Magnetic Investigations of Spin-free Cobaltous Complexes. VI.¹ Complexes Containing Phosphines and the Position of Phosphines in the Spectrochemical Series

Infrared and Electronic Spectral Studies of Cobalt(II) and Nickel(II) Complexes of N-Allyl Urea and N-Allyl Thiourea

“…The magnetic susceptibility data are in the expected range of tetrahedral and octahedral complexes of cobalt(I1) and nickel(II), respectively. The observed regular increase in moments on proceeding from chloro to iodo complexes is in accord with ligand field theory (19,20).…”

Epoxidation of Cyclohexene With H2O2 and Acetonitrile Catalyzed by Mg–Al Hydrotalcite and Cobalt Modified Hydrotalcites

“…The product is a mixture of A and B cobalt complexes since in the case of chlorine ionic complexes the compound benzyltriphenyl phosphonium-triphenyl phosphine-trichlorocobaltate [C 6 H 5 CH 2 P C 6 H 5 ) 3 ] ? [(C 6 H 5 ) 3 PCoCl 3 ] -could not be obtained by this procedure [25].…”

“…The spectrum of the solid admixture of Co-complexes shows the characteristics specific for distorted tetrahedral symmetry of Co (II) species with very intense bands in the region of d-d transitions [25,27,30,31]. Meanwhile for the complex solved in acetone (that was used as catalyst in homogeneous conditions), the intense bands from the region of charge transfer up to 300 nm are absent and only the bands corresponding to d-d transitions of the complex can be noticed.…”

Cobalt‐Catalyzed Reductive Cross‐Coupling Between Styryl and Benzyl Halides

“…A screening of ligands revealed that PPh 3 was preferred (Table , entries 9–15). It is worth mentioning that using the pre‐synthesized [CoBr 2 (PPh 3 ) 2 ] complex, instead of adding CoBr 2 and PPh 3 separately, slightly improved the yield (Table , entry 16). With the preformed [CoBr 2 (PPh 3 ) 2 ] complex as catalyst, other additives were tested and sodium iodide was confirmed to be the most effective (Table , entry 17–19).…”