The benzylation of a set of nine ketones provides enough information to establish how the ketone structure affects the existence of a pi-pi interaction. The presence of a phenyl moiety starting from the alpha-carbon atom and flexibility in cyclic ketones are structural features required for effective interactions. The pi-pi interaction is controlled by a polar-pi effect. Stronger interaction is achieved when slight electronwithdrawing groups are present in both pi-system. This results is explained by the predominance of the sigma-pi shells attractive interaction in an edge-to-face geometry. (C) 1997 Elsevier Science Ltd.
Aranda, Alfonso; Diaz, Angel; Diez-Barra, Enrique, Journal of the Chemical Society. Perkin transactions I, 1992, # 18, p. 2427 - 2430
作者:Aranda, Alfonso、Diaz, Angel、Diez-Barra, Enrique、Hoz, Antonio de la、Moreno, Andres、Sanchez-Verdu, Prado