Iodination and Heck alkynylation of 5,15-diphenylporphyrin. A convenient entry to asymmetrically meso-substituted porphyrins
Abstract
Iodination of 5,15-diphenylporphyrin followed by metallation and palladium(0) catalysed coupling with monosubstituted acetylenes gives zinc(II)-10-(2-substituted-alkynyl)-5,15-diphenylporphyrins.