New macromolecular host systems. Preparation and structure of certain functionalized 2,6-diaryl-cis-1,3,5,7-tetraoxadecalin podand compounds and macro-m-cyclophanes

A series of new podands consisting of 2,6-cis-diaryl-1,3,5,7-tetraoxadecalin systems 2-7 have been prepared and fully characterized; the crystal structure of (2R,6R,9S; 9,10-P)-cis-2,6-di(p-nitrophenyl)-1,3,5,7-tetraoxadecalin 4 showed characteristic 'host-guest' packing and structural data which fitted well with the stereoelectronic features of the cis-1,3,5,7-tod system and a new class of macro-cyclophanes (9, 10) was unravelled.