A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, SDS of cas: 1271-19-8, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1271-19-8, Name is Titanocenedichloride, molecular formula is C10Cl2Ti. In a Article, authors is Weiss, Andre，once mentioned of 1271-19-8
The bridging functions Me2Si, [(CH2)3(CMe2)2N]B and CH2 have been used to connect two imidazoles in the 1,1?-position. The bisimidazolyl compounds were treated with BH3 or BEt3, and the resulting N,N?-bisborane-protected products 1, 3b, 4a, and 5b were characterized by X-ray structure analyses. Reaction of 1,1?-bis(4,5-dimethylimidazolyl) methane with BBr3 yielded the macrocyclic dicationic tetraimidazolyl compound 6. The behavior of the N-protected bisimidazoles 1 and 3-5 towards deprotonating agents was investigated and it was found that 1,1?-bis(3-borane-4,5-dimethylimidazolyl)methane (5b) is deprotonated to give a dianionic dicarbene compound. Its reaction with Cp2MCl2 allowed the formation of the corresponding titanocene and zirconocene complexes 8 and 9, which were characterized by X-ray structure analyses. In 9 a 3c,2e B-H-Zr bond is present. Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI