Results 181 to 190 of about 131,344 (242)

Synthesis of 2‐Aza‐Bicyclo[4.3.0]nonane Derivatives Related to the Camporidines via Intramolecular [3+2]‐Cycloaddition

European Journal of Organic Chemistry, EarlyView.
The intramolecular nitrile oxide olefin [3 + 2]‐cycloaddition offers a reliable entry toward 2‐aza‐bicyclo[4.3.0]‐nonanes, a substructure found in several bioactive piperidine alkaloids. The required oxime precursors were prepared in non‐racemic form by Ir‐catalyzed asymmetric allylation and ring‐closing metathesis.
Alicia Köcher, Tobias Wilczek, Nora Katharina Korber, Jörg-Martin Neudörfl, Bernd Goldfuss, Hans-Günther Schmalz   +5 more
wiley   +1 more source

Teaching Undergraduates X‑ray Crystallography with Porphyrins

ACS Omega
Asa Toombs, Michelle De La Cruz, Luke Van Hoosen, Zoe Y. Marr, Morgan Redington, Eva Zurek, Joyce Pham   +6 more
doaj   +1 more source

Single-cell structural biology with intracellular electron crystallography. [PDF]

Nat Commun
Bílá Š, Pinkas D, Khakurel K, Boger J, Bílý T, Hajdu J, Franta Z, de Diego Martinez I, Tuma R, Redecke L, Polovinkin V.   +10 more
europepmc   +1 more source

Rh(III)‐Catalyzed [4+2] Annulation of Imidazoles With α‐Diazocarbonyl Compounds: Direct Access to π‐Conjugated Imidazole‐Fused Isoquinolinone

European Journal of Organic Chemistry, EarlyView.
A Rh(III)‐catalyzed [4 + 2] annulation of 2‐aryl imidazoles/benzimidazoles with α‐diazocarbonyl compounds is developed for the synthesis of π‐conjugated imidazo/benzimidazo[2,1‐a]isoquinolinones systems. Mechanistic studies and control experiment reveal that the reaction proceeds via imidazole‐directed ortho C(sp2)–H activation, followed by carbene C–H
Ganesh P. Pawar, Duc Huy Le, Li Ching Shen, Sheng‐Cih Huang, Chung‐Ming Sun   +4 more
wiley   +1 more source

Quantum refinement with electron diffraction and X-ray free-electron laser data: comparative study of ribonucleotide reductase dimetal site. [PDF]

J Appl Crystallogr
Lundgren KJM, Sun X, Pacoste L, Kumar R, Hofer G, Xu H, Zou X, Högbom M, Oksanen E, Ryde U.   +9 more
europepmc   +1 more source

Remarkable Formation of Indene Derivatives Upon Friedel–Crafts Acylation Reactions

European Journal of Organic Chemistry, EarlyView.
This shows indene derivatives. Under the reaction conditions of a Friedel–Crafts acylation, alkyl benzenes underwent an unprecedented cyclopentannulation furnishing indene derivatives. Alkylbenzene derivatives react with two equivalents of pivaloyl chloride (PivCl) in the presence of aluminum trichloride under formation of indene derivatives with up to
Leah Bantel, Neels Kruse, Marc Schmidtmann, Jens Christoffers   +3 more
wiley   +1 more source

Erratum: Differences in hierarchical structural changes between unoriented P(3HB) and P(3HB-<i>co</i>-3HH) under stretching. Corrigendum. [PDF]

J Appl Crystallogr
Arakawa M, Kabe T, Iwata T, Takenaka M.
europepmc   +1 more source

Catalytic Antioxidant Activity of Acyclic and Macrocyclic Selenides: Insights Into Structure–Activity Relationships and Mechanisms From Kinetic and Computational Studies

European Journal of Organic Chemistry, EarlyView.
Structure–activity relationships of antioxidant activities of selenides were established by experimental and computational methods. Several structures displayed strong catalytic activity in an NMR‐based assay. Diverse selenides were shown to act as potent catalytic antioxidants.
Adrian I. Doig, Wen Zhou, Thomas G. Back
wiley   +1 more source

Application of differential scanning fluorimetry to X-ray protein crystallography. [PDF]

IUCrJ
Sato Y, Senda T.
europepmc   +1 more source