Spectres photoelectroniques des composes organometalliques

Photoelectron Spectroscopy (PES) of Organometallic Compounds withCM(MGe,Sn,Pb) Bonds

“…The hyperconjugative contribution rises with the increasing size of M. In the series M 3 MPh the benzene π MOs may be also perturbed by a direct p π − d π conjugative interaction with d AOs of M. On the basis of the experimental results and of considerations analogous to those mentioned for the other series, the authors gave an estimation of this effect, which was found quite large and decreasing along the series Si > Ge > Sn. A p π − d π effect was found also in the silicon derivative in the series p-ClC 6 H 4 MMe 3 (M = C, Si, Ge, Sn) 74 . In this case the hyperconjugation minimizes the difference in orbital energy π 2 − π 3 , where π 3 is the phenyl orbital affected by the conjugation, which is stabilizing for the chlorine 3p orbitals, destabilizing for the M empty d orbitals.…”

4‐Alkyl(Aryl)‐λ5‐phosphorine; 1,4‐Dihydrophosphorin/λ5‐Phosphorin‐Umlagerung

“…21 (h3-Phosphorine)') lassen sich iiber die 1 -R-phosphabenzolkationen 3, die 1 -R-phosphabenzolanionen 4 und die 1 -R-phosphabenzolradikale 5 als Zwischenstufen in die h5-Phosphorine 2 uberfithren. Uber 3 verlaufen die oxidativen Alkoxylierungen bzw.…”