Abstract
ABSTRACTA reaction of selenofenchone with propiolic acid in refluxing chloroform produced 1,3‐oxaselenin‐6‐one, which further reacted with acid to afford the ring‐opened product. A reaction of 1,3‐oxathiin‐6‐one prepared from thiofenchone with trifluoroacetic acid gave a Wagner–Meerwein rearranged product. In the presence of AlCl3, thiofenchone reacted with methyl propiolate to afford the corresponding rearranged ester.
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