Synthesis of Pyridazine Derivatives with Sulfur-Containing Substituent. II. A Novel Cyclization Furnishing the Concurrent Formation of 2, 7-Dibenzyldipyridazo-[4, 5-b : 4', 5'-e]-1, 4-dithiin-1, 6 (2H, 7H)-dione and 2, 8-Dibenzyldipyridazo [4, 5-b : 4', 5'-e]-1, 4-dithiin-1, 9 (2H, 8H)-dione. (1)
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