The photoelectron spectrum and ab initio 4-31G calculations on 1,1 -difluoroallene provide unique data on the donor and acceptor properties of fluorine operating on the mutually perpendicular orbitals in a single molecule. The spectrum has been assigned by correlative analyses, by analysis of the vibrational structure in the first two bands, and by comparison with ab initio 4-31G calculations on aliene, 1,1 -difluoroallene, and tetrafluoroallene. Because fluorines have only a minor influence on the tv and * orbitals of the double bond to which they are directly attached, but have a profound energy lowering effect on the orbitals with which they "negatively hyperconjugate", 1,1-difluoroallene has one electron-rich and one electron-deficient double bond, and should provide a valuable probe of electronic characteristics and mechanisms of cycloaddition reactions.
Agradezco a todos mis amigos que no menciono porque son muchos, que me han apoyado en esta aventura de venirme a hacer lo que me gusta. Es muy importante para mí reconocer el apoyo, aún en la distancia, de mis compañeros de trabajo en la UTP, pero sobre todo de Yamid, Héctor Fabio y Gabriel. Gracias a mis hermanos por querer que emprendiera esta etapa y sobre todo gracias a John Jairo y a Rosa. Finalmente, lo más importante, de la manera más profunda, agradezco a mi compañera Luz Adriana y a mis hijos por haberme aguantado durante estos años y por aceptar mi falta de atención en ciertos momentos.
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