Materials. HPIP (1),29 6-cyano HPIP (2),30 and the methoxycontaining derivative (3)29 (Scheme 1b) were prepared according to the previously reported method.
Materials. HPIP (1),29 6-cyano HPIP (2),30 and the methoxycontainingderivative (3)29 (Scheme 1b) were prepared according tothe previously reported method.