title: Change of connectivity on catenane ring: ring expansion by annulation-ring scission sequence.
abstract: [reaction: see text]. Ring expansion of a catenane without destruction of the interlocked structure was attained by Diels-Alder reaction followed by ozonolysis. Annulation by Diels-Alder reaction introduced a C4 fragment onto the ring, and the ozonolysis scissored the resulting double bond to expand the catenane ring. The annulation-ring scission sequence provides a general approach for changing the connectivity on a catenane ring without destroying the interlocked structure.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1-1, Sakai, Osaka 599-8531, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Watanabe
authors.forename: N
authors.initials: N
authors.lastname: Kihara
authors.forename: T
authors.initials: T
authors.lastname: Takata