Multicomponent Reactions and Multicomponent Cascade Reactions for the Synthesis of Sequence-Controlled Polymers.

Control over the monomer sequence during polymerization has attracted great attention in polymer science, but it remains a serious challenge. Recently, multicomponent reactions have been playing a significant role in the synthesis of sequence-controlled polymers due to their inherent advantage of combining three or more starting materials in time-saving, one-pot operations to afford complex microstructures. In this feature article, the recent representative developments in the synthesis of sequence-controlled polymers by multicomponent reactions are highlighted to give insight on the design of novel sequence-controlled polymers with sufficient molecular diversity and complexity. The main part of this article is divided into three sections according to the different polymerization strategies using multicomponent reactions: direct multicomponent polymerization, multicomponent cascade polymerization, and iterative multicomponent reaction, respectively. It is anticipated that this feature article may provide some guidance for the fabrication of sequence-controlled polymers by multicomponent reactions.