After the desired amide has been purified, the question is: Is it really the ami
ID: 962153 • Letter: A
Question
After the desired amide has been purified, the question is: Is it really the amide? And how pure is it? • Which method can be used to answer this? IR is very useful in this case. • Why is IR so useful in this case? Carbonyl peaks for the amide, acid chloride and carboxylic acid are easily differentiated. Look up the IR absorptions for these different functionalities. • After an IR spectrum is recorded, analyze it carefully and determine whether the product is pure.
QUESTION:
The three carbonyl compounds in this reaction sequence are easily distinguished by IR spectroscopy because:
Question 6 options:
The substitution of the aromatic ring is different.
They have different fingerprint regions
Some are solids, some are liquids and this will be apparent when preparing a sample for IR analysis.
Each has its C=O strech absorption in a distinctly different region.
The acid has a big OH absorption.
The substitution of the aromatic ring is different.
They have different fingerprint regions
Some are solids, some are liquids and this will be apparent when preparing a sample for IR analysis.
Each has its C=O strech absorption in a distinctly different region.
The acid has a big OH absorption.
Explanation / Answer
Each has its C=O strech absorption in a distinctly different region.
A sharp absorption peak for amides, C=O at 1700-1630 cm^-1