CLXI1.-Researcheson Residual A f l n i t y and CP ordination. Part I I . Acetylacetonev of Selenium and Tellurium.By GJLBERT T. MORGAN and HARRY DUGALD KEITH DREW. THE acetyla.cetolne derivahives of t,he metals, metlallaids, and nonmetals ma,y be classified into three main groups. I. Meta.llic ac:eltylacelttosnea, in which t'he principal valeaoiee of t$hel metal are complet,ely satisfied by the univalent, a.cetylamtone radidel, C5H702, such as t'he thallous, glucinum, oupric, zinc, sca,ndium, aluminium, chromic, ferric, a.nd t,horium derivatives, amd numerous others. In many instances aoetylacehm has gimn wings t o the metals, for certain of these compoanda are va1a;tilei without decompmit(ion (Combes, C'om.pt.

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