It has been reported in the previous papera that 2, 2'-bibenzoxazoline and its 2, 2'-dimethyl derivative were formed by the condensation of o-aminophenol (2 mol.) with glyoxal (1 mol.) and with diacetyl (lmol.), respectively. Now, condensation of skeletal derivatives of o- aminophenol with several kinds of a-dicarbonyl compounds was studied and the structures of these condensation products were determined. The condensation reaction proceeded ...
