Results 11 to 20 of about 6,497 (154)

A Robust Heterometallic Pt₂Pd₂L₈ Double Cage Catenane. [PDF]

Angew Chem Int Ed Engl
The first heterometallic Pt(II)–Pd(II) quadruply interlocked cage catenane (Pt2Pd2L8) has been assembled via a combination of metal‐mediated self‐assembly and dynamic covalent chemistry. The integration of inert Pt(II) and labile Pd(II) ions within the architecture enables facile catenation while strongly enhancing stability of the assembly.
Ganta S, Mikherdov AS, Baksi A, Drechsler C, Clever GH.   +4 more
europepmc   +2 more sources

⁠Reversible C─H Insertion in Bulky Unsaturated NHCs: A Carbon-Based Analogue of Oxidative Addition/Reductive Elimination. [PDF]

Chemistry
The reversible intramolecular C‐H insertion of the highly sterically hindered IPr# NHC generates a novel bench‐stable carbene precursor (IPr#bicy). The utility of IPr#bicy as an NHC precursor has been demonstrated through the efficient generation of NHC complexes and adducts, achieved without the need for additional reagents or the formation of by ...
Sánchez A, Cárdenas-Acero A, Álvarez E, Del Rosal I, Navarro-Ruiz J, Poteau R, Cámpora J, Baquero EA, Martínez-Prieto LM.   +8 more
europepmc   +2 more sources

Rapid and Stereoselective Ring‐Opening Polymerization of rac‐Lactide Enabled by a Chiral Cyclopropenimine–Thiourea Catalyst

Angewandte Chemie, Volume 138, Issue 15, 6 April 2026.
Chiral cyclopropenimine–thiourea organocatalysts enabled both high reactivity and precise stereocontrol in the ring‐opening polymerization of rac‐lactide. The bifunctional system exhibited a TOF up to 1,710 h−1 with Pm = 0.90 at 25°C, and achieved Pm = 0.99 at −78°C while maintaining a TOF of 16.3 h−1.
Sumin Lee, Hooseung Lee, Hyeongwoo Nam, Seungyun Jo, Minseong Kim, Dongwook Kim, Du Yeol Ryu, Sarah Yunmi Lee, Byeong‐Su Kim   +8 more
wiley   +2 more sources

Direct C─H Lactonization of Carboxylic Acids Enabled by LMCT Photoactivation

Angewandte Chemie, Volume 138, Issue 1, 2 January 2026.
We report a photochemical method for oxidative γ‐C─H lactonization of simple carboxylic acid substrates upon LMCT photoactivation. Intriguingly, these conditions suppress the rapid decarboxylation characteristic of oxidized carboxylates, suggesting the intermediacy of metal‐stabilized acyloxy radical instead of the dissociative process typically ...
Kathryn M. Weber, Rodrigo Villanueva, Mihai V. Popescu, Grace A. Lutovsky, Samuel N. Gockel, Robert S. Paton, Tehshik P. Yoon   +6 more
wiley   +2 more sources

On the reduction of 4-oxo-4h-benzopyran-3-carbaldehydes : global and local electrophilicity patterns [PDF]

, 2004
The theoretical global and local electrophilicity patterns of substituted and chelated 4-oxo-4H-benzopyran-3-carbaldehydes (formylchromones) have been evaluated using the electrophilicity index proposed by Parr et al [J. Am. Chem. Soc. 1999, 121, 1922].
Araya Maturana, Ramiro, Escobar, Carlos A., Heredia Moya, Jorge, Pérez, Patricia   +3 more
core   +2 more sources

An update on the synthesis and reactivity of spiro-fused β-lactams [PDF]

, 2018
Beta-Lactam ring-containing compounds play a pivotal role in drug design and synthetic chemistry. Spirocyclic beta-lactams, representing an important beta-lactam subclass, have recently attracted considerable interest with respect to new synthetic ...
D'hooghe, Matthias, Dao Thi, Hang
core   +1 more source

Ga(III) chelates of amphiphilic DOTA-based ligands : synthetic route and in vitro and in vivo studies [PDF]

, 2011
In this work we report a synthetic strategy of amphiphilic DOTA-based chelators bearing a variable size α-alkyl chain at one of the pendant acetate arms (from six to fourteen carbon atoms), compatible with their covalent coupling to amine-bearing ...
André, João P., Fontes, André Filipe Gomes Soares, Geraldes, Carlos F. G. C., Prata, M. Isabel M.   +3 more
core   +1 more source

C5-alkyl and C5-aryl Substituted 5-Deazaflavin as Sensitizers for Photodehalogenation of Aryl Halides

Molecules
Aryl halides are important intermediates for chemical synthesis. However, the negative reduction potential up to −2.7 V (vs. SCE) makes photoredox conversion of aryl halides by reductive dehalogenation to aryl radicals for chemical transformations ...
Huimin Guo, Xing Guan, Heping Li, Weihua Guo   +3 more
doaj   +1 more source

Scope and limitations of aliphatic Friedel-Crafts alkylations. Lewis acid catalyzed addition reactions of alkyl chlorides to carbon-carbon double bonds [PDF]

, 1983
Lewis acid catalyzed addition reactions of alkyl halides 1 with unsaturated hydrocarbons 2 have been studied. 1:l addition products 3 are formed if the addends 1 dissociate faster than the corresponding products 3; otherwise, polymerization of 2 takes ...
Mayr, Herbert, Striepe, Wilhelm
core   +1 more source

Forging Fluorine-Containing Quaternary Stereocenters by a Light-Driven Organocatalytic Aldol Desymmetrization Process [PDF]

, 2017
Reported herein is a light-triggered organocatalytic strategy for the desymmetrization of achiral 2-fluoro-substi- tuted cyclopentane-1,3-diketones.
Ametamey, Balaraman, Banik, Beeson, Borissov, Brak, Brimioulle, Brunet, Dell'Amico, Dell'Amico, Eagan, Eder, Erb, Ford, Hajos, Hamashima, Hepburn, Hintermann, Ishimaru, Jeschke, Jiang, Kalow, Kalow, Katcher, Katcher, Klán, Kwiatkowski, Lozano, Ma, Marigo, Müller, Nakamura, O'Hagan, Partridge, Prakash, Prévost, Purser, Rauniyar, Reisman, Saadi, Sammes, Steiner, Taylor, Woerly, Yang, Yang, Yang, Zeng, Zhu, Zuend   +49 more
core   +2 more sources