Carotenoids and related compounds. Part XXXII. Synthesis of astaxanthin, phoenicoxanthin, hydroxyechinenone, and the corresponding diosphenols

…, JB Davis, AP Leftwick, C Price, BCL Weedon

Index: Cooper; Davis; Leftwick; Price; Weedon Journal of the Chemical Society. Perkin transactions 1, 1975 , # 21 p. 2195 - 2204

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Citation Number: 16

Abstract

Autoxidation of 4-oxo-carotenoids in the presence of potassium t-butoxide gives the corresponding diosphenols (3, 4-didehydro-3-hydroxy-4-ones). These on reduction with potassium borohydride give the 3, 4-dihydroxycompounds which, on carefully controlled oxidation, yield the 3-hydroxy-4-ones. Astaxanthin (3, 3′-dihydroxy-ββ-carotene-4, 4′- dione), phoenicoxanthin (3-hydroxy-β, β-carotene-4, 4′-dione), and hydroxyechinenone ...