For use as a catalyst in the carbonylation of allylic halides to give ?-unsaturated esters, see: Chem. Lett., 1873 (1989). In the presence of CsF in aqueous MeOH, catalyzes the cross-coupling of aryl boronates with aryldiazonium salts to give biaryls; no reaction occurs in anhydrous solvents: Tetrahedron Lett., 41, 6271 (2000).