ATTN: Answers to the below questions are due at the start of your lab period; these answers should be part of your pre-lab write-up.

1. Referring to the synthesis and characterization of the Jacobsen catalyst, answer the following questions.

a. Why is a slow air stream passed through the reaction mixture? Sketch a setup of the reaction.

b. Why is heptane used during the work-up of the catalyst? Would pentane work as well here?

c. Where do you expect to observe the C=N-stretching frequency for the ligand and the catalyst? Rationalize the differences.

d. What is the function of the LiCl in this reaction?

2. The following questions refer to the catalyst design.

a. Why are there two tert. butyl groups attached to the benzene ring?

b. Why is manganese used as a central atom and not magnesium?

c. Which oxidation state does the Mn-atom have in the neutral complex?

d. Why is (R,R)-diaminocyclohexane used in the catalyst?