organic compounds
The title compounds, (3a,5,6)-4,4,6-trichloro-7-methoxy-3,4,5,6-tetrahydro-2H-3a,5- methanoazulene and (3a,6)-(E)-8,8-dichloro-5-chloromethylene-6-methoxy- 1,2,3,4,5,6-hexahydro-3a,6-methano-3aH-indene, both C12H13Cl3O, were formed by mild thermolyses of two related [4.3.1]propellanes and are of interest in the development of new methods for preparing novel analogues of the anti-cancer drug TaxolTM.