Ethanamide See Acetamide

Ethanal. See Acetaldehyde A14-L Ethanaloxime. See Acetaldoxime A16-L Ethanamide. See Acetamide A16-R Ethaneamidine or Ethenylamidine. See u-Amino-o-imidoethane A223-L Ethanoic Acid. See Acetic Acid A25-L Ethanoic Anhydride. See Acetic Anhydride A29-R... 

Ethal TDA-6. See Trideceth-6 Ethal TDA-9. See Trideceth-9 Ethal TDA-12. See Trideceth-12 Ethal TDA-18. See Trideceth-18 Ethal. See Cetyl alcohol Ethana . See1,1,1-Trichloroethane Ethanal. See Acetaldehyde Ethanamide. See Acetamide Ethanamine. See Ethylamine Ethanamine, N,N-diethyl-. See Triethylamine Ethanamine, N-ethyl-N-nitroso-. See N-Nitrosodiethylamine... 

An amide (peptide) bond connects two amino acid residues. The amide unit is quite interesting in that it is essentially planar. Structure 125 shows an amide bond fragment and the electrons are delocalized as shown by the two resonance structm-es, 125A and 125B. This delocalization leads to the C-N unit having partial double-bond character, which is normal for the C-N unit in simple amides such as acetamide (ethanamide see Chapter 16, Section 16.7, and Chapter 20, Section 20.6). This phenomenon is observed in the infrared spectrum of primary and secondary amides, which exhibit two absorptions (1640 cm"i [C-0 stretch] and 1650-1515 cm [imine N-H bend of NH2 or NH] for the amide I and amide II bands see Chapter 14, Section 14.3.4). 

Amides such as 60 are viewed structurally as a combination of an amine and an acid, so there is an amine name and an acid name however, amides are treated differently than esters. For primary amides, an -NH2 group is attached to the carbonyl (two hydrogens on N see 60 Ri=R =H) the name of the acid is changed by replacing the oic acid with the word amide. Two examples in Table 16.3 are butanamide 67 and the ethanoic acid (acetic acid) derivative 68. Amide 67 is a butanoic acid derivative in which OH has been replaced by NH2 and the named is butanamide. The lUPAC name of 68 is ethanamide, but as a derivative of acetic acid, its common name of acetamide is used more often. 

Thus ethanamide can also be found referred to as acetamide, ethanenitrile as acetonitrile, and phenylamine as aniline, for instance. It is worth being aware of this when you see reagent bottles in a laboratory but do not be too disturbed, the IB syllabus and examination papers will use the lUPAC names exclusively and consistently. 

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