Synthesis of Functionalised Optically Active Bicyclic and Angularly Fused Tricyclic Compounds from ( l )-Menthone by Tin-Mediated Vinyl Radical Cyclization † †This paper was presented in the “Indo-German symposium on organic synthesis-growing interface with adjacent sciences”, at HCT, Hyderabad, India during Sep 27–28, 1996. Abstract : pp 143.