a new and general synthetic procedure for the exhaustive and selective introduction of hydroxy groups at the upperrim of calix[4]arenes in the cone conformation is reported. The aldehyde-derivatives of tetraalkoxycalix[4]areneshave been oxidized by Baeyer-Villiger reaction. The introduction of amino and hydroxy groups on calix[4]arenehaving a rigid cone conformation has been achieved for the first