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Incidentally in the reaction mixture with vinyl acetate two sets of strong signals consisting of distinct ABX‐coupling patterns were observed. They could not be assigned to any of the expected products. We propose these signals to be due to three different substituted β‐sultine products formed in concerted or stepwise cycloaddition reactions between sulfur dioxide andvinyl acetate. The proposed structures are as follows. A study dealing with this unusual reaction will be reported separately.

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