Aromatic Chemistry (Basic Concepts In Chemistry) by John D. Hepworth

By John D. Hepworth

This booklet presents an updated and complete account of fragrant chemistry. a sequence of chapters describes the synthesis and reactions of the main practical derivatives of benzene and the extra universal polycyclic platforms. The ideas of aromaticity and the mechanism of fragrant substitution are mentioned, as is using metals within the synthesis of fragrant compounds. all through, emphasis is put on mechanisms. labored difficulties and questions are supplied to help realizing.

In addition to supplying fabric required through an undergraduate learning chemistry, Aromatic Chemistry is usually perfect for business chemists trying to replace their wisdom of this significant point of chemistry.

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As discussed in Chapters 2 and 9, only aryl halides that are activated by electron-withdrawing groups are susceptible to nucleophilic substitution, when even water and aqueous sodium hydroxide can be effective reagents. A hydroxyl group can also be introduced by conversion of the aryl halide into a Grignard reagent or an aryllithium compound and subsequent reaction with oxygen or through the intermediacy of the boronic acid (see Chapter 10). 3 From Amino Compounds The amine is converted into a diazonium salt which is then warmed with water (see Chapter 8).

14. These products readily lose water to form quinomethanes (methylenecyclohexadienones), which react with more phenoxide. g. Bakelite) in which the aromatic rings are linked to methylene bridges. Reaction of 2,4,5-trichlorophenol (the antiseptic TCP) with HCHO yields hexachlorophene, a widely used germicide. 14 The dihydroxybenzenes or dihydric phenols 15-17 have trivial names as shown. 15). 2). 1,3-Dihydroxybenzene is prepared industrially by the alkali fusion of benzene- 1,3-disulfonic acid.

Octane gives rise to the three isomers of xylene and to ethylbenzene. Since more toluene than benzene is produced in the process, a quantity of toluene is converted into benzene by . High temperature (650-680 " C ) of longer chain alkanes, a process that breaks them down into smaller alkanes, is also a source of aromatic compounds. 3. I Friedel-Crafts Reaction The most important means of introducing an alkyl group into an . 1). 1 A wide range of reactants, catalysts, solvents and reaction conditions can be used, making the Friedel-Crafts reaction a very valuable and versatile process.

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