Science of Synthesis

Wang, X.-Y.; Sun, X.-L., Science of Synthesis Knowledge Updates, (2020) 2, 472.

The polymers arising from allene compounds are attractive materials, as they contain functional methylene double bonds attached to the polymer backbone. However, investigations of the polymerization of allene compounds have not progressed smoothly because the cumulated double bonds in these compounds are highly active. Lack of selectivity in the polymerization process is prone to give uncontrolled microstructures or even insoluble products. Radical and ionic polymerizations of allene compounds could only accomplish low conversions without selectivity and afford products with molecular weights lower than 3000 g/mol. Using coordination polymerization, a powerful tool to provide regio- and stereoselectivity, more controllable polymerizations of allene derivatives have indeed been achieved, in which allene derivatives bearing alkoxy, amido, lactam, fluorescent, or even sugar electron-donating functional groups all work well.

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