113 Polyenes and Polyynes, Excluding Polyene Macrolides 



205 10-Hydroxydec-trans-2-ene-4,6-diynoic Acid, C^^H^oO^, colorless 



plates, m.p. 154.5°, U.V. 215, 222 (243) (225), 270, 

 285, 303 m;^ in ethanol. 



HOCH2— CH.— CH,— C=C— C^C— CH=CH— COOH 



Polyporus anthracophilus 



J. D. Bu'Lock, E. R. H. Jones and W. B. Turner, /. Chem. 

 Soc, 1607 (1957). 



206 Dimethyl Octa-trans-2,trans-6-dien-4-yne-I,8-dioate, CioHi„04, col- 



orless plates, m.p. 117-119.5°, U.V. (205), 214 (240) 

 (278), 292, 307 m/x in ethanol. 



CH3OOC— CH=CH— C=C— CH=CH— COOCH3 



Polyporus anthracophilus 



J. D. Bu'Lock, E. R. H. Jones and W. B. Turner, /. Chem. 

 Soc, 1607 (1957). 



207 Undec-3,5,6-triene-8,10-diynoic Acid, CnHgOa. 



HC^C— C=C— CH=C=CH— CH=CH— CH2— COOH 



Drosophila semivestita 



Marjorie Anchel, Science 126 1229 (1957). 



208 Nemotin, CnHgOo, unstable except in solutions, [ajn^^ +380° (c 



0.3 in ether), U.V. 207, 236, 248, 262, 276 m^x in water. 



HC=C— C=C— CH=C=CH— CH— CH2— CH2— C=0 



I o ' 



and 



209 Nemotinic Acid, CnHioOg, unstable except in solutions, [ajn" 



+320° (c 0.2 in ether), U.V. 208, 237, 249, 263, 277 m^x 

 in water. 



CH^C— C=C— CH=C=CH— CH— CH2— CH2— COOH 



I 

 OH 



Porta corticola, P. tenuis and another unidentified ba- 

 sidiomycete 



Yields of mixed acetylenes from one of the fungi were : 



