Circular Dichroism Studies on Three Isomeric Dimethylbenzo-15-crown-5 Ethers and Some of Their Complexes

Journal Article (Journal Article)

With ethyl lactate as an optically active precursor and with employment of Williamson reactions, three isomeric and axially symmetric dimethylbenzo-15-crown-5 ethers were prepared and characterized: (5f?,15R)-5,15-dimethyl-5,6,8,9,ll,12,14,15-octahydrobenzo[6]-l,4,7,10,13-pentaoxacyclopentadecinandthe (6S,14S)-6,14-dimethyl and (8S,12S)-8,12-dimethyl isomers, termed the a, β, and γ isomers, respectively. The circular dichroism spectra of the ethers and their complexes with Na+ in CH3OH have been determined and interpreted in terms of the gross overall orientation of the macrocycle in relation to the aromatic ring. The behavior of the γ isomer with Ba + and with low ratios of K+ suggests dominance of 2:1 (sandwich) complexes. © 1983, American Chemical Society. All rights reserved.

Full Text

Duke Authors

Cited Authors

  • Mack, MP; Hendrixson, RR; Palmer, RA; Ghirardelli, RG

Published Date

  • January 1, 1983

Published In

Volume / Issue

  • 48 / 12

Start / End Page

  • 2029 - 2035

Electronic International Standard Serial Number (EISSN)

  • 1520-6904

International Standard Serial Number (ISSN)

  • 0022-3263

Digital Object Identifier (DOI)

  • 10.1021/jo00160a018

Citation Source

  • Scopus