title: Cyclopentenone synthesis by directed cyclization.
mesh_terms: D003500:Cyclization; D003517:Cyclopentanes / Q000138:chemical synthesis*; D007659:Ketones / Q000138:chemical synthesis; D008722:Methods; D011453:Prostaglandins / Q000138:chemical synthesis
chemical_list: D003517:Cyclopentanes; D007659:Ketones; D011453:Prostaglandins