Carbonium-ion photochemistry: the benzenonium–bicyclo[3,1,0]hexenyl cation photoisomerisation

Abstract
The photochemical conversion of protonated durene in fluorosulphuric acid into a bicyclo[3,1,0]hexenyl cation has been shown to proceed by a symmetry-allowed distrotatory closure rather than by a [σ2a+π2a]cycloaddition reaction.

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