نتایج جستجو برای: achiral
تعداد نتایج: 1375 فیلتر نتایج به سال:
Lithium diphenylbinaphtholate catalyzed the enantioselective Evans-Tishchenko reduction of achiral β-hydroxyketones to afford monoacyl-protected 1,3-diols with high stereoselectivities. In the reaction of racemic β-hydroxyketones, kinetic optical resolution occurred in a highly stereoselective manner.
Self-assembling achiral and chiral porphyrin trimers based on benzene tricarboxamide exhibit amplification of chirality only in solvents in which the assemblies are dynamic enough to rearrange their constituting components.
The first eight-coordinated trivalent lanthanide complexes with an achiral ligand 6,7-dicyanodipyridoquinoxaline (dicnq), [DyCl(3)(dicnq)(2)](n) (1 and 1') were found to exhibit spontaneous chiral resolution, SHG active (two times that of KDP) and blue luminescence.
A photochromic diarylethene containing naphthyl groups formed a chiral crystal when co-crystallized with octafluoronaphthalene, although both molecules are achiral, and underwent highly enantioselective photocyclization owing to the conformational confinement in the crystal.
An achiral ligand, synthesized in the solid state via a coded hydrogen bond-directed organic synthesis, self-assembles with Cu(II) ions to form a chiral tetrahedral capsule that hosts an anion as a guest.
The first Z -stereoselective catechodithiolate ruthenium complexes containing achiral and chiral cyclic(alkyl)(amino)carbene ligands are reported.
Using chiral quaternary ammonium hydroxide as base, cycloetherification of linear achiral diarylheptanoid 5, by way of an intramolecular SNAr reaction, provides enantiomerically enriched cyclophane 6 in good to excellent yield.
Transforming the C-terminal amide of a glycinylphenylalanine dipeptide into N-amidothiourea affords a β-turn structure in the formed dipeptide based N-amidothioureas, which can be readily identified by an induced CD signal from the achiral phenylthiourea chromophore.
The total synthesis of 8a-epi-swainsonine has been achieved in 20% overall yield from R-glyceraldehyde dimethylacetonide 3 through epoxidation with the achiral furyl-substituted sulfonium ylide 2d as one of the key steps.
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