The reactions of 1, 3-bis (α, ω-bromoalkyl)-6-methyluracils with 1, 3-bis (α, ω- ethylaminoalkyl)-6-methyluracils or 1, 3-bis (bromopentyl) thymine with butylamine afforded pyrimidinophanes containing one or two uracil units and nitrogen atoms in bridging polymethylene chains. In some cases individual geometric isomers of pyrimidinophanes differing in the mutual arrangement of the carbonyl and methyl groups at different ...