Naturally occurring anhydrovitamin A2. Transformation into retinene2

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Abstract
''Naturally occurring anhydrovitamin A2'' obtained from the liver oil of freshwater fish Bagarius bagarius yielded, after 6-stage chromatogranhy, a pure product showing characteristic bands at 350, 368 (E1%1cm. 1006) and 390 m[mu] in ethanol, and producing a green color with antimony trichloride (E1%1cm. 1884 and 693 m[mu]). On distribution of the material between lignt ''petroleum and 95% methanol, 70% of it is found in methanol, which points to its hydroxylic character. It gives an acetyl derivative, from which the original hydroxy compound can be regenerated on hydrolysis. The infrared spectrum shows, besides other bands, one at 3460 cm.-1 attributable to a hydroxy group. On passing a light-petroleum solution of naturally occurring anhydrovitamin A2 throuth manganes dioxide at 6% conversion into retinene2 is observed. A 3-hydroxyanhydroretinol structure is proposed for naturally occurring anhydrovitamin A 2 and a mechanism of its transformation into retinene2 on this basis is suggested.

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