The formation of complexes between aza derivatives of crown ethers and primary alkylammonium salts. Part 9. Bicyclic derivatives of diaza crown ethers

Abstract

The bridged diaza-15-crown-5 derivatives (12a–c) and (16) form complexes with alkylammonium cations RNH₃ in organic solvents. The ¹H n.m.r. spectra of the complexes (12). RNH₃ show that they are mostly of the inclusion type (3) but in a few cases a second diastereoisomeric complex, possibly (4), is also formed. These bicyclic hosts do not show particularly high selectivity in complexation on the basis of competition between pairs of guest cations.