peroxynitric acid: a convenient oxygen source for oxidation of organic compounds catalyzed by polyimidesupported manganese (iii) tetrakis(4methoxylphenyl)porphyrin acetate

In this work, a polyimide (pi) containing triazole units was synthesized using 3,5-diamino-1,2,4-triazole and pyromellitic dianhydride in n-methyl-2-pyrrolidinone. this polymer was used as a support of manganese (iii) tetrakis (4-methoxylphenyl) porphyrin acetate to attain a heterogeneous catalyst; namely mn(t4-omepp)oac@pi. the synthesized pi and mn (t4-omepp) oac@pi were characterized by different spectroscopic and analytical techniques. the resulted catalyst was applied for epoxidation of alkenes and dehydrogenation of hantzsch 1,4-dihydropyridines (1,4-dhp) by peroxynitric acid (pna; hoono2) as a convenient new oxygen source. in association with hoono2, mn (t4-omepp) oac@pi was stable and proved to be an efficient, reusable and selective catalyst for epoxidation of alkenes (36-96% yield) and dehydrogenation of hantzsch 1,4-dhp’s ( 94-100% yield).