The hydroboration of terminal allenes with pinacolborane was carried out at 50 °C in the presence of a Pt(dba)2/2PR3 catalyst. The formation of one of three possible monohydroboration products was regioselectively synthesized by choosing an appropriate phosphine ligand.
thermal properties of imidazoline-2-chalcogenones and their copper(I) derivatives are investigated. These complexes are able to act as catalysts in regioselectiveborylation of numerous unsymmetrical alkynes, yielding synthetically useful vinylboronates. Among catalysts 1–8, catalyst 4 is highly selective towards the regioselective boron addition of 1-phenyl-1-propyne.