Integrating Terminal CoBrn Salts into a 2D Cobalt(II) Coordination Polymer to Promote the β‐(E)−Selective Hydroboration of Alkynes

In the present study, 2D Co(II) coordination polymers (CP‐1), which integrate terminal CoBrn (CoBr2 and CoBr3) sites immobilized on the framework, are synthesized at the gram level. As a special heterogeneous catalyst, CP‐1 shows regioselectivity (β:α>99:1) and stereoselectivity (only E configuration) in the hydroboration of alkynes. The hydroboration reaction conditions are mild and cover a broad substrate range (31 examples). In addition, the heterogeneous catalyst can be recycled for at least five times.