organic compounds
X-ray analyses have established the structures of (3aα,7aα)-6-chloromethyl-8,8-dichloro-2,3-dihydro-5-methoxy-3a,7a-methano-1H-indene, C12H13Cl3O and (3aα,8aα)-6,9,9-trichloro-2,3,5,8-tetrahydro-1H,4H-3a,8a-methanoazulen-5-one, C11H11Cl3O, which have resulted from different modes of cyclopropane ring-cleavage within the framework of two closely related gem-dichloro[4.3.1]propellanes.