Publications [#233734] of Richard A. Palmer

Journal Articles

  1. Dyer, RB; Palmer, RA; Ghirardelli, RG; Bradshaw, JS; Jones, BA, "Circular Dichroism Studies of the Solution Structures of Chiral Pyridine Substituted Crowns and Their Complexes", J. Am. Chem. Soc., 1987, 109(16), 4780, American Chemical Society (ACS) [Gateway.cgi], [doi].
    (last updated on 2024/07/16)

    Abstract:
    The solution structures of a series of chiral pyridino-18-crown-6 macrocycles and their alkali and alkaline earth complexes have been studied with circular dichroism (CD) spectroscopy. The crowns (4S,14S)-4,14-dimethyl-2,16-dithi-oxopyridino-18-crown-6, its 2,16-dioxo analogue, its 2,16-tetrahydro analogue, and (55',135')-5,13-diphenyl-2,16-dioxo-pyridino-18-crown-6 contain pyridine chromophores that have been used as direct structural probes. The induced CD in the lowest energy n->7r* and 7r—* »ttr transitions of pyridine has been interpreted in terms of the one-electron theory of optical activity. Sector rules have been derived for each of these transitions and used to predict the structures of these crowns and their complexes. These predictions are consistent with the results obtained from 1H NMR spectroscopy. © 1987, American Chemical Society. All rights reserved.