title: Ethynylogization of a coarctate fragmentation
abstract: Coarctate reactions form a separate class of elementary closed-shell processes in addition to polar and pericyclic reactions. Hence, they also follow a different homology principle. Whereas vinylogous polar and pericyclic reactions differ in the length of the reacting system by a double bond, coarctate reactions can be homologized (ethynylogized) by extending a known system by a triple bond. The prediction, which is based on theoretical considerations, is confirmed experimentally by the fragmentation of cyclopropylethynyl nitrene to cyano acetylene and ethylene, a reaction that is "ethynyloguous" to the known fragmentation of cyclopropyl nitrene to ethylene and HCN.
authors.affiliation: Institut fur Organische Chemie, Technische Universitat, Braunschweig, Germany. r.herges@tu-bs.de
authors.initials: R
authors.lastname: Herges
authors.initials: D
authors.lastname: Geuenich
authors.initials: G
authors.lastname: Bucher
authors.initials: C
authors.lastname: Tonshoff