BUCKLEY, B.R. ... et al, 2011. Heterogeneous catalytic reactions "on water" by using stable polymeric alkynylcopper(I) pre-catalysts: alkyne/azide cycloaddition reactions. European Journal of Organic Chemistry, 4, pp. 770 - 776.
Dinuclear alkynylcopper(I) complexes have been found to be the active pre-catalysts in copper-catalysed cycloaddition of azides and terminal alkynes (CuAAC). These copper(I) ladderane polymers are used in “on water” CuAAC reactions, with loadings as low as 1 mol-%.