Determination of absolute configurations by X‐ray crystallography and 1H NMR anisotropy

N Harada - Chirality: The Pharmacological, Biological, and …, 2008 - Wiley Online Library
To determine the absolute configurations of chiral compounds, many spectroscopic and
diffraction methods have been developed. Among them, X‐ray crystallographic Bijvoet …

HPLC separation of diastereomers: chiral molecular tools useful for the preparation of enantiopure compounds and simultaneous determination of their absolute …

N Harada - Molecules, 2016 - mdpi.com
To obtain enantiopure compounds, the so-called chiral high performance liquid
chromatography (HPLC) method, ie, HPLC using a chiral stationary phase, is very useful, as …

2-Methoxy-2-(1-naphthyl) propionic acid, a powerful chiral auxiliary for enantioresolution of alcohols and determination of their absolute configurations by the 1H NMR …

N Harada, M Watanabe, S Kuwahara, A Sugio… - Tetrahedron …, 2000 - Elsevier
Racemic 2-methoxy-2-(1-naphthyl) propionic acid (1, MαNP acid) was enantioresolved as its
esters derived from various chiral alcohols. For example, a diastereomeric mixture of esters …

MαNP acid, a powerful chiral molecular tool for preparation of enantiopure alcohols by resolution and determination of their absolute configurations by the 1H NMR …

Y Kasai, H Taji, T Fujita, Y Yamamoto, M Akagi… - Chirality, 2004 - Wiley Online Library
A novel methodology using a chiral molecular tool of MαNP acid (1), 2‐methoxy‐2‐(1‐
naphthyl) propionic acid, useful for preparation of enantiopure secondary alcohols and …

Practical enantioresolution of alcohols with 2‐methoxy‐2‐(1‐naphthyl)propionic acid and determination of their absolute configurations by the 1H NMR anisotropy …

H Taji, Y Kasai, A Sugio, S Kuwahara, M Watanabe… - Chirality, 2002 - Wiley Online Library
The enantioresolution of racemic alcohols as esters of 2‐methoxy‐2‐(1‐naphthyl) propionic
acid (MαNP acid 1) and the determination of their absolute configurations on the basis of 1H …

Synthesis of enantiopure phthalides including 3‐butylphthalide, a fragrance component of celery oil, and determination of their absolute configurations

M Kosaka, S Sekiguchi, J Naito… - Chirality: The …, 2005 - Wiley Online Library
Abstract Enantiopure phthalides 2 and 5–8 were synthesized via enantioresolution of the
corresponding alcohols with a chiral auxiliary of camphorsultam dichlorophthalic acid,(1S …

Convenient method for determining the absolute configuration of chiral alcohols with racemic 1H NMR anisotropy reagent, MαNP acid: Use of HPLC‐CD detector

Y Kasai, M Watanabe, N Harada - … , Biological, and Chemical …, 2003 - Wiley Online Library
A convenient method for determining the absolute configuration of chiral secondary alcohols
using the racemic NMR anisotropy reagent,(±)‐2‐methoxy‐2‐(1‐naphthyl) propionic acid …

Diastereomer Method for Determining ee by 1H NMR and/or MS Spectrometry with Complete Removal of the Kinetic Resolution Effect

H Taji, M Watanabe, N Harada, H Naoki, Y Ueda - Organic Letters, 2002 - ACS Publications
Using chiral auxiliaries, 2-methoxy-2-(1-naphthyl) propionic acid (MαNP acid)(S)-(+)-1 and
its deuterium-labeled enantiomer (R)-(−)-1-dn (n= 3 or 6), we have developed a new …

Conformational Analysis of MαNP Esters, Powerful Chiral Resolution and 1H NMR Anisotropy Tools – Aromatic Geometry and Solvent Effects on Δδ Values

Y Kasai, A Sugio, S Sekiguchi, S Kuwahara… - 2007 - Wiley Online Library
The MαNP acid method is very powerful for the preparation of enantiopure alcohols by
resolution and the simultaneous determination of their absolute configurations by the 1H …

Resolution of inherently chiral anti-O, O′-dialkylated calix [4] arenes and determination of their absolute stereochemistries by CD and X-ray methods

F Narumi, T Hattori, W Yamabuki, C Kabuto… - Tetrahedron …, 2005 - Elsevier
Inherently chiral anti-O, O′-dibenzyl-p-tert-butylcalix [4] arene 1 was resolved as the (S)-2-
methoxy-2-(naphthalen-1-yl) propionic ester by flash chromatography. Conversely, the anti …