Polyglymes are linearized versions of them, and along with quaternary amines they can be used as phase transfer catalysts.
Green's method of synthesizing these compounds takes advantage of the template effect. Zza analogues of these compounds include cyclen, and Lehn synthesized a three-dimensional version of one of these compounds called a cryptand. Polyglymes are linearized versions of them, and along with quaternary amines they can be used as phase transfer catalysts. Initially synthesized by Charles Pedersen, they are a simple example of a macrocyclic compound. For 10 points, name this class of compounds that can complex with cations, which consists of carbon and oxygen groups arranged in a ring, and are a specific type of ether.
Green's method of synthesizing these compounds takes advantage of the template effect.
{Crown ethers} [prompt on {ethers}; accept {crown} after “{ether}”]