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- W4300188064 abstract "Chromatography and electrophoresis of the reaction products from B 12s and methyl iodide yield the known Co-methyl-cobalamin and a new light sensitive corrinoid compound. The latter is very probably Co-methyl-cobalamin a with the methyl group “down”. The absorption spectrum of this yellow corrinoid differs only slightly from that of Co-methyl-cobalamin in acid media and does not depend on pH at wavelengths higher than 300 nm. The new corrinoid is thermolabile and on heating at 95°C for several hours in O 2 -free aqueous medium changes nearly quantitatively to Comethyl-cobalamin. The last corrinoid, on the contrary, yields at 95 c C several per cents of Comethyl-cobalamin a. The reaction of B 12s with dimethyl sulfate yields beyond the mentioned products Co-methyl-cobalamin Nm (yellow; the absorption spectrum does not depend on pH and is identical with that of Co-methyl-cobalamin in acid media) and B 12 Nm (both corrinoids have a methyl group on N-3 of the 5,6-dimethylbenzimidazole moiety). The thermal isomerization of both Co-methyl-cobalamins is in accord with the observed formation of Co- 14 CH 3 -cobinamide on heating of Co- 14 CH 3 -cobalamin with Co-CH 3 -cobinamide." @default.
- W4300188064 created "2022-10-03" @default.
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- W4300188064 date "1969-05-01" @default.
- W4300188064 modified "2023-10-10" @default.
- W4300188064 title "Zur Koordinations-Isomerie (a-b-Isomerie) der Co-Alkyl-corrinoide" @default.
- W4300188064 doi "https://doi.org/10.1515/znb-1969-0523" @default.
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