Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 1271-19-8, molcular formula is C10Cl2Ti, introducing its new discovery. category: catalyst-ligand
The Fischer carbene complexes of chromium pentacarbonyl with one or two different metal-containing substituents were synthesized and studied in solution and in the solid state. The dimetallic complexes [Cr(CO) 5{C(OTiCp2Cl)(2-BT)}] (2) (BT = benzo[b]thienyl) and [Cr(CO)5{C(OEt)((eta6-2-BT)Cr(CO)3)}] (3) and trimetallic complexes [Cr(CO)5 {C(OTiCp2Cl)((eta6-2-BT) Cr(CO)3)}] (4) and [Cr(CO)5 [C(OTiCp2-Cl)Fc)] (5) (Fc = ferrocenyl) were prepared and systematically studied with respect to the reference complex [Cr(CO)5 [C(OEt)(2-BT)}] (1) for the importance of the metal substituents in influencing carbene ligand reactivity. It was clear from the crystal structure determination of 4 that most of the unoccupied space was found around the benzo[b]thienyl substituent. Hence, it was also possible to synthesize the analogous more crowded trimetallic carbene complex 5 containing an electron-donating ferrocenyl instead of the [Cr(eta6- 2-BT)(CO)3] substituent. Dilithiated ferrocene reacts with 2 equiv of chromium hexacarbonyl, which after alkylation with Et3OBF 4 affords the ferrocen-1,1?-diyl-bridged biscarbene [(Cr(CO)5)2(mu2-C2(OEt) 2Fe(C5H4)2-C,C?)}] (7), while metalation with TiCp2Cl2 resulted in the formation of the novel ferrocene-titanocene-bridged biscarbene complex [(Cr(CO)5) 2{mu2-C2(O2TiCp 2-O,O?)(Fe(C5H4)2-C,C?)} ] (6).
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI