Cyclacenes having dislocated rings

Clockwise and anticlockwise dislocation operation on cyclacenes were define d. Certain types of dislocated cyclacenes were subjected to AMI type semiem pirical molecular orbital calculations in order to get some idea about thes e nonexistent structures. They were predicted to be more stable than the is omeric cyclacenes. The cryptoannulenic effect, which is the characteristic feature of the cyclacenes. subsides or disappears depending on the type of the dislocated system. (C) 2001 Elsevier Science B.V. All rights reserved.