ChemInform Abstract: Simple and Condensed β-Lactams. Part 33. AlCl3 Catalyzed Ring Closures of Some 3-Aryloxy-4-oxoazetidine-2-carboxylic Chlorides to 1H-Chromeno[3,2-b]azete-2,8(2aH,8aH)-diones and Some Reactions of the Products.

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