1930 



761 



1930 



CYCLOID C30H32N 



1, 2, 4, 5-Tetra -o-tolyLhexahydro- 



1, 2, 4, 5-tetrazole 



C,Hj . N— CH2— X . CVH, 



I I 



C^R^ . N— CH,— N . CyH, 



Also the p and m isomerides. 



Rassow, Berthold uud -Riilke, Ivurt. 

 J. jirakt. Chein., Leipzig, (X.F.), 65, 

 1902, (97-122). 



CYCLOID C32H36N4 



3, C-Dimethyl-], 2, 4, 5-tetra- 

 p-tolylhexahydro-l, 2, 4, 5-tetrazine 



C7H7 . N— CHile-N . C7H7 



I I 



C,H, . N— CHMe— N . C7H, 



Rassow, Berthold und Riilke, Kurt. 

 J. prakt. Chem., Leipzig, (N.F.), 65, 

 1902, (97-122J. 



CYCLOIDS CONTAINING FOUR 

 NITROGEN ATOMS AND OXYGEN. 



CYCLOIDS C4H404N4 



Bis-diazoacetic acid 

 CO2H . CH<^ : g>CH . CO2H 



Silberrad, Oswald. [Formation of 

 Ijisdiazo-acetic acid. The action of 

 nitrogen trioxide on bisdiazoacetamide.] 

 London, J. Chem. Soc, 81, 1902. 

 (602-605) ; [abstract] London, Proc. 

 Chem, Soc, 18, 1902, (44-45). 



CYCLOID C5H4O2N4 



Xanthine 



Syntliesi^t. 



Fischer, Emil uud Tiillner, Hermann. 

 Verwandlung der Isoharnsaure in Harn- 

 saure und Thioxanthin. Berlin, Ber. 

 D. chem. Ges., 35, 1902, (2563-2571). 



CYCLOIDS C5H4O3N4 



Uric acid. 



Tocher, J. F. The oxidation . . . 

 of uric acid . . . Pharm. J., Lon- 

 don, (Ser. 4), 15, 1902, (161-166). 



Kriiger, iLirtin und Schmid, Julius. 

 Die Eutstehung der Harnsiiure aus 

 freien Purinbasen. Hoppe-Seylers Zs. 

 phj-sioL Chem., Strassburg, 34, 1902, 

 (549-565). 



Vicario. Delavaleur comparee des 

 principaux dissolvants de I'acide urique. 

 J. pharm. chim., Paris, (ser. 6), 15, 1902, 

 (265-270). 



Isouric acid 



C0<5j^ • co><^'iI • ^'H . CN 



Fischer, Emil und Tiillner, Hermann. 

 Berlin, Ber. D. chem. Ges., 35, 1902, 

 (2563-2571). 



CYCLOID C6H6O3N4 



Thurm, Richard. Ueber die Konstitu- 

 tion der 5-Methylharnsaiire sowie der 

 Alkylderivate des Methyl uracils mid des 

 Nitrouracils. Diss. Hannover. Herz- 

 berg a. H. (Druck v. G. F. Preiss), 1902, 

 (33). 22 cm. 



•s-A-Diliydrotetrazine dicarboxylic 

 acid 



DfAillDE 



C^HeO^Ng i.e. 



NH2 . CO . C<^-^^.g>C . CO . NH2 



Silberrad, Oswald. [Preparation o£ 

 s - X - diliydrotetrazinedicarboxylamide 

 and the action of nitrogen trioxide and 

 caustic potash on it ; also its compounds 

 uitli mercurv.] London, J. Chem. Soc, 

 81, 1902, (605-607;; [abstract] Lon- 

 'lun, Proc. Chem. Soc, 18, 1902, (44). 



CYCLOID C3Hu,02N4 



Caffeine. 



Sawa, Seitaro. Are caffeine and anti- 

 jjyrin in high dilutions poisonous to 

 plants? Tokyo, Bull. Coll. Agric, 4, 

 1902, (411-412). 



Dekker, Johan. Theobromine, seine 

 Losungszahlen in deniiblichen Losungs- 

 mittelu uud seine Darstelluug aus den 

 Samenschalen. Amsterdam (J. H. de 

 Bussy), 1902, (81;. 23 cm. ; Pharm. 

 Weekbl., Amsterdam, 39, 1902, (741- 

 747). 



