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Several natural corrinoids, cobalamin, 5-hydroxybenzimidazolyl cobamide (factor III), adenyl cobam ide (pseudovitam in B12), 2-methyladenyl cobamide (factor A) and cobyric acid, were reduced with sodium borohydride. The reduction of cyanocobalam in is slow as compared with that of factor III and especially of the other corrinoids under study. At longer wavelengths (λ > 300 nm) the electronic spectra of the Co(I)-corrinoids are nearly identical. The same is to say about the CD-spectra of the Co(I)-corrinoids examined.doi:10.1515/znc-1979-9-1006 fatcat:4kk7mpg7ijfzziwyv7lw73zilu