Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Condensation of poorly acidic carbon compounds (pk a 18–30) with benzaldehyde was achieved by adsorption without solvent on KF-Al 2 O 3 . KF-Al 2 O 3 appears as a stronger base than KF. ... L'alumine neutre (Woelm 2084, 20 g.) est agitée avec une solution aqueuse de KF ( ...