Abstract
Unprecedented chiral oxacalixarenes were obtained from the reaction of (±)-1,1′-binaphthyl-2,2′-diol (BINOL) with 1,5-difluoro-2,4-dinitrobenzene. Structural elucidation of C 2h-symmetric meso ( R, S)-oxacalix[4]arene and D 2-symmetric racemic (as well as enantiopure) ( R, R)- and ( S, S)-oxacalix[4]arene was carried out by means of 1D and 2D NMR spectroscopy, ESI-MS, X-ray diffractometry, and circular dichroism spectroscopy.
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