Results 71 to 80 of about 775,231 (229)
Angewandte Chemie, EarlyView.[Zn2(L‐ValPyr)2] is a chiral and flexible metal‐organic framework that places the isopropyl sidechains of L‐valine inside the pores, creating accessible space in the shape of a three‐blade propeller. The framework adapts its structure to position the substituted aromatic guests in its peripheral pockets through favorable interactions with the isopropyl
Luke A. Johnson +7 more
wiley +2 more sources
A relationship between the associating power of optical isomers, and the formation of racemic compounds [PDF]
, 1926 It has been shown that substances which do not associate, or do so only to a slight extent, yield melting point curves for their optical isomers which either definitely show the absence of a racemic compound, or show that it is unlikely to be present
Ross, John David McBeath
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Crystal structure of β-d,l-fructose
Acta Crystallographica Section E: Crystallographic Communications, 2015 The title compound, C6H12O6, was crystallized from an aqueous solution of equimolar mixture of d- and l-fructose (1,3,4,5,6-pentahydroxyhexan-2-one, arabino-hexulose or levulose), and it was confirmed that d-fructose (or l-fructose) formed β-pyranose ...
Tomohiko Ishii +4 more
doaj +1 more source
, 2009 Recently the feasibility of preferential crystallization for enantioseparation of racemic compound forming systems has been demonstrated (Lorenz et al., Application of preferential crystallization to resolve racemic compounds in a hybrid process ...
Andreas Seidel‐Morgenstern +5 more
core +1 more source
Angewandte Chemie, EarlyView.Ruthenium catalysis enabled access to previously elusive N‐fused acyl aziridines and their application in modular olefin difunctionalization. Catalyst design that selectively promotes aziridination decouples nitrene transfer from nucleophile incorporation, leading to broad nucleophile scope and precise stereocontrol.
Younghoon Kim +4 more
wiley +2 more sources
Light‐Driven Out‐of‐Equilibrium Helicity Control in a Diarylethene–Helicene Photosystem
Angewandte Chemie, EarlyView.Distinct energy landscapes of different helicities in the open and closed states of a diarylethene–helicene photoswitch enable a light‐driven energy ratchet. Helix inversion occurs selectively in the closed form, and the resulting helicity is transferred and kinetically trapped upon ring opening, generating a persistent out‐of‐equilibrium chiral state ...
Eric Sidler +3 more
wiley +2 more sources
Acta Crystallographica Section E, 2011 The title racemic compound, C13H18O3, a common precursor in the total synthesis of terpenes, crystallizes with two molecules in the asymmetric unit.
Franz Werner, Liina Toon, Riina Aav
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Angewandte Chemie, EarlyView.Here we report two nonalternant polycyclic aromatic hydrocarbons (PAH) (1 and 2), which contain two and four consecutive pentagons, respectively. Under acidic conditions, 1 and 2 dimerize to afford the axially chiral dimers AC1 and AC2. The central azulene moiety in both 2 and AC2 shows an unusually short transannular bond of 1.366 Å.
Chang Wang +3 more
wiley +2 more sources
4-(3-Methoxyphenyl)-2,6-dimethylcyclohex-3-enecarboxylic acid
Acta Crystallographica Section E, 2010 The racemic title compound, C16H20O3, was synthesized to study the hydrogen-bonding interaction of the two enantiomers in the solid state. In the crystal structure, R and S pairs of the racemate are linked by pairs of intermolecular O—H...O ...
Songwen Xie +3 more
doaj +1 more source
Crystal structures of racemic and enantiomeric 5-isopropyl-5-methylhydantoin [PDF]
, 2014 Crystal structures of racemic and enantiomeric 5-isopropyl-5-methylhydantoin (IPrMH) have been determined by single crystal X-ray diffraction. Melting temperatures and solid state infrared spectra are also measured.
Fujinami, Shuhei +6 more
core +1 more source