Palladium-catalyzed cross-coupling of perfluoroalkenylzinc reagents with aryl iodides. A new, simple synthesis of .alpha.,.beta.,.beta.-trifluorostyrenes and the stereoselective preparation of 1-arylperfluoropropenes
1,3-Dimethyl-5-iodouracil reacts smoothly with perfluorovinyl- (and E/Z-pentafluoropropenyl)-zinc iodides in the presence of Pd° as a catalyst yielding the appropriate 5-perfluoroalkenyl derivatives of uracil at high and moderate yield. In an analogous reaction, 1,3-dimethyl-6-iodouracils did not yield the expected coupling products.