Sterically encumbered functional groups: an investigation of endo versus exo phosphoryl complexation using proton and phosphorus-31 NMR

BP Friedrichsen, DR Powell…

Index: Friedrichsen, Bernard P.; Powell, Douglas R.; Whitlock, Howard W. Journal of the American Chemical Society, 1990 , vol. 112, # 24 p. 8931 - 8941

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Citation Number: 70

Abstract

Abstract: The synthesis of phosphine oxide bifunctional macrocycles 1-4 is reported. Additionally, the X-ray crystal structures for exo-exo diyne 1 and endo-exo hosts 2 and 4 are presented. Assignment of the two phosphorus signals in the NMR spectra of 2 and 4 and the aromatic proton signals in the'H NMR spectra of 2 and 4 is reported. The complexation behavior of macrocycles 1-4 and precyclophane 8 with a variety of neutral organic guests ...

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