Aromatic Compounds and EAS

by Adam Le Gresley, PhD

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    Right. Okay. So, let’s talk about aromatic ring systems. Now, ostensibly they may look like alkanes; they all contain carbon and hydrogen. But, if we take a look, for example, at the first molecule, benzene, C6H6, you can see that we actually have three double bonds inside. And what we are going to cover in this lecture is what that means in terms of the reactivity of the species and also some of its other properties. Benzene derivatives are often shown as the second drawing in the board slide section that you can see here where we have an R group substituting on a benzene ring, where R can either be alkyl or indeed, it can be X, a heteroatom. I have also drawn naphthalene and antracene which contain two aromatic rings and three aromatic rings respectively. I have only restricted myself to these three as relatively simple examples. But, you can increase the number of rings and then you start using… looking at large polyaromatic compounds like pi rings. These aromatic hydrocarbons, as opposed to the aliphatic ones that we have covered before ,such as cyclohexyl, cyclopentyl groups, are also known as arenes and are all derivatives of that single benzene ring system. In general, aromatic groups can be called aryl groups and are often abbreviated with the letter Ar standing for aryl which means benzene or a related family member. So, let’s have a quick look at nomenclature before we actually start looking at the molecular orbitals and how they distinctly influence the reactivity of the benzene ring and make it quite so different from a conventional alkene or indeed, an alkane. Here we have a look at the first example which is ethylbenzene. This is where we have monosubstitution. So, we have a single substituent on the...

    About the Lecture

    The lecture Aromatic Compounds and EAS by Adam Le Gresley, PhD is from the course Organic Chemistry. It contains the following chapters:

    • Aromatic compounds and EAS
    • Biologically relevant examples of aromatic compounds
    • Benzene
    • Aromatic compounds
    • Electrophilic Aromatic Substitution

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    Author of lecture Aromatic Compounds and EAS

     Adam Le Gresley, PhD

    Adam Le Gresley, PhD

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