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 4 alkylmetal(IV) halides of the type Bu2MtCl2, generated in hydrocarbon media at -78C by treating MtCl4 with 2 equiv of n-butyllithium, function as strong bases toward a variety of Bronsted acids, E-H, where E = cyclopentadienyl or substituted cyclopentadienyl, 1-alkynyl, indenyl, alkoxy, aryloxy, and disubstituted amino, to form metallocene and nonmetallocene procatalysts, E2MCl2, expeditiously and generally in high yield.
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