In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 1271-19-8, name is Titanocenedichloride, introducing its new discovery. Safety of Titanocenedichloride
Group IV metallocene triphenylsiloxy chlorides, Cp2MCl(OSiPh 3) (1, M=Ti; 2, M=Zr; 3, M=Hf), and cyclic organohydroborates, Cp2M(OSiPh3){(mu-H)2BC8 H14} (4, M=Zr; 5, M=Hf), were synthesized and characterized. The new hafnocene chloride derivative 3 was obtained by treating Cp2HfCl2 with triphenylsilanol and piperidine. The 18-electron cyclic organohydroborates 4 and 5 were afforded by reacting 2 and 3 with K[H2BC8H14], the potassium salt of the 9-BBN dimer. Reaction of 1 with K[H2BC8 H14] causes reduction of the Ti(IV) center and produces the well-known Ti(III), 17-electron, paramagnetic dimer [Cp2Ti (mu-Cl)2TiCp2] (6). Single-crystal X-ray diffraction structures of 3, 4, 5, and 6 were determined.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 1271-19-8 is helpful to your research. Safety of Titanocenedichloride
Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI