Results 171 to 180 of about 3,012,109 (369)

Enrichment of Light Isotopes of Sulphur, Carbon and Oxygen, Using an Anion Exchanger. [PDF]

, 1962
Karl Erik Holmberg, Birgitta Hansson, Richard Dahlbom, Jan Sjövall, Olof Theander, H. Flood   +5 more
openalex   +1 more source

Visible‐Light‐Promoted Dearomatization for The Construction of Imidazole Scaffolds

Advanced Synthesis &Catalysis, EarlyView.
Lighting up flat aromatics: a visible‐light photocatalytic dearomative acylation of imidazo[1,2‐a]pyridines using α‐keto acids as sustainable acyl radical precursors is reported, leading to dual fluorescent imidazoles. Dearomatization is a powerful strategy for constructing complex carbocycles and heterocycles, though it typically relies on harsh ...
Silvia Roscales, Aurelio G. Csáky
wiley   +1 more source

Paired analysis of tree ring width and carbon isotopes indicates when controls on tropical tree growth change from light to water limitations. [PDF]

Tree Physiol, 2022
Brienen R, Helle G, Pons T, Boom A, Gloor M, Groenendijk P, Clerici S, Leng M, Jones C.   +8 more
europepmc   +1 more source

Carbon and Oxygen Isotope Ratios as Environmental Indicators: Anomalous Results from Carbonate Shells from Beach Sediments of Lake Managua, Nicaragua [PDF]

, 1964
Jon N. Weber
openalex   +1 more source

One‐Pot Cascade Synthesis of Isoquinolinone‐Fused Quinoxalines Through Sequential Rh(III)/Pd(II) Catalysis

Advanced Synthesis &Catalysis, EarlyView.
A new one‐pot, dual catalytic strategy for the synthesis of polycyclic isoquinolinone‐fused quinoxalines from commercially available N‐(2‐acetamidophenyl)benzamides and 1,3‐diynes is reported. This transformation proceeds via Rh(III)/Pd(II)‐mediated sequential NH/CH activation/annulation. Detailed mechanistic studies elucidate the reaction pathway. A
Wei‐Jung Chiu, Indrajeet J. Barve, Hung‐Sheng Hsieh, Chung‐Ming Sun   +3 more
wiley   +1 more source

Discovery of annual growth in a modern olive branch based on carbon isotopes and implications for the Bronze Age volcanic eruption of Santorini. [PDF]

Sci Rep, 2021
Ehrlich Y, Regev L, Boaretto E.
europepmc   +1 more source

Gmelins handbuch der anorganischen chemie. 8. Auflage, system nummer 14, carbon. Teil B, lieferung 1, das element isotope, atom, mokekeln, einstoffsystem, dampf, diamant [PDF]

, 1968
Janet B. Van Doren
openalex   +1 more source

Recent Advances in Ene Reactions with Carbon Enophiles

Advanced Synthesis &Catalysis, EarlyView.
Recent advances in the classical intra‐ and intermolecular ene nexus with carbon enophiles (alkenes, alkynes, arynes, and allenes) show a considerable increase in structural complexity and an enormous potential for functional applications in polymer science.
Thomas J. J. Müller
wiley   +1 more source

Rare isotope studies involving catalytic oxidation of CO over platinum-tin oxide [PDF]

Results of studies utilizing normal and rare oxygen isotopes in the catalytic oxidation of carbon monoxide over a platinum-tin oxide catalyst substrate are presented. Chemisorption of labeled carbon monoxide on the catalyst followed by thermal desorption
Hess, Robert V., Hoyt, Ronald F., Upchurch, Billy T., Wood, George M., Jr.   +3 more
core   +1 more source

Is What Comes out the Same as What Goes in? A Preliminary Investigation of the Isotopic Impacts of Digestion by Red‐Tailed Hawks (Buteo jamaicensis) and Eurasian Eagle Owls (Bubo bubo)

Ecology and Evolution
We investigated isotopic diet‐excreta offset (Δdiet‐excreta) for predatory birds, and the isotopic influence of bird digestion on consumed prey tissues.
Brooke Erin Crowley, Madison Laurel Greenwood, Rachel Elizabeth Brown Reid   +2 more
doaj   +1 more source