Photobisdecarbonylation of benzonorbornene-2,3-dione at low temperatures: isolation and characterisation of novel isoindene (2H-indene) dimers
Abstract
Photolysis of benzonorbornene-2,3-dione in acetone at –60 °C yields a diastereomeric mixture of 1-(indanyl)-1H-indenes considered to arise from [8π+ 8π+ 2 σ]-cyclodimerisation of isoindene: these structures have been confirmed by synthesis, and full stereochemical assignments made following conversion into dihydro-derivatives.