Palladation of C2-protected diimidazolium salts with Pd(OAc)2 afforded complexes comprising C4-bound N-heterocyclic dicarbene ligands. The reactivity of these complexes towards Lewis acids (AgBF4, AgOAc) and Brønsted acids (H2SO4, H3PO4, HOAc) revealed that abnormal C4 bonding of the carbenes markedly increases the nucleophilicity of the coordinated palladium center as compared to C2 bonding. D...

In this study, ryegrass straw agricultural residue (Lolium multiflorum L.) was employed as an adsorbent material to remove methylene blue (MB) dye from aqueous solutions. Four adsorbents were produced using phosphoric acid and pyrolysis activating agents. The samples analyzed with TGA, FTIR, SEM, XRD techniques. A rapid adsorption of the MB obtained treated 40% H3PO4, reaching equilibrium in 2 ...

This paper is based on the idea of adaptation under which we mean the replacement of one element in a system with another with similar aspects. The first adaptation comes from the replacement of orthophospheric acid H3PO4 by arsenious acid H3AsO4. There is a close relation between calcium-sulfate and calcium carbonate-arsenate species. The main objective of this note is to give an explicit form...

I For a description of the phenomena of magnetic resonance see W. Gordy, W. V. Smith, and R. F. Trambarulo, Microwave Spectroscopy (New York: John Wiley & Sons, Inc., 1953), chap. v. See also chap. ii. by W. Gordy, of Chemical Applications of Spectroscopy, soon to be published by Interscience Publishers, Inc., in the "Techniques of Organic Chemistry" series, ed. A. Weissberger. 2 B. Commoner, J...