Chemical behaviour of dicyanocob(III)yrinic acid heptamethyl ester and cob(I)yrinic acid heptamethyl ester in some preparative experiments

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Abstract
Preparations of CIO acetate, trifluoroacetate, and chloro derivatives of dicyano-cobyrinic acid heptamethyl ester (‘cobester’) are described. The nature and properties of intermediates in the synthesis of the 10-chloro derivative are discussed, and the electronic absorption spectra of the products are presented.