Thermal or photochemical reactions of phenyliodonium bis(arylsulphonyl)methylides with alkenes lead normally to gem-(arylsulphonyl)cyclopropanes. Norbornene and trans-stilbene, however, afford 1 -(phenylsulphonyl)indane derivatives. The crystal structure of the title compound ( R = 0.038 for 3 468 unique observed reflections [//o(/) 2 3.01) confirmed the identity of the product with norbornene. Diarylacetylenes give 1 -(arylsulphony1)indenes. Thermal decomposition of the ylides involves a new rearrangement, with formation of aryl arenethiosulphonates.

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