Results 121 to 130 of about 21,735 (237)

Valence Threshold Photoionization Spectra of C5$_5$H and C5$_5$H2$_2$ Isomers

ChemPhysChem, Volume 27, Issue 8, 28 April 2026.
Mass‐selected threshold photoelectron spectra (TPES) of l‐C5H, HC5H, and c–C3H‐CCH were recorded using double‐imaging photoelectron‐photoion coincidence spectroscopy. These transient species were generated in situ by hydrogen abstraction from cyclopropylacetylene and 1,3‐pentadiyne.
Ugo Jacovella, Myriam Drissi, Bérenger Gans, Corentin Rossi, Gustavo A. Garcia, Hai Linh Le, Mengxu Jiang, Jean‐Claude Guillemin, Séverine Boyé‐Péronne, Jean‐Christophe Loison   +9 more
wiley   +1 more source

A Convenient, Safe, and Atom‐Economical Route to a Large Portfolio of Grubbs‐Type Catalysts for Olefin Metathesis via Four‐Coordinate Ruthenium Alkylidynes

Angewandte Chemie, Volume 138, Issue 16, 13 April 2026.
It may seem counterintuitive to first target a ruthenium alkylidyne when Grubbs‐type ruthenium carbene complexes are the actual goal. In the end, however, this tactic pays valuable dividends in terms of practicality, atom economy, flexibility as well as safety: the new route provides ready access to a large assortment of catalysts for alkene metathesis
Mingxu Cui, Alois Fürstner
wiley   +2 more sources

Imine Directed Cp*Rh^III -Catalyzed N-H Functionalization and Annulation with Amino Amides, Aldehydes, and Diazo Compounds. [PDF]

Angew Chem Int Ed Engl, 2023
Zoll AJ, Molas JC, Mercado BQ, Ellman JA.   +3 more
europepmc   +1 more source

Photocatalytic Cross‐Coupling of Phenols and Heteroaryl Halides With Machine Learning‐Guided Reaction Prediction

Angewandte Chemie, Volume 138, Issue 16, 13 April 2026.
Photocatalytic cross‐coupling: A redox‐neutral photochemical method enables direct C(sp2)─C(sp2) bond formation between phenols and heteroaryl halides using an organic dye and base. Complementary radical generation allows efficient cross‐coupling in up to 91% yield. Mechanistic studies, DFT, HTE, and machine learning rationalize and predict reactivity,
Matthew C. Carson, Alice Wu, Kalyana B. Duggal, Madeline E. Rotella, Marisa C. Kozlowski   +4 more
wiley   +2 more sources

SuFExable NH-Pyrazoles via 1,3-Dipolar Cycloadditions of Diazo Compounds with Bromoethenylsulfonyl Fluoride. [PDF]

J Org Chem, 2022
Yamanushkin P, Kaya K, Feliciano MAM, Gold B.   +3 more
europepmc   +1 more source

Asymmetric Donor–Acceptor 2,7-Disubstituted Fluorenes and Their 9-Diazoderivatives: Synthesis, Optical Spectra and Photolysis

Molecules
In a search for dyes photoactivatable with visible light, fluorenes with substituents at positions 2 and 7 were prepared, and their absorption and emission spectra were studied.
Andrei I. Savchenko, Vladimir N. Belov, Mariano L. Bossi, Stefan W. Hell   +3 more
doaj   +1 more source

B(C₆F₅)₃-Catalyzed Diastereoselective and Divergent Reactions of Vinyldiazo Esters with Nitrones: Synthesis of Highly Functionalized Diazo Compounds. [PDF]

Org Lett, 2023
Stefkova K, Guerzoni MG, van Ingen Y, Richards E, Melen RL.   +4 more
europepmc   +1 more source

Enantioselective Gas Chromatographic Analysis of Cyclopropane Derivatives [PDF]

, 2018
Chirasil-β-Dex was used as chiral stationary phase for the enantioselective gas chromatographic analysis of several new chiral cyclopropane derivatives.
Aboul-Enein, H. Y., Ghanem, A., Grass, S., Jiang, Z., Lacrampe, F., Müller, P.   +5 more
core  

Planar Chirality Controls Diastereotopicity in [2.2]Paracyclophanyl Cyclopropenes

Chemistry – A European Journal, Volume 32, Issue 16, 25 April 2026.
In this work, we report the synthesis of [2.2]paracyclophane‐substituted cyclopropenes via rhodium‐catalyzed cyclopropenation using a pCp‐derived carbene precursor. The planar chiral framework induces diastereotopic differentiation of otherwise equivalent alkyl substituents, which is reflected in their 1H NMR spectra.
Tilman Köhler, Maximilian Hartmann, Olaf Fuhr, Stefan Bräse   +3 more
wiley   +1 more source

Cobalt Diazo-Compounds: From Nitrilimide to Isocyanoamide via a Diazomethanediide Fleeting Intermediate. [PDF]

Angew Chem Int Ed Engl, 2021
Aghazada S, Fehn D, Heinemann FW, Munz D, Meyer K.   +4 more
europepmc   +1 more source