. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS IN LAND PLANTS P-carotene varies from species to species but usually falls within the range 200-700 dry weight. The carotene content of the leaves of a large number of plant species has been collected in an appendix (see p. 289). There is one report that p-carotene exists in timber (Acacia acuminata). ^ ** The structure of p-carotene, which was finally elucidated by Karrer and his colleagues,* is : Me -Me .^AAAy' Me Me p-carotene. It is fitting to note here that Karrer ^^"^^ has crowned 20 years' work on carot
. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS IN LAND PLANTS P-carotene varies from species to species but usually falls within the range 200-700 dry weight. The carotene content of the leaves of a large number of plant species has been collected in an appendix (see p. 289). There is one report that p-carotene exists in timber (Acacia acuminata). ^ ** The structure of p-carotene, which was finally elucidated by Karrer and his colleagues,* is : Me -Me .^AAAy' Me Me p-carotene. It is fitting to note here that Karrer ^^"^^ has crowned 20 years' work on carotenoid chemistry by achieving a total synthesis of p- carotene and lycopene (see p. 25), albeit in small yield. As this work was reported after the publication of Karrer and Jucker's monograph, the essential steps in the synthesis are included here, using p-carotene as an example. CHj CH3 CHj CH3 CH=CH-t-CH2-CHCH + 4E + Mg8r OH CH3 CH, CHj CH, CH3 CHj â CH = CH-^C-CH2-C5CMgBr H- CCHj CH = + Mg Br CsC-CH2-C-CH=CH- XH, CH3 CH. OMgBr CHj CH3 CHi CH, CH=CH-C-CH2-C = = OH OH ^CH3 CH3 CH3 CHj CH3. 6h. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Goodwin, T. W. (Trevor Walworth). New York, Chemical Pub. Co.
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