The chemistry of pyrrolic compounds. XVIII. Hydrogenation of meso-acetoxyporphyrins: meso-acetoxychlorins

Abstract

The hydrogenation of meso-acetoxyporphyrins which are unsubstituted in four neighbouring positions yields meso-acetoxychlorins. The degree of substitution and the size of each substituent determines the product ratio of meso-acetoxychlorin to meso-unsubstituted porphyrin. Attempts to obtain the meso-hydroxychlorin system by hydrolysis of the acetate were unsuccessful.