X-ray analysis of the Bisphenol-A-type macrocyclic carbonate trimer

Collection of the single crystal X-my refraction data of the Bisphenol-A-ty pe Macrocyclic oligocarbonate trimer (c-3mer) at room temperature was carri ed out. The single crystal of the cyclic trimer that is recrystallized from ethyl acetate showed solvent molecule in the center of macro ring. Similar ly, cyclic tetramer (c-4mer) contained two p-xylene molecules. Smaller dime r (c-2mer) did not afford co-crystal with solvent. Conformation of the carb onate in c-3mer was s-cis and s-cis as in c-4mer. A relationship between th e conformation of carbonate and noncatalyst polymerization activity was not found. Copyright (C) 2000 John Wiley & Sons, Ltd.