reaction protocol for the coupling of arenes with alkynes (the Fujiwara reaction), yielding products of formal trans-hydroarylation of the triple bond. The protocol makes use of a chelating N-heterocyclic dicarbene palladium(II) complex as catalyst and allows us to perform the reaction in a few hours with only 0.1 mol % catalyst yielding the trans-hydroarylation product in high yields and with excellent selectivity
The gold(I) complex [Au(dppbO)Cl] was synthesized by reaction of Na[AuCl4]·2H2O with 1,2-bis(diphenylphosphino)benzene (dppb) in the presence of water. This is a new method for the synthesis of a bisphosphine monoxide gold(I) complex. The new gold(I) complex was characterized by NMRspectroscopy and X-raycrystalstructure analysis. In the solid state structure a relatively short contact between the
dicarbene palladium(II) complexes and of simple palladium(II) acetate as catalysts for alkyne hydroarylation under liquid‐liquid biphasic conditions involving an ionic liquid as the catalyst‐containing phase is investigated. The results obtained under these conditions, both in terms of activity and selectivity, are compared with those previously obtained under homogeneous conditions. The catalytic efficiency