[EN] 1,3-BENZODIOXOL-5-YLMETHYL METHYL SULFONE AND ITS DERIVATIVES, PREPARATION METHOD THEREOF AND WHITENING COMPOSITION CONTAINING THE SAME [FR] 1,3-BENZODIOXOL-5-YLMETHYLE METHYLE SULFONE ET SES DERIVES, LEUR PROCEDE DE PREPARATION, ET COMPOSITION ECLAIRCISSANTE LES CONTENANT