. Carotenoids, their comparative biochemistry. Carotenoids. 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
. Carotenoids, their comparative biochemistry. Carotenoids. 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. CH3 CH3 â CH=CH-C-GH2-CH=CH-C-CH2-CH = CH-CH2'-C-CH»CH-CH2-C-CH=CH ( ^CH, CH3 OH CHj OH OH HjO CHj CH3' CHj CH, cHj yy â¢CH» = CH-CH=CH-CH = C-CH = CH-CH=C-CH = CHâ{\ ^CHj CHjA/. 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.
Size: 1327px × 1883px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
