Halogen exchange by reaction of CpRu(Cl)(PPh3)2 with MeC(O)X (X = Br, I) and its mechanistic study

Mechanism of halide exchange in reactions of CpRu(PPh3)2Cl with haloalkanes

Kinetic measurements of the reaction between CpRu(PPh3)2Cl (1a) and 1-bromobutane reveal a nearly first order dependence on the concentration of haloalkane and a negative entropy of activation, ΔS† < 0.

Kinetics of phosphine substitution in CpRu(PPh3)2X (X = Cl, Br, I, N3, and NCO)

The kinetics of phosphine substitution in CpRu(PPh₃)₂X (X = Cl, Br, I, N₃, and NCO) is consistent with a dissociative mechanism. The complexes react with chloroform to yield CpRu(PPh₃)₂Cl by a mechanism that involves phosphine loss.

CuBr2-promoted cyclization and bromination of arene–alkynes: C–Br bond formation via reductive elimination of Cu(iii) species

A CuBr₂-promoted cyclization and bromination of arene–alkynes was developed, affording 9-bromophenanthrenes via reductive elimination of the Cu(iii) species.