Results 221 to 230 of about 169,803 (413)
Solvent Effects in NMR Spectroscopy. I. Toluene-Induced Shifts in the Spectra of Non-Aromatic Heterocycles. A New Approach to Clarify the Origin of the Observed Solvent Shifts. [PDF]
, 1972 Kalevi Pihlaja +4 more
openalex +1 more source
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 A Mn catalyst has been rationally redesigned to repel sp3hybridised substituents while attracting sp2 substituents, and hence enable enantioselective hydrogenation of cyclic ketones. DFT calculations enable a robust prediction of the level of enantiocontrol across a range of substrates.
Conor L. Oates +3 more
wiley +1 more source
Mesoionische Sechsringheterocyclen, V Pyridinium-Ylide von Malonylheterocyclen / Mesoionic Sixmembered Heterocycles, V Pyridinium Ylides of Malonylheterocycles [PDF]
, 1975 Thomas Kappe +2 more
openalex +1 more source
Angewandte Chemie, EarlyView.A single‐step biocatalytic route to complex indolizidine and quinolizidine alkaloids is described that relies on transaminase‐triggered double intramolecular aza‐Michael methodology. In one case, a retro‐double intramolecular aza‐Michael reaction enables dynamic kinetic resolution. Abstract Biocatalysis is now a well‐established branch of catalysis and
Adam O'Connell +10 more
wiley +2 more sources
Aminosugars. XXIII. L-Idofuranose Derivatives Containing a Heterocycle atC-5,6 Position [PDF]
, 1975 Masaharu Iwakawa, Juji Yoshimura
openalex +1 more source
Chemical Bonds Containing Hydrogen: Choices for Hydrogen Carriers and Catalysts
Angewandte Chemie, EarlyView.Hydrogen carriers utilizing B─H, C─H, N─H, and O─H bonds are evaluated for their potential in hydrogen storage and release. Key candidates such as methanol, ammonia, and formic acid are examined with a focus on critical factors influencing performance, including the nature of chemical bonds, reaction pathways, and catalytic processes.
James Cashel +9 more
wiley +2 more sources
Solvent Effects in NMR Spectroscopy. II. Toluene-Induced Shifts in the Spectra of Non-Aromatic Heterocycles. Self-Association of Toluene. Solvation Clusters as the Most Probable Explanation for the Solvent Shifts. [PDF]
, 1972 Kalevi Pihlaja +4 more
openalex +1 more source
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 Through the interplay of X‐ray spectroscopy and computational analysis, we show that gold +I and +III complexes, despite their physically distinct electronic structures, tend to activate substrates to similar extents. We focus in particular on the role of electron‐sharing covalency of the metal‐ligand bonds and provide an explanation for the often ...
Evgeniya A. Trifonova +5 more
wiley +1 more source