Laboratoire de Chimie Organique, Unid de recherche AssociCe au CNRS no 464, Universid de Rouen, BP 68, 76134 MONT SAINT AIGNAN CEDEX, France. ... Abstract : Carbonyl compounds 2 are converted into conjugated dienals ,L in a one pot reaction, by a condensation with Iithio-4 trimethylsiloxybutadiene, followed by a mild acidic hydrolysis. ... Polyethylenic aldehydes are very useful building blocks in organic synthesis. In particular, they can been used for ...