Über einen synthetischen Antisterilitätsfaktor.- 5. Mitteilung über Antisterilitätsfaktoren (Vitamin E).

The Chemistry of Vitamin E.

“…With one exception, the p-quinones studied are all inactive. These include duroquinone (36,65), tetraethylquinone (toxic) (37), thymoquinone (toxic) (37), trimethylethylquinone (37), 1,4-naphthoquinone (140), 1,2-naphthoquinone (toxic) (37), 2,3-dimethyl-l,4-naphthoquinone (37,140), 2-methy 1-1,4-naphthoquinone (37), 2-hydroxy-l ,4-naphthoquinone (37), 2-methoxy-l ,4-naphthoquinone (37), anthraquinone (37), and /3-methylanthraquinone (37). The one exception to the inactive p-quinones is -tocopherylquinone (X), obtained by mild oxidation of -tocopherol, and the results of different workers who have tested this substance do not agree.…”

“…Durohydroquinone is active (65, 68), while trimethylethylhydroquinone and trimethyl-5-acetohydroquinone are inactive (138, 140). The only naphthohydroquinone tested is 2,3-dimethyl-5,6,7,8-tetrahydro-l,4naphthohydroquinone; this compound exhibits good activity (139), as does its mono-n-dodecyl ether (65).…”