this chapter and the next we extend our coverage of conjugated systems to include arenes. Arenes are hydrocarbons based on the benzene ring as a structural unit. Ben- are zene, toluene, and naphthalene, for example, are arenes
N ow that we're familiar with the structure and preparation of alkenes, let's look at their chemical reactions. The characteristic reaction of alkenes is addition to the double bond according to the general equation:
the preceding chapter the special stability of benzene was described, along with reac- tions in which an aromatic ring was present as a substituent. In the present chapter we move from considering the aromatic ring as a substituent to studying it as a functional
ACYL SUBSTITUTION his chapter differs from preceding ones in that it deals with several related classes of compounds rather than just one. Included are 1. Acyl chlorides, RCCI 2. Carboxylic acid anhydrides, RCOCR 3. Esters of carboxylic acids, RCOR'99
