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- W4249889330 abstract "1.1. When cyanocobalamin or 8-aminocobyrinic acid-c-lactam were heated in 30% NaOH at 120° for 1 h, a green substance was formed whose spectrum was similar to that of vitamin B12s, and this substance readily reacted with emtyyl iodide to yield cobalt-methyl-8-aminocobyrinic acid-c-lactam as the main product.2.2. Cyanocobalamin heated anaerobically in 0.4% NaOH at 100° for 10 min gave a yellow-brown substance whose spectrum ws similar to that of vitamine B12r, and this substance reacted with methyl iodide of n-butyl bromide to yield cobalt-methyl or cobalt-n-butyl derivatives of dehydrocobalamin, respectively, and their mono- to tricarboxylic acid derivatives.3.3. On being heated anaerobically in 0.4% NaOH, cyanocobalamin and aquo(or hydroxo)-cobalamin rapidlyturned yellow-brow, while cyanodehydrocobalamin and aquo(or hydroxo)-dehydrocobalamin changed only verly slowly.From these facts it seems probable that the occurrence of the yellow-brown state with the behaviour of vitamin B12r may be due to the reduction of the cobalt atom accompanied by dehydrogenation on the B ring of the corrin nucleus.4.4. The formation of the green substance from 8-aminocobyrinic acid-c-lactam on vigorous alkali treatment is, however, interpreted by assuming another reaction mechanism causing further reduction of the cobalt atom." @default.
- W4249889330 created "2022-05-12" @default.
- W4249889330 date "1958-08-01" @default.
- W4249889330 modified "2023-10-14" @default.
- W4249889330 title "P/276. The irradiation of pharmaceutical products" @default.
- W4249889330 doi "https://doi.org/10.1016/0020-708x(58)90104-2" @default.
- W4249889330 hasPublicationYear "1958" @default.
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