Spectroscopy of Carboxylic Acid Derivatives and Nitriles

All carbonyl-containing compounds have intense IR absorptions in the range I 1650-1850 cm As shown in Table 21.3, the exact position of the absorptioa provides information about the specific kind of carbonyl group. For compari- 

Aliphatic add chloride Aromatjc acid chloride Aliphatic acid anhydride Aliphatic ester Aromatic ester 

Jiphatic amide romatic amide ii-Substituted amide j N-Disubstituted amide [iphatic nitrile omatic nitrile liphatic aldehyde Uipbatic ketone Aliphatic carboxylic add 

Acetyl chloride Benzoyl chloride Acetic anhydride Ethyl acetate Ethyl benzoate 

What kinds of functional groups might compounds have if they show the following IR absorptions  

TABLE 21.3 Infrared Absorptions of Some Carbonyl Compounds and Nitriles 

Carboxylic Acid Derivatives and Nucleophilic Acyl Substitutions 

Problem 21.31 Propose structures for compounds that have the following formulas and 1R absorptioi (a) C3H5N, 2250 cm 1 (b) C HuOa, 1735 cm 1 

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IV. Spectroscopy of carboxylic acid derivatives and nitriles (Section 21.10). 

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