1. What is the purpose of ethereal solvents in Grignard reactions? a) increase k

ID: 1031055 • Letter: 1

Question

1. What is the purpose of ethereal solvents in Grignard reactions?

a) increase kinetics

b) stabilize R-Mg-X complex

c) catalytically involved in the mechanism

d) reduce toxicity

e) provides a proton sponge

f) destroys contaminants

2. In lab, it was important to exclude _____ and air due to hydrolysis and ______.

a) dust; ortho-substitution

b) salts; racemization

c) clays; clumping

d) dihydrogen oxide; oxidation

3. What solvent system would be the best first step to aid in separating methacrylic acid from a newly synthesized N-cinnamoyl tryptamine?

a) benzene / sat. aq. carbonate

b) brine / MgSO4

c) dichloromethane / mineral oil

d) isopropyl alcohol / H2O

e) sand / clay

1. What is the purpose of ethereal solvents in Grignard reactions?

Answer : (B)

Explanation : Ether is used as a solvent because it is aprotic and can solvate the magnesium ion.

2. In lab, it was important to exclude _____ and air due to hydrolysis and ______.

Answer : (D) dihydrogen oxide; oxidation

3. What solvent system would be the best first step to aid in separating methacrylic acid from a newly synthesized N-cinnamoyl tryptamine?

Answer : (C) dichloromethane / mineral oil

Explanation : Because they are polar protic solvent and Grignard reagent is stable in polar protic solvent.

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