By George Britton
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Additional info for Carotenoid Chemistry and Biochemistry. Proceedings of the 6th International Symposium on Carotenoids, Liverpool, UK, 26–31 July 1981
S. M. Dent, London (1971). 75. A. Wyatt, The Rose Annual 1975, 38. 76. S. Terashima, M. C. Tseng and K. Koga, Tetrahedron Letters 1978, 1763. 27 RECENT ADVANCES IN THE SYNTHESIS AND ANALYSIS OF 3,4-OXYGENATED XANTHOPHYLLS Robert K. Müller, Kurt Bernhard and Max Vecchi* Department of Vitamin and Nutritional Research and Central Research Units*, F. , CH-4002 Basle, Switzerland Abstract - The progress made within the last three years in the syn thesis and analysis of astaxanthin and of other related 3,4-oxygenated xanthophylls is reviewed.
These were smoothly transformed into the acetoxy bromide _14^ by acetylation followed by reaction of the intermediate secondary acetates with hydrobromic acid. In this case, acetylation proved to be very important. Without acetylation, only -destruction of Ì3_ was observed. Subsequent treatment of 1^4 with triphenyl phosphine afforded the phosphonium bromide L5 which was immediately converted into the corresponding crystalline chloride _^6 by treatment with aqueous sodium chloride. The synthesis of the C -carbon skeleton was achieved according to the scheme C + C =C (Fig.
H. Williams, Chem. Commun. 197 9, 54 5. 26 C. H. EUGSTER 60. M. Clough and G. Pattenden, Chem. Commun. 197 9, 616. 61. G. Toth, J. Kajtar, P. Molnar and J. Szabolcs, Acta Chim. Acad. Sci. Hung. 97, 359 (1978). 62. W. Vetter, G. Englert, N. Rigassi and U. Schwieter, "Carotenoids" (éd. by 0. Isler, H. Gutmann and U. Solms), Birkhäuser, Basel (1971). 63. H. Pfander, A. Lachenmeier and M. Hadorn, Helv. Chim. Acta 63, 1377 (1980). 64. C. G. Andrewes, G. Borch and S. Liaaen-Jensen, Phytochem. 17, 2037 (1978).
Carotenoid Chemistry and Biochemistry. Proceedings of the 6th International Symposium on Carotenoids, Liverpool, UK, 26–31 July 1981 by George Britton