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Extra info for The Chemistry of Natural Products: 6. Plenary Lectures Presented at the Sixth International Symposium on the Chemistry of Natural Products

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By H. K. Airy Shaw). A Dictionary of the Flowering Plants and Ferns, 1th edition, Cambridge University Press, 1966. In the 6th edition (1951) the genus is said to consist of 280 species. 2 Many more santonin-containing species are recorded in the literature, but many of these have recently been reduced by synonymy. 3 Sesquiterpene lactones of the class under discussion here have been isolated only from two other plant families, the Magnoliaceae and the Umbelliferae, in neither of which have they yet been found to be of wide and general occurrence.

Uehlinger. Helv. Chim. Ada 35, 2034 (1952); P. M. Boll and H. A. Lillevik. Acta Chem. Scand. 13, 2039 (1959). 42 K. Schreiber and H. Ripperger. Experientia 16, 536 (1960); Tetrahedron Letters 9, (1960); Liebigs Ann. Chem. 655, 114 (1962); Z. Naturforsch. 17b, 217 (1962). 43 Y. Sato, H. G. , and E. Mosettig. / . Org. Chem. 22, 1496 (1957). 44 cf. K. Schreiber and H. Ripperger. Chem. Ber. 96, 3094 (1963). 45 H. Ripperger and K. Schreiber. Liebigs Ann. Chem. 723, 159 (1969). 4β Y. Mazur, N. Danieli, and F.

36 Figure 5. Santanolides of section Abrotanum A. bigelovii is regarded as a member of the section Abrotanum by Ward 6 and by Hall and Clements30, but is placed in a group of Seriphidium species classed as the section Tridentatae Rydb. by Beetle31. Again, the wide structural diversity found in the compounds of the sections Abrotanum and Seriphidium (and, indeed, in that section of the latter set apart as the Tridentatae—see below) provides no common point of reference from which to seek a relationship between section classification and chemical structure.

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