5 Consider The Following Reactions In Transition Metal Organometallic Complexes I B Hydride Elimination Of 1 Butene Fr 1 (56.75 KiB) Viewed 18 times
5 Consider The Following Reactions In Transition Metal Organometallic Complexes I B Hydride Elimination Of 1 Butene Fr 2 (56.75 KiB) Viewed 18 times
5 Consider The Following Reactions In Transition Metal Organometallic Complexes I B Hydride Elimination Of 1 Butene Fr 3 (45.49 KiB) Viewed 18 times
5 Consider The Following Reactions In Transition Metal Organometallic Complexes I B Hydride Elimination Of 1 Butene Fr 4 (45.49 KiB) Viewed 18 times
5. Consider the following reactions in transition metal organometallic complexes: i B-hydride elimination of 1-butene from [Fe(n-cp)("Bu)(PH3)2]. ii. Oxidative addition of methane to [PICH(PPh:) ii. Production of propane via o-bond metathesis between methane and Sc(n-cp).Et iv. Reductive elimination of isobutane from Cr(pr)Meln-CH. (PPh:)2]. V. Transmetallation between [Pd(C.HS)Br(PPh:)?] and ZnCiMe. N.B. cp = cyclopentadienyl, CsHs a. Draw the complexes shown in bold as well as the transition metal- containing products of reactions i - v. Ligands other than phosphines must be drawn in full showing correct connectivity to the metal centre. Unless otherwise stated, assume the charge on the complex remains unchanged during each reaction. [10 marks, each part carries equal marks] b. Suggest a modification to the complex in reaction (1) that could prevent this B-hydride elimination process, briefly explaining your reasoning [2 marks] c. Draw the mechanism of oxidative addition shown in reaction () including all intermediates and transition states. [2 marks] d. Explain why the o-bond metathesis reaction occurs in reaction (li) rather than an oxidative addition process. [2 marks] e. Provide the number of valence electrons, coordination number, oxidation state and d-configuration for the Cr-containing starting material and product of reaction (iv). [2 marks] f. Draw the transition state involved in the transmetallation process shown in reaction (v), clearly indicating which bonds are forming and which are breaking [2 marks]
5. Consider the following reactions in transition metal organometallic complexes: i. B-hydride elimination of 1-butene from [Fe(n®-cp)("Bu)(PH3)2]. ii. Oxidative addition of methane to [PtCl3(PPh:)] ii. Production of propane via o-bond metathesis between methane and [Sc(n-cp)2Et]. iv. Reductive elimination of isobutane from Cr('pr)Me(n-C.H.)(PPh3)2). V. Transmetallation between [Pd(C6H5)Br(PPha)2] and ZnClMe. N.B. cp = cyclopentadienyl, CsHs a. Draw the complexes shown in bold as well as the transition metal- containing products of reactions i - v. Ligands other than phosphines i must be drawn in full showing correct connectivity to the metal centre. Unless otherwise stated, assume the charge on the complex remains unchanged during each reaction. [10 marks, each part carries equal marks)
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