Meeting 8 Problem Set

Final Exam: August 3, 2004 at 11-1 pm in Math4000A. Only pen, ruler and non-graphing calculator allowed.

Lab notebooks: due after the final exam. Make sure to staple or paste all your spectra in. Also include a table of content.

Instructor's review session: August 2, 2004, 4-6 pm, Boelter Hall 5249

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. Why is it important that the glassware used in the experiment is dry?

2. This quarter the lab support provides a 1.4 M solution of MeMgBr in toluene/THF. How many mL would you need of this solution in order to have the same number of moles of Grignard present in the reaction mixture as asked for in the reader?

3. During the work-up, a student is asked to add 10% sulfuric acid to the reaction mixture.

a. What is the function of this step?

b. Which precautions have to be taken in this step?

4. Why are ethers most often used as solvents for Grignard reagents?

5. Referring to the recrystallization of the crude product, answer the following questions.

a. the procedure ask you not to place the solution in an ice-bath. Why?

b. a student uses low-boiling petroleum ether as solvent. What would he observe?

6. Why do you get preferentially one product in this reaction?