Results 21 to 30 of about 96,389 (286)

Extraordinarily large kinetic isotope effect on alkene hydrogenation over Rh-based intermetallic compounds

open access: yesScience and Technology of Advanced Materials, 2019
A series of Rh-based intermetallic compounds supported on silica was prepared and tested in alkene hydrogenation at room temperature. H2 and D2 were used as the hydrogen sources and the kinetic isotope effect (KIE) in hydrogenation was studied.
Shinya Furukawa   +3 more
doaj   +1 more source

Alkyne–Alkene [2 + 2] cycloaddition based on visible light photocatalysis

open access: yesNature Communications, 2020
UV-activated alkyne–alkene [2 + 2] cycloaddition has served as an important tool to access cyclobutenes. Although broadly adopted, the limitations with UV light as an energy source prompted us to explore an alternative method.
Sujin Ha   +6 more
semanticscholar   +1 more source

Photoinduced Electron-transfer Reaction of Pentafluoroiodobenzene with Alkenes

open access: yesMolecules, 1997
Irradiation of pentafluoroiodobenzene and alkenes gave the corresponding adducts. The presence of single electron-transfer scavengers, (p-dinitrobenzene and t-Bu2NO) and the free radical inhibitor (hydroquinone) suppressed the reaction.
Qing-Yun Chen, Zheng-Yu Long, Ping Cao
doaj   +1 more source

Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures

open access: yesFrontiers in Microbiology, 2021
The ability to produce medium chain length aliphatic hydrocarbons is strictly conserved in all photosynthetic cyanobacteria, but the molecular function and biological significance of these compounds still remain poorly understood.
Eerika Vuorio   +7 more
doaj   +1 more source

Recent developments in gold-catalyzed cycloaddition reactions

open access: yesBeilstein Journal of Organic Chemistry, 2011
In the last years there have been extraordinary advances in the development of gold-catalyzed cycloaddition processes. In this review we will summarize some of the most remarkable examples, and present the mechanistic rational underlying the ...
Fernando López, José L. Mascareñas
doaj   +1 more source

Impacts of Nutrients on Alkene Biodegradation Rates and Microbial Community Composition in Enriched Consortia from Natural Inocula

open access: yesMicrobiology Spectrum, 2023
There is a growing need for biological and chemical methods for upcycling plastic waste streams. Pyrolysis processes can accelerate plastic depolymerization by breaking polyethylene into smaller alkene components which may be more biodegradable than the ...
Emily Byrne   +3 more
doaj   +1 more source

Nickel-catalysed enantioselective alkene dicarbofunctionalization enabled by photochemical aliphatic C–H bond activation

open access: yesNature Catalysis
The development of novel strategies to rapidly construct complex chiral molecules from readily available feedstocks is a long-term pursuit in the chemistry community.
Xia Hu   +4 more
semanticscholar   +1 more source

Arylsulfonylacetamides as bifunctional reagents for alkene aminoarylation

open access: yesScience, 2018
Arenes and amides from a single source Pharmaceutical synthesis often requires the formation of adjacent carbon-carbon and carbon-nitrogen bonds. Monos et al.
Timothy M Monos   +2 more
semanticscholar   +1 more source

Alkene Isomerization through Allylmetals as a Strategic Tool in Stereoselective Synthesis

open access: yes, 2020
The positional isomerization of alkenes is a well-known process mediated by various transition metal complexes.
Itai Massad, I. Marek
semanticscholar   +1 more source

Cyclization–endoperoxidation cascade reactions of dienes mediated by a pyrylium photoredox catalyst

open access: yesBeilstein Journal of Organic Chemistry, 2014
Triarylpyrylium salts were employed as single electron photooxidants to catalyze a cyclization–endoperoxidation cascade of dienes. The transformation is presumed to proceed via the intermediacy of diene cation radicals.
Nathan J. Gesmundo, David A. Nicewicz
doaj   +1 more source

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