Synthesis of spirocyclic compounds : A photochemical approach

Department of Chemistry, Kurukshetra University, Kurukshetra-136 119, Haryana, India E-mail : rckamboj@rediffmail.com Fax: 91-1744-238277 Manuscript received 18 August 2008, accepted 12 November 2008 The phototransformations of 2-thienyl-3-cycloalkenyloxy benzopyrans in benzene lead to fused spirocyclic compounds bearing thiophene ring system