Title Efficient and metal-free oxidation of 1,4-dihydropyridine and urazole derivatives with Poly-(4-vinylpyridinium nitrate) and Cellulose Sulfuric Acid. Type Presentation Keywords 1,4-Dihydropyridines, Urazole, Poly-(4-vinylpyridinium nitrate), Cellulose sulfuric acid. Abstract Efficient and metal-free oxidation of 1,4-dihydropyridine and urazole derivatives with Poly-(4-vinylpyridinium nitrate) and Cellulose Sulfuric Acid. Researchers ali akbari (First researcher)