“…The ''one pot'' synthesis with TMOS/EtOH/H 2 O in a 1/4/4 molar proportion and Fluoral-P 0.5 mol L À1 , allows a heavy doping of the xerogel, once dried (4 mol L À1 ). 38 In the xerogel pores (diameter o20 A ˚), the reactivity of Fluoral-P molecules with formaldehyde is enhanced as compared with the liquid phase, due to the confinement of the reactants in the same pore. The product issued from the reaction, 3,5-diacetyl-1,4dihydrolutidine (DDL), can be detected either via absorbance or fluorescence measurements (Fig.…”