18. A one-pot synthesis of constitutionally unsymmetrical rotaxanes using sequential Cu(I)-catalyzed azide-alkyne cycloadditions Posted on April 2, 2008June 26, 2016 by dlg6123 J. M. Spruell, W. R. Dichtel, J. R. Heath, J. F. Stoddart, Chem. Eur. J. 2008, 14, 4168-4177. Full Text.