Consider the following reaction (DPPE structure below): F. - B(OH)2 F Ni(OTf)2 DPPE K2CO3 (a) Give the product of the reaction and suggest a plausible catalytic cycle giving the number of d-electrons and the oxidation state of Ni in each intermediate.

3. a. (i) Starting from K₂[PtC14], plan synthetic routes to the two complexes A and B shown below, using your knowledge of the trans effect. Formulate each step by drawing structures of each complex and give a full explanation for your choices. Make sure to assign the correct charges to each complex in each case. 7- 7- (ii) NCS NH₂ -Pt-Br CI NO₂ CI-Pt-OH CO B Write a detailed discussion of the two factors that may contribute to the overall trans-directing ability of a particular ligand, considering thermodynamic and kinetic aspects. Use appropriate examples and orbital sketches to support your explanations.

Show Calculations and Formulas. What is the energetic favorability of A? (A) MnO2 reduction by sulfide yielding S0 Compared to the energetic favorability of B? (B) energetic favorability of MnO2 reduction by sulfide yielding SO42-.

Consider the reaction between dissolved Fe2+ and elemental sulfur (S0) to form hematite (Fe2O3) and sulfide a) Identify the oxidant and reductant in this reaction, determine half-reactions, and balance thereaction. b) Is this reaction thermodynamically favorable? c) Would you expect HS- to react readily with Fe2O3 (i.e. the reverse of the reaction)?

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