...relation to color and to their chemical structure. II'. N. Hartley. Jour. Chem. Soc., 87, 1706 (1905)-— 1. Simple ureides exhibit spectra without absorption...cause the production of bands in their spectra when a C:O group is con verted into an ethylenic linking within the ring and a C-OH group adjoining it. 4....

...or heterocyclic benzenoid ring. The author summarises his conclusions äs follows: 1. Simple uroides exhibit spectra without absorption bands. 2. The linking...polyvalent atoms causes a powerful selective absorption, wbich is destroyed when the rings are disunited by hydrolysis or otherwise. 3. The purin compounds...

...containing a homocyclic or heterocyclic benzenoid ring. The author summarises bis conclusions äs follows: 1. Simple ureides exhibit spectra without absorption...The linking together of two simple ureides by one or morc polyvalent atoms causes a poweriul selective absorption, which is destroyed when the rings are...