Ethyl phenyl ketone, naming

Aromatic ketones are often named by treating the benzene ring as a phenyl group, as in isopropyl phenyl ketone (Fig. 16.12). A few can be named through the lUPAC system in which the framework Ph—C=0 is indicated by the term ophenone and the remainder of the molecule designated by one of the alternative names in Rgure 16.12. Thus, diphenyl ketone is benzophenone, methyl phenyl ketone is acetophenone, ethyl phenyl ketone is propiophenone, and phenyl propyl ketone is butyrophenone (Fig. 16.12). 

Problem 15.47 Give another acceptable name for each of the following (a) dimethyl ketone, (b) l-phenyl-2-butanone, (c) ethyl isopropyl ketone, (d) dibenzyl ketone, (e) vinyl ethyl ketone. ... 

Esters (4.48) have one carbon substituent at the carbonyl and one -OR group. They are formed from acids and alcohols (Figure 4.11), and the name of the ester is a combination of the acid and alcohol names. The name of the alcohol used the form of a substituent, methyl, ethyl, phenyl, etc., and the acid part now takes the suffix -oate, to indicate the ester functionality. Thus 4.49 is methyl propanoate. The most common error that students make in naming esters is that they don t recognize the functional group and try to name them as substituted ketones. If you are finding the nomenclature of these difficult, it s often helpful to separate the ester into the acid and alcohol from which it was made. 4.50 was made from ethanoic (acetic) acid and 1-penta-nol hence, the name is 1-pentyl ethanoate or 1-pentyl acetate. In text, esters may be written as... 

Ans. (a) 3-Methylcyclohexanone. (b) Common names are used for ketones where one (or both) substituent(s) attached to the carbonyl carbon is (are) cyclic (aromatic or nonaromatic) 2-chloro-phenyl ethyl ketone or o-chlorophenyl ethyl ketone, (c) 4-Methyl-2-heptanone. (d) 2-Chloro-cyclohexanecarbaldehyde. 

Photolytic decomposition of peroxides is not v y efBcient in crosslinking. An enhancement effect on the extent of photocrosslinking of polyolefins in the presence of peroxides is displayed by aromatic hydrocarbons such as naphthalene. These transfer the exdtation energy absorbed to a peroxide. This procedure, however, does not represent an important improvement when compared with that refored to earlier, namely the photoreduction of pdyethylene with aromatic ketones and quinones [84. From aromatic ketones and quinones, particulariy bena>phenone [32], chlorinated benzophenones, benzoyl-l-( dohexanol [82], a, -dimethot - hen acdr henone, 2,4,6-trimethyl benzoyl phenyl phosphinic ethyl ester [85], anthrone [86], anthraqui-none [87], naphthoquinone, benzoquinone, and their d vatives have all been examined. 

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