The palladium-catalyzed direct arylation polymerization (DArP) has recently emerged as a viable alternative to the existing synthetic means of π-conjugated polymers based on cross-coupling reactions. DArP has a distinct advantage over cross-coupling polymerization in the synthesis of donor-acceptor type alternating copolymers (DA polymers), which have proven to be a competent component of optoelectronic devices such as organic solar cells and field effect transistors. So far, DA polymers have been prepared by Migita-Stille cross-coupling polymerization. However, this method needs toxic tin reagents for monomer preparation. Moreover, the polymerization reaction forms a highly toxic side product such as Me3SnBr. It is expected that the DArP process, which proceeds via C-H bond activation, would provide a fundamental solution for these problems.