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Extra resources 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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Soc. 7 3 , 880 ( 1 9 5 1 ) ; 74, 5 3 8 ( 1 9 5 2 ) ; cf. R . K u h n , I . L o w , a n d H . T r i s c h m a n n . Chem. Ber. 8 5 , 416 (1952). 21 cf. K . Schreiber, G . A d a m , O . A u r i c h , C. H o r s t m a n n , H . R i p p e r g e r , a n d H . R ö n s c h . Proceedings of the Second International Congress on Hormonal Steroids, Milan, May 23-28, 1966. E x c e r p t a M e d i c a F o u n d a t i o n , A m s t e r d a m , N e w York, L o n d o n , M i l a n , T o k y o , B u e n o s Aires (1967) p .

A. turanica Krasch. Figure 6. juncea) these are santanolides {Figure 7)39. , CH—CH3 at C-11, 13). Santanolides are not, however, confined to the santonin-containing species. Compounds of this class that have been isolated from other Seriphidium species are shown in Figure 8. Species of the section Seriphidium that lack santonin, although not lacking in santanolides (see Figure 8), appear to be more typically characterized by the presence of guaianolides {Figure 9). A. tridentata (both species studied), A.

Tomko. Tetrahedron 24, 4875 (1968). 41 G. Barger and H. L. Fraenkel-Conrat. / . Chem. Soc. 1537 (1936); H. Rochelmeyer, H. Stützel, and H. Chen. Arch. Pharm. 282, 92 (1944); E. Schüttler and H. 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.

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