Results 51 to 60 of about 89,874 (280)
Angewandte Chemie, EarlyView.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 +8 more
wiley +2 more sources
Marine DrugsThe microwave-aided racemic synthesis of six 5-hydroxy-5-vinyl-2-cyclopentenone-type natural products was achieved. A key reaction involving the construction of the α-keto vinyl carbinol function was realized by applying a Mislow–Evans rearrangement of ...
Yoshihide Usami +6 more
doaj +1 more source
Racemic methyl 3,10-dioxa-2-azatricyclo[6.2.1.02,6]undecane-4-carboxylate
Acta Crystallographica Section E, 2011 The structure of the racemic title compound, C10H15NO4, consists of a tricyclic skeleton comprising a six-membered piperidine ring and five-membered isoxazolidine and tetrahydrofuran rings. The piperidine ring adopts a distorted chair conformation, while
Basem A. Moosa +3 more
doaj +1 more source
A male-produced aggregation-sex pheromone of the beetle Arhopalus rusticus (Coleoptera: Cerambycidae, Spondylinae) may be useful in managing this invasive species. [PDF]
, 2019 The longhorned beetle Arhopalus rusticus (Coleoptera: Cerambycidae, Spondylinae) is a common species in conifer forests of the Northern Hemisphere, but with global trade, it has invaded and become established in New Zealand, Australia, and South America.
McElfresh, J Steven +4 more
core +2 more sources
Stability of racemic and chiral steady states in open and closed chemical systems
, 2008 The stability properties of models of spontaneous mirror symmetry breaking in chemistry are characterized algebraically. The models considered here all derive either from the Frank model or from autocatalysis with limited enantioselectivity.
Avetisov +44 more
core +1 more source
Pd-catalyzed enantioselective aerobic oxidation of secondary alcohols: Applications to the total synthesis of alkaloids [PDF]
, 2008 Enantioselective syntheses of the alkaloids (-)-aurantioclavine, (+)-amurensinine, (-)-lobeline, and (-)- and (+)-sedamine are described. The syntheses demonstrate the effectiveness of the Pd-catalyzed asymmetric oxidation of secondary alcohols in ...
Bagdanoff, Jeffrey T. +5 more
core +2 more sources
Synthesis of Racemic Loliolide
Chemical and Pharmaceutical Bulletin, 1966 Racemic loliolide (XIII) and its diastereoisomer (XI) were synthesized from 2-bromo-2, 6, 6-trimethylcyclohexanone (II). The syntheses provide unequivocal confirmation for the proposed structure (I).
ZEN-ICHI HORII +3 more
openaire +3 more sources
Bay‐functionalized [7]Helicene Bilayer Nanographenes
Advanced Optical Materials, EarlyView.Bay‐functionalized [7]helical bilayer nanographenes are synthesized via a scalable, modular strategy enabling late‐stage diversification. Tailored methoxy, diketone, and phenazine substitutions precisely tune redox, photophysical, and chiroptical properties, delivering strong electronic circular dichroism and bright circularly polarized luminescence ...
Anmol Thanai +9 more
wiley +1 more source
Photoenzymatic Hydroalkylation Enables Streamlined Access to Aryl Glutarimide Precursors
Angewandte Chemie, EarlyView.We report a photoenzymatic hydroalkylation that enables streamlined, stereocontrolled access to aryl glutarimide precursors relevant to targeted protein degradation. Engineered flavin‐dependent “ene”‐reductases provide broad scope and high enantioselectivity through a distinct electron transfer–enantioselective proton transfer pathway.
Zhi Xu +9 more
wiley +2 more sources
Therapeutic Advances in Respiratory Disease, 2015 Objectives: The aim of the study was to compare the diagnostic yield and safety profile of sputum induction (SI) with nebulized racemic salbutamol solution versus hypertonic saline in smear-negative pulmonary tuberculosis (TB).
Warangkana Keeratichananont +3 more
doaj +1 more source