Chemistry is an experimental science, Recommanded Product: Titanocenedichloride, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 1271-19-8, Name is Titanocenedichloride
Bis(trimethylphosphane)titanocene (1) and (eta2-Ethene)(trimethylphosphane)titanocene (2) react with one equivalent of allene (3a), phenylallene (3b), 1,1-dimethylallene (3c), and 1,1-diphenylallene (3d) readily by displacement of one trimethylphosphane from 1 and of ethene from 2 to give regiospecifically the corresponding (eta2-allene)(trimethylphosphane)titanocene complexes 4a-d in good yields.From (eta2-1-butene)(trimethylphosphane)zirconocene (6) and 3d the corresponding (1,2-eta2-3,3-diphenylallene)zirconocene complex 7d is obtained in the same manner.The structures of these new allene complexes have been established unambiguously by 1H- and 13C-NMR-spectroscopy.A crystal structure analysis of the titanocene complex 4d confirms the spectroscopic structure determination.All the above mentioned allene-metallocene complexes consume readily a second equivalent of the allene derivatives to produce, in most cases, regiospecifically the corresponding 1-metalla-2,5-dimethylenecyclopentane derivatives 5a-d (M = Ti) and 8c, d (M = Zr); only the (allene)zirconocene complex 7a gives rise to a 1:1 mixture of the regioisomers 8a and 9.More conveniently 5a-d and 8c, d are synthesized directly from metallocene dichloride and the corresponding allenes 3. – Key Words: Titanocene, complexes of / Zirconocene, complexes of / Allene complexes / 1-Metalla-2,5-dimethylenecyclopentane complexes
Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Recommanded Product: Titanocenedichloride, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 1271-19-8, in my other articles.
Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI