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23. Consider both regioselectivity and stereosclectivity to predict the products for the eliminations below, and draw complete mechanisms. (6 pts)

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第二大題:問答題(共55分) Part II: Questions and Answers (Please provide an adequate answer to each of the following questions; Total 55 points) 21. Provide a mechanism for the following transformation. Please show all arrow pushing. (6 pts)

22. Provide a synthesis that will selectively convert S to T. Show all of the key intermediates and furnish all of the important reagents. Hint: This is not a one-step process. (8 pts)

24. What are the advantages and disadvantages of the following bonding theory? (Please use specific examples to support your answers) (10 pts) (a) VSEPR Theory, (b) Valence Bond Theory, (c) Molecular Orbital Theory

25. Explain the following terms (Total 10 pts; 2 pts each): (a) turnover frequency, (b) turnover number, (c) selectivity, (d) catalyst, and (e) catalytic cycle

(a) What would you call this reaction? (1 pt)

(b) What is the d-orbital splitting diagram of complex a and complex b. (Please label each orbital) (2 pts)

(c) Provide a detailed description of the electronic structures of complex b? (You should include oxidation state, number of unpaired electrons and spin state, ctc.) (2 pts)

(d) What characterization technique(s) would you use to prove your assignment about the electronic structure of complex b in question (c). (Please include a detailed explanation in your answer) (10 pts)

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