Oxidation of zeaxanthin. Isolation and properties of 3-hydroxyretinene

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Abstract
Anthers of Delonix regia flowers are a rich source of zeaxanthin. Oxidation of zeaxanthin with H2O2 in the presence of OSO4 results in the ormation of 3-hydroxyretinene as one of the products. 3-Hydroxyretinene gives 3-acetoxyretinene with acetic anhydride, and an oxime with hydroxylamine hydrochloride. Reduction of 3-hydroxyretinene with NaBH4 yields 3-hydroxyvitamin A. Treatment of 3-hydroxy-vitamin A with dry ethanolic HC1 results in the formation of 3-ethoxy-anhydrovitamin A (anhydrovitamin A2) and a compound that resembles naturally occurring anhydrovitamin A2.