273200-60-5Relevant academic research and scientific papers
Hydride ion abstraction from titanocene cyclic organohydroborates, Cp2Ti{(μ-H)2BR2} (R2 = C4H8, C5H10, C8H14), as a function of solvent
Ple?nik, Christine E.,Liu, Fu-Chen,Liu, Shengming,Liu, Jianping,Meyers, Edward A.,Shore, Sheldon G.
, p. 3599 - 3606 (2008/10/08)
Hydride abstraction reactions of titanocene cyclic organohydroborate complexes Cp2Ti{(μ-H)2BR2} (R2 = C4H8, C5H10, C8H14) with B(C6F5)3 were investigated as a function of solvent. It was determined that the coordinating ability of the solvent directed the course of these abstraction reactions. The reaction in toluene, a noncoordinating solvent, produced a metathesis product, Cp2Ti{(μ-H)2B(C6F5)2} (1), in which the cyclic organohydroborate H2BR2 was substituted by H2B(C6F5)2. In diethyl ether and THF, the salts [Cp2TiL2] [HB(C6F5)3] (2, L = Et2O; 3, L = THF) consisting of titanocene cations with solvent ligands were isolated. Salt 2 is the first structurally characterized [Cp2TiL2]+ cation containing diethyl ether solvent ligands. The diethyl ether molecules of the cation in 2 are weakly coordinated and are labelized in THF and toluene. Dissolution of 2 in THF afforded 3. The complex Cp2Ti{(μ-H)B(C6F5)3} (OEt2) (4) and the proposed 15-electron species Cp2Ti{(μ-H)B(C6F5)3} (5) were generated through the displacement of an ether molecule from 2 by the [HB(C6F5)3]- anion in toluene. Single-crystal X-ray structures of 1, 2, and 3 were determined.
Reactions of bis(pentafluorophenyl)borane with titanocene dialkyls: Synthesis and structure of Cp2Ti[η2-H2B(C6F 5)2]
Chase, Preston A.,Piers, Warren E.,Parvez, Masood
, p. 2040 - 2042 (2008/10/08)
Clean reactions of Cp2TiR2 (R = CH3, CH2-Ph) with HB(C6F5)2 occur when 2.5 equiv of borane are used. The products of the reaction are the Ti(III) complex Cp2Ti[η2-H2B(C6F 5)2], which has been fully characterized, RH, and RB(C6F5)2. A plausible explanation for these observations, which contrast with other reactions of boranes with group 4 metallocenes, is presented.
