5. Consider the following reactions in transition metal organometalic complexes: 1. B-hydride elimination of 1-butene fr

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5 Consider The Following Reactions In Transition Metal Organometalic Complexes 1 B Hydride Elimination Of 1 Butene Fr 1 (56.74 KiB) Viewed 11 times

5. Consider the following reactions in transition metal organometalic complexes: 1. 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)2E01 iv. Reductive elimination of isobutane from Cr('pr)Me(n+CH)(PPh3)} 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 (ii) rather than an oxidative addition process. [2 marks] e. Provide the number of valence electrons, coordination number oxidation state and 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]