Abstract
The alkali metal ion pairs of 2,2′-bithiazolyl, bisthiazol-2-yl ketyl, bis-2-thienyl ketyl, and of two symmetrical dithienothienyl ketyls have been studied by e.s.r. in ethereal solutions in the presence of diberzo-18-crown-6 ether. The conformational stability of the latter three ketyls is much affected by the complexation of the ion pair by the cyclic ether. The sodium complexes show also a large enhancement of the energy barrier to the rotation of the aromatic groups. These results have been interpreted by postulating a sandwich structure for the crown complexes of the sodium ketyls.
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Schedule a callMore From: Journal of the Chemical Society, Perkin Transactions 2
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