Abstract
In the following reactions are discussed which use UV or visible light and a metal salt or a transition metal complex, in general in less than stoichiometric quantity, to effect an organic substrate transformation. The cases presented are a selection which is intended to illustrate the possibilities — also pitfalls — of this type of photocatalysis. An overview in tabular form can be found in ref. [1]. Not considered is organic photochemistry sensitized by Hg [2] and reactions coupled to excitation of semiconductors. No consideration is given to phototransformations which effect only a change in the metal complex [3] and of the many catalytic reaction cycles which are initiated by ligand loss from a transition metal carbonyl, olefin, alkyl or hydride complex [4]. Informative and timely reviews are available on this topic.
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