Preparation of some nitrogen-containing polyether ‘crown’ compounds

Abstract

New polyether crown ligands containing four and five donor sites per molecule and with one or two of the ether linkages replaced by secondary or tertiary amino-groups have been synthesised. The synthesis did not work for potential crowns containing three donor atoms (nine-membered rings) but gave morpholines exclusively. Characterisation of the structures obtained by a variety of spectroscopic methods is discussed.