Journal of the Chemical Society. Chemical communications p. 365 - 367 (1984)
Update date:2022-08-15
Topics:
Lockhart, Joyce C.
McDonnell, Martin B.
Clegg, William
Crown ethers with steric restraint imposed by a three-bladed propeller substituent have been synthesised and the X-ray crystal structures of one example and its NaNCS complex indicate approximately the same conformation of the propeller but quite different conformations of the ether ring in the two; n.m.r. solution spectra indicate that the flipping of the propeller and of the crown moieties are mutually restricted in these crown ethers.
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