Results 51 to 60 of about 62,467 (179)
[2+2+2] Cycloaddition Reactions of Macrocyclic Systems Catalyzed by Transition Metals. A Review
Molecules, 2010 Polyalkyne and enediyne azamacrocycles are prepared from arenesulfonamides and various alkyne and alkene derivatives either under basic or neutral conditions.
Anna Roglans, Anna Pla-Quintana
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Hydrocarbons and polychlorinated biphenyls from the unsaponifiable fraction of anhydrous milk fat
Journal of Lipid Research, 1973 Using a combination of gas–liquid chromatography and mass spectrometry, the presence of 39 aliphatic hydrocarbons was firmly established in the unsaponifiable fraction of anhydrous milk fat.
Vincent P. Flanagan, Aldo Ferretti
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Beilstein Journal of Organic Chemistry, 2015 In the hydrogenation of sluggish unactivated enamine substrates, Rh complexes of electron-deficient phosphines are demonstrated to be far more reactive catalysts than those derived from triphenylphosphine.
Sergey Tin +2 more
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High Ethylene and Propylene in an Area Dominated by Oil Production
Atmosphere, 2020 We measured the spatial distribution and composition of ozone-forming hydrocarbons, alcohols, and carbonyls in Utah’s Uinta Basin during the winter months of 2019 and 2020. The Uinta Basin contains about 10,000 producing oil and gas wells. Snow cover and
Seth N. Lyman +4 more
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Visible-light photoredox catalysis enabled bromination of phenols and alkenes
Beilstein Journal of Organic Chemistry, 2014 A mild and efficient methodology for the bromination of phenols and alkenes has been developed utilizing visible light-induced photoredox catalysis. The bromine was generated in situ from the oxidation of Br− by Ru(bpy)33+, both of which resulted from ...
Yating Zhao +4 more
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Rewriting Alkene Frameworks: A Practical Strategy for Nitrogen Incorporation
ChemistryEuropeExpanding the reach of skeletal editing to unactivated hydrocarbons presents a formidable challenge in nitrogen incorporation chemistry. In a recent advance, Morandi and coworkers have developed a direct, metal‐free strategy to insert nitrogen into ...
Ranjini Laskar, Frank Glorius
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Palladium-catalyzed Heck-type reaction of secondary trifluoromethylated alkyl bromides
Beilstein Journal of Organic Chemistry, 2017 An efficient palladium-catalyzed Heck-type reaction of secondary trifluoromethylated alkyl bromides has been developed. The reaction proceeds under mild reaction conditions with high efficiency and excellent functional group tolerance, even towards ...
Tao Fan, Wei-Dong Meng, Xingang Zhang
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Room Temperature Ni(II) Catalyzed Hydrophosphination and Cyclotrimerization of Alkynes
Inorganics, 2018 The catalytic activity of nickel complexes in hydrophosphination involving secondary phosphines is not a commonly studied transformation. Beyond a small number of stand-out examples, many reports in the literature focus on the use of simple nickel salts.
Ruth L. Webster
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Frontiers in Plant ScienceCuticular waxes are a mixture of hydrophobic components protecting plant tissues from the environment. Populus trichocarpa and P. balsamifera are closely-related tree species with broad North American distribution; however, variation in their cuticular ...
Mahbobeh Zamani-Babgohari +11 more
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Lipase-mediated epoxidation of alkenes in supercritical carbon dioxide
Green Chemistry Letters and Reviews, 2018 In this work, supercritical carbon dioxide was used as reaction media in the lipase-mediated epoxidation of alkenes for the first time. Under the optimal conditions (alkene (1 mmol), novozym 435 (15 mg), H2O2 (50% aqueous solution, 1.4 mmol), n-caprylic ...
Jiaxin Zhang +7 more
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