Construction of tetralin skeletons based on rhodium-catalysed site-selective ring opening of benzocyclobutenols

Tetralins (tetrahydronaphthalenes) are synthesised from benzocyclo-butenols based on the rhodium-catalysed site-selective ring opening followed by intermolecular/intramolecular conjugate addition of the resulting arylrhodium species to electron-deficient alkenes. The produced structures make a remarkable contrast with those available from the same compounds under thermal reaction conditions.