This article describes the synthesis of novel derivatives of indigo and porphyrin, the structure and the function of which are of interest from photochemical and bioorganometallic points of view : (1)
N-Substituted indigos undergo
trans-cis isomerization and one- or two-electron reduction upon irradiation with visible light. The kinetic and thermodynamic profiles of these processes are greatly dependent on the nature of
N-substituents. (2) Metal-carbon (or hydrogen) bond formation was demonstrated by using mono-, di-, and tri-valent rhodium porphyrins as mimics of reaction behaviors of Coenzyme B
12. Novel organocobalt porphyrins such as π-complex, N, Co-bridged complex, and C
meso, Co-bridged complex were obtained by the reactions of trivalent cobalt porphyrins with alkynes. (3) Organometallic porphyrins were converted into the
N-substituted porphyrins which have recently turned out to be abnormal metabolites of cytochrome P 450, and into N (21), N (22) -bridged porphyrins which show interesting redox activities.
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