title: Cyclotetramerization of 2-dimethylamino-4-tert-butylpyrrole. The tetra-tert-butylporphyrins.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D003500:Cyclization; D004123:Dimethylamines; D011166:Porphyrins / Q000138:chemical synthesis*; D011758:Pyrroles
chemical_list: D004123:Dimethylamines; D011166:Porphyrins; D011758:Pyrroles