CAROTENOIDS IN LAND PLANTS 



scholtzia calif ornica by Strain ^so j^^g recently been investigated by 

 Karrer and Leumann. ^ ^ °^ They showed that it is probably 3 : 3'- 

 dihydroxydehydro-p^rotene : 



Me Me M« 



HO 



<QAAAAA/yV/v/ I 



Me 



Eschscholtzxanthin 



When treated with chloroform containing traces of hydrogen 

 chloride it loses two molecules of water to form anhydroeschscholtz- 

 xanthin (absorption maxima 578,539,503 mfji in CS, : 531 and 500 mfx 

 in light petroleum.) 



An hy d roeschscholtzanth i n 



Petaloxanthin (C4oH5eor seOa) from Cucurhita pepo^^^ tara- 

 xanthin (C4oH6e04) from Taraxacum offidnaUy Impatiens noli me 

 tangercy ^ « » Tussilago farfara, ^ ' « Tragopogon pratensis, and R. acris, * ' ^ 

 are both of unknown structure. Gazaniaxanthin isolated from G. rigens 

 is probably a dihydrorubixanthin. ^ ' i Four new carotenoids isolated 



? Gazaniaxanthin 



by Karrer and his associates are epoxides, three of them 5 : 8-epoxides : 

 auroxanthiriy 5:8, 5' : S'-diepoxyzeaxanthin (C40H66O4), from Viola 

 tricolor ; ^ ' » chrysanthemaxanthin, 5 : 8-epoxy-3 : 3'-dihydroxy-a-. 

 carotene (C4oH6e03) from Chrysanthemum spp., 2«' Tragopogon 

 pratensis, R. acris ^ ' ^ and Cytisus scoparius ; * • ' rubichrome, 5 : 8- 

 epoxy-3-hydroxy-Y-carotene (C40H66O2) from Tagetes patula^^^ and 



47 



