A gem-dichloro[4.3.1]propellane and a gem-dichloro[5.3.1]propellenone

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, C 12 H 13 Cl 3 O, and (3aα,8aα)6,9,9-trichloro-2,3 5,8-tetrahydro-1H,4H-3a,8a-methanoazulen-5-one, C 11 H 11 Cl 3 O, which have resulted from different modes of cyclopropane ring cleavage within the framework of two closely related gem-di-chloro[4.3.1]propellanes.