bearing other substituents such as a bromine atom and alkenyl, succinimide, and carbonyl groups, were prepared, and their reactions with samariumdiiodide or tributylstannane were studied. The reactions of acyl silanes occurred in various manners such as reductions, reductive alkylations, intramolecular radical cyclizations, pinacol couplings, aldol reactions, and Tishchenko reactions, depending on the nature
and 1,7-bis(acylsilanes) have been prepared using a strategy of substitution of dihalo derivatives with a synthetic equivalent of the trialkylsilylcarbonyl anion. These bis(acylsilanes) could easily be converted, under Lewis acid activation, into cis-β-hydroxyacylsilanes or the corresponding α,β-unsaturated derivatives, by means of a completely stereoselective intramolecular aldolreaction.
eta(3)-allylpalladium chloride dimer, 1,8-di-azabicyclo[5.4.0]undec-7-ene (DBU) and 1-amino-2-fluoro-1-perfluoroethyl-3 -phenylprop-1-en-3-one or 1,12-diamino-2,11-difluoro-1,12-bis(perfluorobutyl)dodeca-1,11-diene- 3,10-dione simultaneously provided two types of Pd-II complexes. One is an anionic eta(3)-allylpalladium complex with protonated DBU as counterion while the other is a neutral eta(3)-allyl(be