoxides
Journal of the Brazilian Chemical Society, 2002 The preparation of epoxides is efficiently achieved in mild conditions by reaction of alkenes with trichloroisocyanuric acid in aqueous acetone followed by treatment of the resulting chlorohydrin with aqueous KOH in ether / pentane.
Wengert Mira +2 more
doaj
Computationally Designed Zirconium Organometallic Catalyst for Direct Epoxidation of Alkenes without Allylic H Atoms: Aromatic Linkage Eliminates Formation of Inert Octahedral Complexes [PDF]
arXiv, 2015 We used density functional theory to computationally design a Zr organometallic catalyst for selectively oxidizing substrates using molecular oxygen as oxidant without coreductant. Each selective oxidation cycle involves four general steps: (a) a peroxo or weakly adsorbed O2 group releases an O atom to substrate to form substrate oxide and an oxo group,
arxiv
Molecules, 2016 Chiral epoxides—such as ethyl and methyl (S)-3-(oxiran-2-yl)propanoates ((S)-1a/1b)—are valuable precursors in many chemical syntheses. Until recently, these compounds were synthesized from glutamic acid in four steps (deamination, reduction, tosylation ...
Aurélien A. M. Peru +6 more
doaj +1 more source
Epoxidation of flavones by dimethyldioxirane
The Journal of Organic Chemistry, 1991 The synthesis of epoxides 2 by epoxydation of flavones 1 with isolated dimethyldioxirane (as acetone solution) at subambient temperatures is reported. These labile epoxides were isolated and completely characterized by UV, IR, 1 H and 13 C NMR, MS, and C, H analyses.
Adam, W. +3 more
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Česká Stomatologie a Praktické Zubní Lékařství, 2009 The objective was to compare efficacy of several types of halogen and LED polymerization lamps in curing restorative composite materials. Halogen lamps Heliolux DLX1 (Ivoclar Vivadent) and Megalux Fast Cure (MegaPhysik) and LED lamps DioPower (CMS Dental)
P. Bradna +3 more
doaj
Computational design for enantioselective CO2 capture: asymmetric frustrated Lewis pairs in epoxide transformations. [PDF]
Beilstein J Org ChemCarbon capture and utilisation (CCU) technologies offer a compelling strategy to mitigate rising atmospheric carbon dioxide levels. Despite extensive research on the CO2 insertion into epoxides to form cyclic carbonates, the stereochemical implications ...
Ferrer M +4 more
europepmc +2 more sources
Ozone adsorption on graphene: ab initio study and experimental validation [PDF]
arXiv, 2009 We have investigated ozone adsorption on graphene using the ab initio density functional theory method. Ozone molecules adsorb on graphene basal plane with binding energy of 0.25 eV, and the physisorbed molecule can chemically react with graphene to form an epoxide group and an oxygen molecule.
arxiv
Cross metathesis of unsaturated epoxides for the synthesis of polyfunctional building blocks
Beilstein Journal of Organic Chemistry, 2015 The cross metathesis of 1,2-epoxy-5-hexene (1) with methyl acrylate and acrylonitrile was investigated as an entry to the synthesis of polyfunctional compounds.
Meriem K. Abderrezak +6 more
doaj +1 more source
The Conversion of Aldrin and Heptachlor to Their Epoxides in Soil1 [PDF]
, 1958 Norman Gannon, J. H. Bigger
openalex +1 more source