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An efficient procedure for the synthesis and isolation of (+)-(2R,3R,11R,12R)- and (−)-(2S,3S,11S,12S)-tetraphenyl-18-crown-6

✍ Scribed by John Crosby; Martin E. Fakley; Colin Gemmell; Keith Martin; Andrew Quick; Alexandra M.Z. Slawin; Hooshang Shahriari-Zavareh; J. Fraser Stoddart; David J. Williams

Publisher: Elsevier Science
Year: 1989
Tongue: French
Weight: 326 KB
Volume: 30
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)80675-4

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✦ Synopsis

octadecanes have been preparedin single step reactions from the readily-available chiralprecursors, (RR)-and (5%).hydrobenzoins, followed by bulk isolations of the pure Id-crown-6 derivatives via their I.9 crystalline complexes with potassium nitrate (for the Uiphenyl derivative) or calcium nitrate (for the tetraphenyl derivative), obtaineddirectly from the worked-up crude reaction mixtures: X-ray crystal structures character&e the uncomplexed (RRRR)tetraphenyi-l&crown-6 and the 1 :I complex formed between its (SSSS)-enantiomer and calcium nitrate.

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