نتایج جستجو برای: achiral

تعداد نتایج: 1375  

Journal: :Molecules 2011
Tomonori Ichibakase Masato Nakatsu Makoto Nakajima

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.

Journal: :Chemical communications 2012
Nico Veling Richard van Hameren Arend M van Buul Alan E Rowan Roeland J M Nolte Johannes A A W Elemans

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.

Journal: :Dalton transactions 2009
Hui-Fen Chen Guo-Cong Guo Ming-Sheng Wang Gang Xu Wen-Qiang Zou Sheng-Ping Guo Mei-Feng Wu Jin-Shun Huang

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.

Journal: :Chemical communications 2008
Masakazu Morimoto Seiya Kobatake Masahiro Irie

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.

Journal: :Chemical communications 2007
Tamara D Hamilton Dejan-Kresimir Bucar Leonard R MacGillivray

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.

Journal: :Catalysis Science & Technology 2023

The first Z -stereoselective catechodithiolate ruthenium complexes containing achiral and chiral cyclic(alkyl)(amino)carbene ligands are reported.

Journal: :Organic & biomolecular chemistry 2003
Gabriela Islas-Gonzalez Michèle Bois-Choussy Jieping Zhu

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.

Journal: :Chemical communications 2013
Xiao-Sheng Yan Kun Wu Yuan Yuan Ying Zhan Jin-He Wang Zhao Li Yun-Bao Jiang

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.

Journal: :Chemical communications 2008
Jie Bi Varinder K Aggarwal

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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