New P∧O ligand grafted on periodically organised mesoporous silicas for one-pot bifunctionnal catalysis:: Coupling of base catalysed Knoevenagel condensation with in situ Rh catalysed hydrogenation

The 1-phosphanorbornadiene-rhodium complex (Rh-PNBD) anchored on a mesostructured porous silica matrix is the first example of a rhodium center chelated by a phosphorus and an oxygen atom belonging to the anchoring siloxane moiety. These new hybrid silicas behave as very active recyclable hydrogenation catalysts, which combined with additional grafted amino functions allow efficiently driven one-pot bifunctionnal catalysis.