Cycloids containing nitrogen. 



772 



1934 



CYCLOID C4H4O4N4 



Pseudodiazoacetic acid 



PSEUDODIAZOACETAMIDE 



NH2.CO.C<JJ^"|>C.CO.NH2 



and tlie amvionium salt. 



Curtius, T!i., Darapsky, A. imJ 

 Miiller, E. I.e. 



CYCLOID C5H4O2N4 



Xanthine and its derivatives. 

 Wood, J. K. The affinity constants 

 of xanthine and its metlivl derivatives. 

 London, J. Chem. Soc, 89, 1906, (18.39- 

 1847); [abstract] London, Proc. Chem. 

 See, 22, 1906, (271-272). 



CYCLOIDS C5H,03N4 



Uric acid derivatives. 



Wood, J. K. The acidic constants of 

 some ureides and nric acid derivatives. 

 London, J. Chem. Soc, 89, 1906, (1831- 

 1839) ; [abstract] London, Proc. Chem. 

 Soc, 22, 1906, (271 1. 



CYCLOID C H10O2N4 



Caffeine 



3',8-DlCnLOROCAFFEINE 

 S'-METnoxy-S-CIILOKOCAFFEISE 



7',8-DiCHLonocAFrEisE 

 Tetrachlorocaffeine 

 Tetramethoxycaffeine. 



Fiscber, E. und Ach, Fr. Berlin, Ber. 

 D. chem. Ges., 39, 1906, (423-435). 



CYCLOID C, H,02N4 



Alloxazine 



N:C.NH.CO 



Mohlau, P. und Litter, II. J. prakt. 

 Cliera., Leipzig, (N.F.), 73, 1906, (472- 

 487). 



CYCLOID C, H0,N4 



Acetylalloxantin 



also CEXZOYLALLOXAXTIX. 



Friedrich, II. Liebi/rs Ann. Chem., 

 .Lcijizi.cr, 344, 1906,(1-18). 



CYCLOID C,,Hm02N4 



3-Metliyl-8-isobutylxanthine. 



Traube, \V. mid Nithack, W. Berlin, 

 Ber. D. ciiem. Ges., 39, 1906, (227-235). 



CYCLOID CuHkON4 



Salicylidene-C-dimethyltetrazoline 



CMe^ 



/ 



X- 



CH.CeH^.OH^CMe 

 X 



Ruhemann, S. F. . . . and the 

 correspondii]<4' cinnamvlidene derivative.] 

 London, J. Chem. Soc", 89, 1906, (1268- 

 1273) ; [abstract] London, Proc. Chem. 

 Soc,' 22, 1906, (238). 



CYCLOID CiiHi O2N4 



1,3-Dimethyl-S-isobutyl-xanthine 



{S-I sohut ijltlieopli i/irni) . 



Traube, W. nnd Nithack, W. Berlin, 

 Ber. D. chem. Ges., 39, 1906, (227- 

 235). 



CYCLOID C,2Hio03N4 



3-Methyl-'^-oxyplienylxanthine 

 Traube, W. nnd Nithack, W. I.e. 



CYCLOID CUH12O2N4 



1 ,3-Dimethyl-S-phenylxanthine 



{S-PJienijIUicopJii/Uiii). 

 Traube, W. und Nithack, ^X. I.e. 



CYCLOID C,7H,,G;N4 



1,3-Diphenyluric acid 



NPh.CO.C.XH 



CO.XPli C.XH^ 



WMteley, M. A. . . . Synthesis. 

 London, Proc. Chem. Soc, 22, 1906, 

 (200-201). 



CYCLOID CisHuONi 



Benzylplienyloxypurine 



7-Benzyl->S-piii:nyl-(:i ANiNE. 



Traube, W. nnd Nithack, W. Berlin, 

 Ber. I), chem. Ges., 39, 1906, (227-235). 



CYCLOID CicH,404N4 



Diphenylhydantil. 



Gabriel, S. Liebigs Ann. Chem., 

 Leipzig, 350, 1906, (118-134). 



CYCLOID C, H,„0:N4 



3-Metliyl-7-benzyl-.^phenylxantliine 



Traube, W. und Nithack, W. Berlin, 

 Ber. 1». chem. lies., 39, 1906, (227-235). 



