A New Procedure for the Preparation of Bilirubin IIIα from Bilirubin IXα

Synthesis of Bilins

“…172) in the presence of base. By this method 2,3,17, 18-tetramethylbilirubin (174) has been obtained in 90% yield. 142 , 143 The base may be replaced by TiCl 4 as a catalyst.…”