Syntheses and Crystal Structures of 4,4′Diformyl-diphenoxyethane and 4,4′4′′-Triformyl-triphenoxytriethylamine

1 INTRODUCTION With the methods of 2+3] and 1+1] tripodal condensation of polyaldehyde with polyamine, many Schiff bases and their relative reduced polyaza cryptands have been facilely synthesized in high yields1～5]. In this one-step route, some metal ions such as alkali2, 6, 7], alkali earth8], rare earth9, 10] and other transition ions4, 11, 12] were used as templates13, 14]. Formerly, the dialdehydes are needed to be rigid structures15] to prevent themselves from polymeri…