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Stereolabile chiral biphenyl hybrids: crystallization-induced dynamic atropselective resolution involving supramolecular interactions†
Chi-Tung Yeung,Ho-Lun Yeung,Wesley Ting Kwok Chan,Siu-Cheong Yan,Eric C. Y. Tam,Ka-Leung Wong,Chi-Sing Lee,Wing-Tak Wong
CrystEngComm Pub Date : 11/15/2012 00:00:00 , DOI:10.1039/C2CE26438B
Abstract

Crystallization-induced dynamic atropselective resolutions of three simple chiral biphenyl hybrids, (1R,1′R)-1,1′-(biphenyl-2,2′-diyl)diethanol 1, (1R,1′R)-1,1′-(biphenyl-2,2′-diyl)bis(ethane-1,1-diyl)diacetate 2 and (1S,1′S)-1,1′-(biphenyl-2,2′-diyl)bis(2,2′-dimethylpropan-1-ol) 3 were achieved. The axial chirality of the biphenyl backbones of 1–3 were found to be determined by (i) the steric bulkiness at the α position of the ortho-substituents, and (ii) the intermolecular interactions between the molecules. 1, which possesses the least sterically demanding methyl substituents, was found to form stereoselectively the S-atropisomer and gave enantiomerically pure supramolecular right-handed helices through strong and directional intermolecular hydrogen bonds in its crystal.

Graphical abstract: Stereolabile chiral biphenyl hybrids: crystallization-induced dynamic atropselective resolution involving supramolecular interactions
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