Synthesis of Cryptophane-B: Crystal Structure and Study of Its Complex with Xenon

J Org Chem. 2018 Dec 7;83(23):14465-14471. doi: 10.1021/acs.joc.8b02246. Epub 2018 Nov 28.

Abstract

Whereas the synthesis of the anti-cryptophane-A (1) derivative has been known for nearly 40 years, the preparation of its diastereomer (cryptophane-B according to Collet's nomenclature) has never been reported. Thus, the synthesis of the cryptophane-B derivative represents a real challenge for chemists interested in the preparation of these hollow molecules. Herein, we describe a synthetic route that allows us to prepare cryptophane-B (2), albeit in a low yield. The X-ray crystallographic structure of this compound is described, and it reveals the presence of an ethanol molecule inside the cavity of the host. Finally, the ability of cryptophane-B to bind xenon in 1,1,2,2-tetrachloroethane- d2 is also studied via hyperpolarized 129Xe NMR.

Publication types

  • Research Support, Non-U.S. Gov't