PRECURSORS OF AZA-MACROCYCLES - CHARACTERIZATION OF SUBSTITUTED PHENANTHROLINES AND RELATED BASES - CRYSTAL AND MOLECULAR-STRUCTURE OF DICHLORO-DI-N-BUTYL(2,2',6,6'-BIPYRIMIDINE)-TIN(IV)

The synthesis, characterization and H-1 NMR spectra of some substituted i,10-phenantrolines are described. These are precursors Of azacyclophanes which are, along with their metal complexes, insoluble in polar solvents. It is suggested that the use of substituted 2,2,,6,6'-bipyrimidines as precursors would lead to soluble macrocycles. The crystal and molecular structure of dichloro-di-n-butyl-(2, 2',6, 6'-bipyrimidine) tin(IV) shows this ligand to be planar and bidentate.