ABSTRACT
Examination of the structures of several of the CSC components indicates that the decision of their categorization is somewhat difficult. In Figure XIV-IA, representative structures for an amide, an imide, and a lactam are presented. To which of these categories-amide, imide, or lactam-should the smoke component 1-acetyl-3-ethyl-1,5-dihydro-4-methyl2H-pyrrol-2-one {I} be assigned? Its structure is depicted in Figure XIV-IB. In Structure {II} of Figure XIV.B, the amide configuration is shown. Structures {III} and {IV} show the imide and lactam configurations, respectively. This same situation is present with several other smoke components. Although there may be some disagreement on the preciseness of our selection, for completeness sake such components are listed in each chapter in its major catalog table. As a result, the total number of components in each of the major catalog tables may be slightly inflated.
