Synthesis of Less Stable Carotenoid Sulphates

The less stable carotenoid sulphates are those which upon storage in methanol or water are partly converted into less polar solvolysis products [11]. 

Secondary a-glycols (end group j), tertiary carotenols (end group k) and phenolic (end group 1) carotenoids form such less stable sulphates. 

Sulphates of caloxanthin (182), nostoxanthin (196), rhodovibrin (167), l,2,r,2 -tetra-hydrolycopene-l,l -diol (169), r,2 -dihydro-(l), /-caroten-r-ol (88), 3-hydroxyisorenieratene (87) and 3,3 -dihydroxyisorenieratene (161) have been prepared. 

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