Enantiopure anthrylene-ethynylene cyclic tetramer and racemization via rotation of anthracene unit about acetylenic axes.

Abstract

Four anthracene and four acetylene units are used to construct a chiral pi-conjugate macrocycle, the chirality of which is due to the restricted rotation about acetylenic axes. Enantiomers were readily resolved by chiral HPLC and racemized slowly even at 70 degrees C. 
DOI: 10.1021/ol702783v

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@article{Ishikawa2008EnantiopureAC, title={Enantiopure anthrylene-ethynylene cyclic tetramer and racemization via rotation of anthracene unit about acetylenic axes.}, author={Takeharu Ishikawa and Toshiaki Shimasaki and Haruo Akashi and Shinji Toyota}, journal={Organic letters}, year={2008}, volume={10 3}, pages={417-20} }