Ochem lab- The microscale sodium borohydride reduction of vanillin.? cont.?

Question

Okay how would you get the yield of vanillyl alcohol as a theoretical and a percent yield?

The weight before was 51.362g and after was 51.433g.

Also compare the presence or absence of alcohol and carbonyl stretching frequencies in the IR with respect to the purity of the product.

Answer 1

If the before mass is the tare, then the yield is:

51.433 g - 51.362 g

Check out the site below for a list of both aldehyde and alcohol stretching frequencies. Compare these with you spectrum of the product.

The broad band O–H stretch (hydrogen bonded) at 3500-3200 cm-1 is the biggest difference, but there are others.