A ‘calix[4]arened’ porphyrin as a new host and an oxygen carrier model

A calix[4]arene capped porphyrin 4 and its iron complex Fe4 have been prepared in high yields using calix[4]arene as a template. The former is a new host compound and the latter functions as an oxygen carrier when iron is in the divalent state and in the presence of a base.