Abstract
Two photolytic products of vitamin K_1,which had the same Rf values (0.36) on a thinlayer of Kiesel gel G using chloloform as solvent system but had different Rf values in a n-butyl ether・petroleum ether system, were isolated from the degradation products by chromatographic techniques. These substances were elucidated as 2-methyl-3-(3', 7', 11', 15'-tetramethyl-1'-hexadecenyl)-1,4-naphthoquinone-hydroperoxide-(3') and 2-methyl-3-(3', 7', 11', 15'-tetramethyl-1'-hexadecenyl)-1,4-naphthoquinone-hydroxide-(3').
