Cycloids containing nitrogen. 558 



1934 CYCLOIDS WITH FOUR 

 ATOMS OF NITROGEN IX 

 THE RING. 



Fischer u Helferich. 110864. Syn- 

 thetische Glucoside der Purine. 



Palazzo e Marogna L13922. Sintesi 

 di due ossitetrazoli isomeri da azoim- 

 ruide e acido Eulrninico. 



Ponzio e Gastaldi. 114191. La 

 diaminotetrazina sinimel rica. 



1934 



e Macciotta. 11-419:}. 



Nuovo metodo di preparazione dei tetra- 

 zoli. 



SPECIAL. 



CYCLOID C 5 H«N 4 



Trimethylenetetrazine 

 CH. 



N — N 



CH 2 < ni ( ' H >CH 2 



N— N 



Miiller. B., 47, (3001). 



CYCLOID C 8 H 8 N 4 



l-p-Tolyltetrazole 

 5-Sui.pnyDRo derivative. 



Oliveri-Mandala. 113845. 

 CYCLOID CuH^N, 



Diphenyltetrazole 



o- and p-AMlNO derivatives 

 ,N : N 

 \\ T : CPh 

 Ponzio e Macciotta. < !., 44, ii, (63). 



NH 2 C,H 4 .N< i 



CYCLOIDS CONTAINING FOUR 

 NITROGEN ATOMS AND OXYGEN. 



CYCLOID C f ,H 4 3 N 4 



Uric acid. 



Biltz u. Damm. 109606-109607. 

 Abkommlinge der 3, 7-Dimethylharn- 

 saure und seiner Glykoldialkylather. 



u. Heyn. 109608. Harn- 



saure-glykol. 



Gudzent. 111421. Zur Anomalieder 

 Harnsaureloalichkeit (kolloide Harn- 

 siiure). 



Ringer. 114504. Quadriurate. 



CYCLOID C 7 H 8 2 N 4 



Theophylline 

 co< NMe.CO.C.NH > 



NMe C.N 



Decomposition. Also 7-AOETYLTHEO- 



PHYI.LINE. 

 Biltz u. Strufe. A.. 404, (137, 170). 



Theophylline rhamnoside. 

 Fischer u. Fodor. 110860. 



CYCLOIDS C 7 H 8 0,N 4 



3 : 7-Dimethyluric acid 



C0< NH.C().C.NMe 

 NMe — C.NH 

 and derivatives. 



Biltz u. Damm. A., 406, (27). 109606- 

 109607. 



3 : 7-Dimethylisouric acid 



co< NH.CO.CH.NM e> 

 NMe— C:N.CO 

 5-Chloro derivative. 

 Biltz u. Damm. A., 406, (23, 29). 



CYCLOID C,H 10 4 N 4 



4 0xy-3 : 7-dimethyl-dihydro-uric 

 acid 



co NII.CO.CH.NMe 

 NMe — C(OH).NH 

 Biltz u. Damm. A., 406, (56). 



CYCLOIDS C ; H 10 O 5 N 4 



1 : 3-Dimethyluric acid glycol 

 co NMe.CO.C(OH).NH Q 



NMe C(OH).NH 



Biltz u. Strufe. A., 404, (131). 



3 : 7-Dimethyluric acid glycol 



( , 0< NH.CO.C(OH).NMe >co 



NMe— 6(OH).NH 



Biltz u. Damm. A., 406, (31) ; (36) ; 

 (59). 



CYCLOID C 8 H 10 O 4 N 4 



Hypocaffeine 

 p ^ NMe.00 

 W< NMe.C NMe.CO 



^CO . NH 

 BUtz u. Damm. A., 406, (97). 



