The known properties of alkyl and aryl derivatives of transition elements are reviewed, with particular attention to binary compounds of this type. Factors contributing to thermal stability of metal—carbon a-bonds are discussed and new contributions are presented dealing with: (1) chemistry of titanium(Iv) and titaniurn(n); (ii) metal—carbon bonds in N,N'-ethylenebis(salicylideneiminato) comple...

Chiral metal-templated complexes are attractive catalysts for organic synthetic transformations. Herein, we introduce a novel chiral cobalt(III)-templated complex based on trans-3,4-diamino-1-benzylpyrrolidine and 3,5-di-tert-butyl-salicylaldehyde which features both hydrogen bond donor Brønsted base functionalities. The obtained were fully characterized by 1H, 13C NMR, IR-, UV-vis, CD-spectros...

Development of CCC-NHC pincer Co complexes via transmetalation from Zr is reported. Formation of these air-stable Co(iii) complexes was achieved through use of a CoCl2 or Co(acac)3in situ or with a discrete CCC-NHC pincer Zr transmetallating agent. Preliminary activity in the hydroboration of styrene is reported. This facile methodology will further the development of CCC-NHC pincer first-row t...

Sir: We recently reported 1 that cobaloximes and cobalamins reacted with vinyl ethers, in the presence of alcohols, to give aceta Is containing cobalt-carbon cr-bonds. On the basis of these, and earlier 2 experiments, we suggested that the reactions proceeded via the intermediary of a Co(lII)-olefin 7r-complex. Schrauzer, et al.,3 then reported that they were unable to confirm our results and c...

The synthesis and characterization of a series of cobalt complexes featuring a pincer bis(carbene) ligand of the meta-phenylene-bridged bis-N-heterocyclic carbene ((Ar)CCC, Ar = 2,6-diispropylphenyl or mesityl) are reported. Cleavage of the aryl C-H bond of the ligand was achieved in a one-pot metalation procedure using Co(N(SiMe3)2)2(py)2, an equivalent of exogenous base, and trityl chloride t...

abstractthe ability of hesperidin (hp) to form complexes with five metals; cobalt, nickel, zinc, calcium and magnesium was investigated. the complexation was studied using u.v spectroscopic titration, in methanol as well as aqueous buffer solutions (physiological conditions). potential complexes were studied by ir and nmr spectroscopy, melting point and their solubility were also evaluated. the...