A Stable Crown Ether Complex with a Noble‐Gas Compound

Abstract Crown ethers have been known for over 50 years, but no example of a complex between a noble‐gas compound and a crown ether or another polydentate ligand had previously been reported. Xenon trioxide is shown to react with 15‐crown‐5 to form the kinetically stable (CH 2 CH 2 O) 5 XeO 3 adduct, which, in marked contrast with solid XeO 3 , does not detonate when mechanically shocked. The crystal structure shows that the five oxygen atoms …