Results 31 to 40 of about 68,150 (262)

Synthesis, Chemistry and Applications of 5-Hydroxymethyl-furfural And Its Derivatives [PDF]

open access: yes, 2001
The prospect of exciting research activity in the chemistry of furfural derived compounds such as 5-hydroxymethylfurfural (HMF), 2,5-furandicarbaldehyde and 2,5-furan-dicarboxylic acid prompted the writing of this article.
Lewkowski, Jarosław
core   +1 more source

Heterogeneous acidic catalysts for the tetrahydropyranylation of alcohols and phenols in green ethereal solvents

open access: yesBeilstein Journal of Organic Chemistry, 2018
The application of heterogeneous catalysis and green solvents to the set up of widely employed reactions is a challenge in contemporary organic chemistry. We applied such an approach to the synthesis and further conversion of tetrahydropyranyl ethers, an
Ugo Azzena   +4 more
doaj   +1 more source

Final Report on the Safety Assessment of PPG-2 Methyl Ether, PPG-3 Methyl Ether, and PPG-2 Methyl Ether Acetate [PDF]

open access: yesInternational Journal of Toxicology, 2009
PPG-2 methyl ether, PPG-3 methyl ether, and PPG-2 methyl ether acetate are used in cosmetics as fragrance ingredients and/or solvents at concentrations of 0.4% to 2%. Propylene glycol ethers are rapidly absorbed and distributed throughout the body when introduced by inhalation or oral exposure, but the inhalation toxicity of PPG-2 methyl ether vapor ...
James G. Marks   +8 more
openaire   +3 more sources

Nickel-Mediated Hydrogenolysis of C–O Bonds of Aryl Ethers: What Is the Source of the Hydrogen? [PDF]

open access: yes, 2012
Mechanistic studies of the hydrogenolysis of aryl ethers by nickel were undertaken with (diphosphine)aryl methyl ethers. A Ni(0) complex containing Ni–arene interactions adjacent to the aryl–O bond was isolated.
Agapie, Theodor   +4 more
core   +3 more sources

High-performance liquid chromatographic separation of surface flavonoid aglycones in Artemistia annua L. and Artemisia vulgaris L [PDF]

open access: yesJournal of the Serbian Chemical Society, 2004
External flavonoid aglycones from Artemisia annua L. and Artemisia vulgaris L. were analyzed by the HPLC method. The mobile phase was composed of t-butanol-methanol- 20 mmol l-1 phosphate buffer, pH 3.22.
Nikolova Milena   +2 more
doaj   +1 more source

How nucleophilic are silyl enol ethers? Kinetics of the reactions of electron rich CC-double bonded systems with carbenium ions [PDF]

open access: yes, 1993
Rate constants for the reactions of the bis(p-dimethylaminophenyl)carbenium ion 1 with silyl enol ethers, allyl silanes, and allyl stannanes show the reactivity order H2C=CR-CH2SiMe3 < H2C=CR-OSiMe3 < H2C=CR ...
Mayr, Herbert, Patz, Matthias
core   +1 more source

New [4 + 2] Cycloadditions of in situ Generated Indolyl Enol Ethers and Their Anions with Dimethyl Acetylenedicarboxylate: A One-Pot Access to 4-Alkoxy-Substituted Carbazoles

open access: yesCHIMIA, 1992
The 3-indolyl(methyl)methoxycarbenium tetrafluoroborates 1a?d were deprotonated with NaH to furnish in situ the highly reactive 3-indolyl enol ethers 2a or their corresponding 3-indolyl enol ether anions 2b.
Ulf Pindur, Martina Rogge
doaj   +2 more sources

Factors Dictating Carbene Formation at (PNP)Ir [PDF]

open access: yes, 2010
The mechanistic subtleties involved with the interaction of an amido/bis(phosphine)-supported (PNP)Ir fragment with a series of linear and cyclic ethers have been investigated using density functional theory.
Ariafard, Alireza   +5 more
core   +1 more source

Methyl and Ethyl Ethers of Glycerol as Potential Green Low-Melting Technical Fluids

open access: yesMolecules, 2023
The study is dedicated to the consideration of lower alkyl ethers of glycerol as potential components of low-melting technical fluids (e.g., heat transfer fluids, hydraulic fluids, aircraft de-icing fluids, etc.).
Vadim Samoilov   +7 more
doaj   +1 more source

Lacinilene C 7-methyl ether [PDF]

open access: yesActa Crystallographica Section E Structure Reports Online, 2013
The title compound, C16H20O3 [systematic name: 1-hy-droxy-7-meth-oxy-1,6-dimethyl-4-(propan-2-yl)naphthalen-2(1H)-one], is a sesquiterpene isolated from foliar tissues of the cotton plant and is of inter-est with respect to its anti-bacterial properties.
Bakhtiyar T. Ibragimov   +4 more
openaire   +4 more sources

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