417 Xanthones 



Helniinthosporixim ravenelii 



F. F. Nord and Robert P. Mull, Advances in Enzymol. 5 194 

 (1945). (Synthesis) 



887 Rubrofusarin, CjsHjoOg, orange-red needles, m.p. 210°. 

 Alternative structures : 



CH3 HO I II I CH3 



Or 



Fusarium culmorum (W.G.Sm.) Sacc, Fusarium 

 graminearum Schwabe (Gibberella saubinettii) 



888 Another pigment, aurofusarin,* C30H20O10, m.p. >360° 



889 and a colorless compound, culmorin, CjgHoeOo, m.p. 175°, 

 [(x]d^^ —14.45° were isolated from the same cultures. 



Julius Nicholson Ashley, Betty Constance Hobbs and Harold 

 Raistrick, Biochem. J. 31 385 (1937). 



Robert P. Mull and F. F. Nord, Arch. Biochem. 4 419 (1944). 

 (Structure) 



890 Asperxanthone, C^oH^^Or^, yellow needles, m.p. 203°. A 1-hy- 



droxydimethoxymethylxanthone which yields nor-rubro- 

 fusarin on demethylation. 



Aspergillus niger (mycelium) 



N. A. Lund, Alexander Robertson and W. B. Whalley, 

 J. Chem. Soc, 2434 (1953). 



891 Lichexanthone, CieHi405, yellowish crystals, m.p. 187°. 



CH3 O OH 



CH3O 



OCH3 



Parmelia formosana Zahlbr. 

 The yield was about V2 g. from 25 g. of lichen. 

 Yasuhiko Asahina and Hirashi Nogami, Bull. Chem. Soc. 

 Japan 17 202 (1942). 

 See entry 584. 



