Further deductions as to the chemical nature of vitamin B1 from ultra-violet absorption spectra

Abstract

The absorption spectra are interpreted as due to the contained amino-pyrimidine and thiazole nuclei. The pyrimidine component of the vitamin has 1 amino, 1 hydroxyl and 2 methyl (or one ethyl) groups as substituents. Spectrographic evidence suggests that the OH group is not in the 2 position.