The first [2.2]pyridonophane: preparation, structure and hydrogen bond pattern with water

Abstract
The dimethoxydiselena[3.3]pyridinophane 3 was prepared and transformed into 7,15-dihydroxy[2.2](2,6)pyridinophane 5a in 35% yield; the X-ray analysis of 5 proved the tautomeric structure 5b, in which [2.2]pyridonophane units are linked by water molecules to form infinite, hydrogen bonded layers.