Amphiphilic Self-Assembled
Polymeric Copper Catalyst to Parts per Million Levels: Click Chemistry
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Abstract
Self-assembly of copper sulfate and a poly(imidazole–acrylamide)
amphiphile provided a highly active, reusable, globular, solid-phase
catalyst for click chemistry. The self-assembled polymeric Cu catalyst
was readily prepared from poly(<i>N</i>-isopropylacrylamide-<i>co</i>-<i>N</i>-vinylimidazole) and CuSO<sub>4</sub> via coordinative convolution. The surface of the catalyst was covered
with globular particles tens of nanometers in diameter, and those
sheetlike composites were layered to build an aggregated structure.
Moreover, the imidazole units in the polymeric ligand coordinate to
CuSO<sub>4</sub> to give a self-assembled, layered, polymeric copper
complex. The insoluble amphiphilic polymeric imidazole Cu catalyst
with even 4.5–45 mol ppm drove the Huisgen 1,3-dipolar cycloaddition
of a variety of alkynes and organic azides, including the three-component
cyclization of a variety of alkynes, organic halides, and sodium azide.
The catalytic turnover number and frequency were up to 209000 and
6740 h<sup>–1</sup>, respectively. The catalyst was readily
reused without loss of catalytic activity to give the corresponding
triazoles quantitatively