Moiety for selective separation

Abstract

New C-substituted crown ethers such as ##STR1## are made by reacting a 1,2-diol (chain length m+4) with ClCH.sub.2 --(CH.sub.2 --O--CH.sub.2 --).sub.n+1 CH.sub.2 Cl. These compounds have a stronger affinity for secondary amines than for tertiary amines and therefore may be used to separate mixtures, especially when attached to polysiloxane backbones or substrates via their unsaturated bond.

Dependencies are inferred from the claim text.