Abstract
The cobalt(III)corrins related to coenzyme B 12 (2, R=5'-deoxyadenosyl) or to vitamin B 12 (1, R=CN) are intensely coloured compounds and are known to undergo two types of light induced reactions: (light induced) loss of an axial ligand or sensitization of reactions with singlet oxygen. The former type of reaction provides an efficient entry to the production of alkyl radicals by the photolysis of the corresponding organometallic B 12-derivatives (such as 2). New developments in the photochemistry of organometallic and other B 12-derivatives are delineated here.
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