lab 4-quiz 2

Question 1

what would be observed if the phase transfer catalyst, tetrabutylammonium bromide, was ommited?

Answer 1

if we dont use it, the base will not go into organic phase and the reaction may not occur.

Question 2

it was essential to stir the reaction vigorously to obtain results. why

Answer 2

we are mixing two phases of the reaction mixture, so that the reaction will proceed.

Question 3

why was it necessary to cool the reaction mixture to room temp prior to extractions?

Answer 3

its an exothermic reaction, the temperature increases. may cause explosion, so we have to cool it. then allow organic and aqueous phase to form, then separate.

Question 4

why was the reaction flask rinsed with diethyl ether

Answer 4

some of the stilbene product is still in the flask, use it to collect it.

Question 5

why was the crude reaction mixture extracted twice, not once, with di water?

Answer 5

to remove the impurities.

Question 6

mechanism

Answer 6

.

Question 7

reagent

Answer 7

benzaldehyde

Question 8

product

Answer 8

cis-stilbene and trans-stilbene