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Issue 11, 2012
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Photochemical reactions of aromatic compounds and the concept of the photon as a traceless reagent

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Abstract

Electronic excitation significantly changes the reactivity of chemical compounds. Compared to ground state reactions, photochemical reactions considerably enlarge the application spectrum of a particular functional group in organic synthesis. Multistep syntheses may be simplified and perspectives for target oriented synthesis (TOS) and diversity oriented synthesis (DOS) are developed. New compound families become available or may be obtained more easily. In contrast to common chemical reagents, photons don't generate side products resulting from the transformation of a chemical reagent. Therefore, they are considered as a traceless reagent. Consequently, photochemical reactions play a central role in the methodology of sustainable chemistry. This aspect has been recognized since the beginning of the 20th century. As with many other photochemical transformations, photochemical reactions of aromatic, benzene-like compounds illustrate well the advantages in this context. Photochemical cycloadditions of aromatic compounds have been investigated for a long time. Currently, they are applied in various fields of organic synthesis. They are also studied in supramolecular structures. The phenomena of reactivity and stereoselectivity are investigated. During recent years, photochemical electron transfer mediated reactions are particularly focused. Such transformations have likewise been performed with aromatic compounds. Reactivity and selectivity as well as application to organic synthesis are studied.

Graphical abstract: Photochemical reactions of aromatic compounds and the concept of the photon as a traceless reagent

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Publication details

The article was received on 22 Mar 2012, accepted on 23 May 2012 and first published on 25 May 2012


Article type: Perspective
DOI: 10.1039/C2PP25074H
Photochem. Photobiol. Sci., 2012,11, 1613-1641

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    Photochemical reactions of aromatic compounds and the concept of the photon as a traceless reagent

    N. Hoffmann, Photochem. Photobiol. Sci., 2012, 11, 1613
    DOI: 10.1039/C2PP25074H

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