Abstract

AbstractThe new derivatives 7a–c, of vitamin B12, with a peripheral tris(oxyethylene) chain linked to the corrin ring by an amide or ester group, are prepared, and their ligand‐exchange reactions are investigated. Upon reduction of the aqua‐cyano complexes 8a–c with NaBH4, cleavage of the ‘outer’ ester and amide group is observed.

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