نتایج جستجو برای: chiral isoxazolidine

تعداد نتایج: 37508  

Journal: :Organic letters 2005
Jie Ding Vasumathi Desikan Xinxin Han Tom L Xiao Rongfang Ding William S Jenks Daniel W Armstrong

[Reaction: see text] Six chiral ionic liquids were prepared and evaluated as "chiral induction solvents" in which two different dibenzobicyclo[2.2.2]octatrienes were photoisomerized to chiral products. Enantiomeric excesses from 3 to 12% were obtained from the photochemical di-pi-methane rearrangement. Results indicate that the chiral induction derives from an ion pairing interaction of the dep...

Journal: :Chemistry 2013
Hagay Moshe Maarten Vanbel Ventsislav Kolev Valev Thierry Verbiest David Dressler Yitzhak Mastai

In this paper, we describe for the first time the synthesis of new chiral nanosized metal oxide surfaces based on chiral self-assembled monolayers (SAMs) coated with metal oxide (TiO2) nanolayers. In this new type of nanosize chiral surface, the metal oxide nanolayers enable the protection of the chiral self-assembled monolayers while preserving their enantioselective nature. The chiral nature ...

2017
Xiaoliang Ma Mingbo Pu Xiong Li Yinghui Guo Ping Gao Xiangang Luo

Chiral metamaterials represent a special type of artificial structures that cannot be superposed to their mirror images. Due to the lack of mirror symmetry, cross-coupling between electric and magnetic fields exist in chiral mediums and present unique electromagnetic characters of circular dichroism and optical activity, which provide a new opportunity to tune polarization and realize negative ...

Journal: :Journal of chromatographic science 2013
Imran Ali Syed Dilshad Alam Zeid A Al-Othman Javed A Farooqi

In medical practices, the determination of enantiomeric ratio of the chiral drugs is very important for their activities, bioavailabilities and biodegradation. Only homochiral medication is safe for humans. The chiral analysis in biological samples is the first and most important step. The present article describes the technical strategies of the enantiomeric resolution of racemic drugs in biol...

2012
Abdullah Mohammed A. Al-Majid Assem Barakat Yahia Nasser Mabkhot Mohammad Shahidul Islam

The synthesis of several novel chiral phosphoramidite ligands (L1-L8) with C(2) symmetric, pseudo C(2) symmetric secondary amines and chiral Brønsted acids 1a,b has been achieved. These chiral auxiliaries were obtained from commercially available d-mannitol, and secondary amines in moderate to excellent yields. Excellent diastereoselectivites of ten chiral auxiliaries were obtained. The chiral ...

2006
M. Diehl

We complete the analysis of twist-two generalized parton distributions of the nucleon in one-loop order of heavy-baryon chiral perturbation theory. Extending our previous study of the chiral-even isosinglet sector, we give results for chiral-even isotriplet distributions and for the chiral-odd sector. We also calculate the one-loop corrections for the chiral-odd generalized parton distributions...

Journal: :Nanoscale 2015
Xiaoyang Duan Song Yue Na Liu

Chiral nanoplasmonics exhibits great potential for novel nanooptical devices due to the generation of a strong chiroptical response within nanoscale metallic structures. Recently, a number of different approaches have been utilized to create chiral nanoplasmonic structures. However, particularly for tailoring nanooptical chiral sensing devices, the understanding of the resulting chiroptical res...

Journal: :Discrete Mathematics 2014

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