SEARCH Articles Figures Tables 1- Methyl pyridine 1.4- Dihydropyridines 1.4- Dinitro-2-methyl 2.4- Dinitro-l-methyl 4,6-Dinitro-l- Dihydropyridine Methyl conversion Pyridin methylation Pyridines dihydropyridine Pyridines dihydropyridines