Results 171 to 180 of about 28,431 (272)

Oxygen‐Acceptor‐Driven High Photochromic Contrast Solid‐State Excited‐State Intramolecular Proton Transfer Photoswitches

Angewandte Chemie, EarlyView.
The excited‐state intramolecular proton transfer (ESIPT) photoswitch tpmSA, which features an oxygen−acceptor, exhibits higher photochromic contrast (ΔE*Lab>74) than its nitrogen‐acceptor Schiff base analogues (ΔE*Lab<30). Theoretical calculations indicate that tpmSA effectively suppresses GSIPT, thereby enhancing the contrast.
Yahui Chen, Wenjing Wang, Hao Gu, Qinlin Yuan, Yeju Lee, Xin He, Chao Wang, Yaqian Huang, Juyoung Yoon, Xiaoqiang Chen, Xiaojun Peng   +10 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, EarlyView.
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   +1 more source

Synthesis and structural characterization of the <i>Z</i>-isomer of 1,2-bis(tetrazol-5-yl)ethylene (H₂bte) <i>via</i> photoinduced isomerization. [PDF]

RSC Adv
Shi J, Liao S, Huang S, Jiang T, Wang K, Zhang W.   +5 more
europepmc   +1 more source

Isomerization of carotenoids [PDF]

Biochemical Journal, 1938
L, Zechmeister, P, Tuzson
openaire   +2 more sources

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

Angewandte Chemie, EarlyView.
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   +1 more source

Improved Surgical Management of Complex Neonates With Heterotaxy Syndrome. [PDF]

World J Pediatr Congenit Heart Surg
Mills AC, Dawson AE, Scott MC, Kennedy AM, Bequeaith BA, Zoupas I, Salazar JD, LaPar DJ.   +7 more
europepmc   +1 more source

NiH‐Catalyzed Enantioconvergent α‐Alkenylation of Carbonyl Compounds via Markovnikov Alkyne Hydronickellation

Angewandte Chemie, EarlyView.
A NiH‐catalyzed α‐alkenylation via Markovnikov hydronickellation of alkynes enables convenient access to α‐chrial β‐methylene carbonyl frameworks that are prevalent in biorelevant molecules. High regio‐ and enantioselectivities have been achieved with excellent functional group tolerance and applicability toward complex structures. The β‐methylene unit
Hyeontaek Nam, Seji Jang, Dongwook Kim, Sangwon Seo   +3 more
wiley   +1 more source

One‐Pot Amidation/C─H Halogenation by an Efficient Electrochemical Cascade

Angewandte Chemie, EarlyView.
A sustainable electrochemical cascade enables the one‐pot synthesis of regioselectively halogenated N‐aryl amides from readily available amines and acyl halides under mild conditions. The method merges amidation and C─H halogenation in a single operational step, delivering broad substrate scope, high selectivity, and scalability, and provides an ...
Sudipta Ponra, Ruzal Sitdikov, Hasil Aman, Alyssio Calis, Gergely Laczkó, Virgile Rouffeteau, Maxime R. Vitale, Imre Pápai, Oscar Verho   +8 more
wiley   +1 more source

Synthesis of sulfanyl derivatives of 1,2,4-triazoles <i>via</i> an acid catalyzed intramolecular cyclization of isothiosemicarbazones: structural characterization, <i>E</i>/<i>Z</i> isomerism, mechanistic insights and <i>in vitro</i> cytotoxicity. [PDF]

RSC Adv
Snisha K, Karthikeyan MC, Bhuvanesh N, Arockiam AJV, Karvembu R.   +4 more
europepmc   +1 more source

Synthesis, Functionalization, and Reactivity of Vinyl Sulfondiimidamides

Angewandte Chemie, EarlyView.
Combining unsymmetrical sulfurdiimide reagents (R‐NSN‐R1) and Grignard reagents, followed by oxidative amination, delivers a series of vinyl sulfondiimidamides. Reactivity with cysteine and lysine derivatives is shown, and the cysteine reactivity is mapped in detail. Variation of the two imidic N‐substituents can be used to tune reactivity of these new
Katherine G. Rodden, Agamemnon E. Crumpton, Samuel E. Dalton, Michael A. Clegg, Michael C. Willis   +4 more
wiley   +1 more source