G. E. Gream and C. F. Pincombe ... Organic Chemistry Department, University of Adelaide, PO Box 498D, Adelaide, SA 5001. ... Abstract Successful as well as several unsuccessful routes for the synthesis of exo- and endo-2,3,3-trimethyl- norbornane-2-carboxylic acid are described. ... Introduction As part of a program involving aspects of carbonium ion chemistry, it was decided to investigate the oxidative decarboxylation with lead ...