This comprehensive review highlights the hydroelementation reactions of conjugated and separated diynes to various products including enynes, dienes, allenes, polymers or cyclic compounds, and their further transformation to valuable compounds.

A new stereoselective method for the synthesis of (E)-β-arylvinyl iodides and (E)- or (Z)-β-arylvinyl bromides from styrenes and vinyl boronates on the basis of a one-pot procedure via borylative coupling/halodeborylation is reported. Depending on the halogenating agent as well as the mode of the halodeborylation reaction, (E) or (Z) isomers are selectively formed.