On the polyenic character of anti-bridged[14]annulene. The structure of anti-1,6:8,13-bis(difluoromethano) [14]annulene at 200K

The X-ray crystal structure determination ofanti-1,6:8,13-bis(difluoromethano) 14]annulene (1) at 200 K is described. The structure has been solved by direct methods, and least-squares refinement based on 1716 reflections of non-zero weight yielded a finalR index of 0.046. The molecular structure of1 appears to be polyenic, as expected from a comparison with the structures of previously studiedanti-bridged14]annulenes, and in particular confirms conclusions previously reported from a study of the stucture ofanti-1,6:8,13-biscarbonyl 14]annulene.