Download 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. ... A second generation of dendrimer with calixcrown as repeat unit was first synthesized. Its structure and conformation was determined by 1 H NMR and MALDI-TOF mass spectra. ... There are two basic approaches for the stepwise synthesis of dendrimers: The divergent approach 2 and ...