The photoextrusion of the SO-bridge of 7-thiabicyclo[2.2.1]hept-2-ene 7-oxides is discussed. An analysis of all the major by-products in the exemplary case of the photo reaction of 3a is given. The existence of intermediate dienes 4 has been established. Data on a comparative photoextrusion of an epithio-bridge of 7-thiabicyclo[2.2.1]-hept-2-ene (6) are provided.
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