association of carbosilanedendrons (having a phosphine at the focalpoint) with phosphorhydrazone dendrons (having a thiophosphoryl azide at the focalpoint) has been successfully carried out by ‘Staudinger click’ reaction. The corresponding Janus dendrimers possess the characteristics of both components; they are oily as the carbosilanedendrons, and they can be easily functionalized as the phosphorhydrazone