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Chirale 2,2′‐Polyoxaalkano‐9,9′‐spirobifluorene
Author(s) -
Prelog Vladimir,
Bedeković Davor
Publication year - 1979
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19790620725
Subject(s) - chemistry , circular dichroism , chromophore , fluorene , enantiomer , absolute configuration , stereochemistry , crystallography , photochemistry , organic chemistry , polymer
Chiral 2,2′‐polyoxaalkano‐9,9′‐spirobifluorenes From 2,2′‐diacetyl‐9,9′‐spirobifluorene (2) , twelve chiral polyethers have been prepared as potential ion‐ and enantiomer‐selective ionophores. The absolute configuration of the polyethers 15 – 17 , 19 – 22 , and 25 has been determined by chemical correlation with vespirenes [11] [29], by circular dichroism, and by X‐ray analysis. The circular dichroism of 15 – 17 , 19 and 21 depends on the size of the macrocycle and indicates that the fluorene chromophores of 19 and 21 with 13‐ and 16‐membered rings respectively deviate considerably from orthogonality.