title: Kinetic isotope effects in the thermal C2-C6 cyclization of enyne-allenes: experimental evidence supports a stepwise mechanism.
abstract: Kinetic isotope effects suggest that the thermal C2-C6 cyclization of enyne-allenes proceeds through a stepwise diradical mechanism. This is even true if steric bulk at the alkyne terminus is large, contrary to theoretical predictions by Engels.
authors.affiliation: Organische Chemie I, FB 8, Universität Siegen, Adolf-Reichwein-Strasse, D-57068 Siegen, Germany. schmittel@chemie.uni-siegen.de
authors.forename: Michael
authors.initials: M
authors.lastname: Schmittel
authors.forename: Chandrasekhar
authors.initials: C
authors.lastname: Vavilala