Cycloids containing oxygen. 



881 



1910 



CYCLOID CsHsOi 



2, 3-Dioxyxanthone 



aud the diaeetoxy derivative. 



Liebermann, C. und Lindenbaum, S. 

 Berlin, Ber. D. chem. Ges., 37, I'JOi, 

 (2728-2737). 



CYCLOID Ci3H,o04 



Difurfurylidenepropionic acid 



C4H3O.CH : CH 



C^HjO.CH : C.CO,TI 



Titherley, A. W. and Spencer, J. F. 

 [ay-Difurfurylidenepropionic ncid (a fur- 

 furvlidenpfuryli-?ocrotonic acid).] I ou- 

 don, J. Chem. Soc, 85, 1904, (183-192); 

 [abstract] Loudon, Proc. Chem. Soc, 20, 

 1904, (13-14). 



CYCLOID CnHuO.N 



Phenylpyromycuric acid. 



Baum, E. Berlin. Ber. D. chem. Ges., 

 37, 1901, (2919-2961). 



CYCLOID CuHgOi 



Naphthacoumarin carboxylic acid 



and the ethijl cstci'. 



Knoevenagel, E. uud Schroter, F. 

 Berlin, Ber. D. chem. Ges., 37, 1901, 

 (4481-4491). 



und Langensiepen, F. 



Berlin, Ber. D. chem. Ges., 37, 1901, 

 (4492-449H). 



CYCLOIDS C15HK1O4 



1, 3-Dioxyflavone (C/j/'^/.sin) 



Synthesis 



also 2,4-lJllil!OMO-l,.3-l>I.METHO\YFL\Vi)NE . 



Eostamecki, St. von und Lampe, V. 

 Berlin, Ber. D. chem. Ges., 37, 1904, 

 (3107-3168). 



2-Oxyflavonol 



Mctlnjl, etlnjl and acelijl derivatives. 



Eostanecki, St. von und Lampe, \. 

 Berlin, Ber. D. chem. Ges., 37, 1904, 

 (773-778). 

 (d-9724) 



3 Oxyflavonol 



Methoxy and aceti.(\y-flavoxol. 



Kostaneckl, S. von und Stoppani, M. L. 

 Berlin, Ber. D. chem. Ges., 37, 1904, 

 (1180-1182). 



Benzylidene-dioxycoumaranone 



2', 3' and V-mtrohenzijUdene derivatives 



also 2'-ehloro, i'-methijl, A'-metJioxy aud 



other henzijlidcnc derivatives. 



Feuerstein, W. und Brass, K. Berlin, 

 Ber. D. chem. Ges., 37, 1904, (821-827). 



CYCLOIDS Ci5Hi204 



2, 3'-Dioxyflavanone 



D(me//i (//-derivative. 



Kostaneckl, St. von und Ottmann, \ . 

 Berlin, Ber. D. chem. Ges., 37, 1901, 

 (957-960). 



2, 4'-Dioxyflavanone 



Dimelhijl-dQviy aiixe. 



Eostanecki, St. von und Stoppani, 



M. L. Berlin, Ber. D. chem. Ges, 37. 

 1904, (781-781). 



CYCLOID C,6Hi204 



Trioxyphenylmethylenebenzo- 

 pyranol 



H0.CeH3<— j^^^— >C.Cen3(0H). 



(Resacete'in) 



and its diethyl ether and the n'ltroso 



derivative of the d'letlnjl cfher. 



Billow, C. und Sautermeister, C. 

 Berlin, Ber. D. chem. Ges., 37, 1904, 

 (354-368). 



o-Oxo-/3-phenylroxyphenyl- 

 butyrolactone 



Methyl ether 



CHPh CO-^(^,Q 



CH(C6H4.0Me). 

 and the benzyl and acetyl compounds. 

 Erlenmeyer, E. jun. and Lattermann, 

 A. Liebigs Ann. Chem., l.eip/.ig, 333, 

 1904, (268-276). 



3 L 



