http://alpha.chem.umb.edu/chemistry/ch611/documents/C-Htransitionmetalbonds.pdf

Carbonhydrogen-transition metal bonds

Chemistry of Transition Metal Cyanide Compounds: Modern Perspectives

/pdf/are-alkyne-reductions-chemo-regio-and-stereoselective-enough-2k025fyx4w.pdf

Are alkyne reductions chemo-, regio-, and stereoselective enough to provide pure (Z)-olefins in polyfunctionalized bioactive molecules?

Publisher Summary The liquid phase oxidation of hydrocarbons by molecular oxygen forms the basis for a wide variety of petrochemical processes including the manufacture of phenol and acetone from cumene, adipic acid from cyclohexane, terephthalic acid from p -xylene, acetaldehyde and vinyl acetate from ethylene, and propylene oxide from propylene. The majority of these processes employ catalysis by transition metal complexes to attain maximum selectivity and efficiency. This chapter describes the subject of metal-catalyzed oxidations of organic compounds in the liquid phase, largely within a mechanistic framework. A better understanding of the catalytic action of metal complexes is essential from the point of view of increasing selectivity and efficiency. Metal-catalyzed oxidations may be conveniently divided into two types—homolytic and heterolytic. The homolytic catalysis involves soluble transition metal salts (homogeneous), such as the acetates or naphthenates of Co, Mn, and Cu, or the metal oxides (heterogeneous). Heterolytic catalysis involves reactions of organic substrates coordinated to transition metals.

Metal-Catalyzed Oxidations of Organic Compounds in the Liquid Phase: A Mechanistic Approach

Carbon-hydrogen-transition metal bonds

The crystal and molecular structures of the compounds [(η5-C5H5)Fe(CO)2]2(CH2)n, where 0 n = 3 and 4

Redetermination of the structure of (dioxygen)bis[1,2-ethanediylbis[diphenylphosphine]]iridium hexafluorophosphate

The anions [Re4(µ3-S)4(CN)12]4– and [Re4(µ3-Se)4(CN)12]4– each contain a tetrahedron of Re atoms held together by short Re–Re bonds, with one triply bridging S or Se atom per face of the tetrahedron.

Tetrameric cyano-rhenium complexes with sulphur and selenium bridges: preparation and X-ray crystal structures of (Ph4P)4[Re4S4(CN)12]·3H2O and (Ph4P)4[Re4S4(CN)12]·3H2O

The structure of primary nickel dithizonate Ni(Hdz)2 was determined from three-dimensional single-crystal X-ray data, collected by standard film techniques, and refined by the least-squares method to R= 0·12 for 2580 observed and unobserved reflections. The crystals are triclinic, space group P with a= 4·62, b= 10·99, c= 12·50 ± 0·02 A, α= 88·8, β= 97·4, γ= 99·1 ± 0·1°, and Z= 1. The molecule is centrosymmetric with the nickel atom in a square-planar environment bonded to each dithizone ligand through one nitrogen and one sulphur atom to give a five-membered chelate ring with Ni–S 2·19 and Ni–N 1·87 A. The unique non-phenyl hydrogen atom was located.

Crystal and molecular structure of primary nickel dithizonate

The lanthanide elements from lanthanum to lutetium inclusive are incorporated into the body of the periodic table. They are subdivided into three sub-groups according to their important oxidation states: La to Sm, Eu to Tm, Yb and Lu, so that Eu and Yb fall directly below Ba; La, Gd, Lu form a column directly below Y; Ce and Tb fall in a vertical line between Zr and Hf. Pm falls below Tc; both are radioactive, and not naturally occurring. The elements with easily attained 2+ and 4+ oxidation states are grouped and clearly differentiated. Gadolinium has an important position as the centre of four triads in the block of elements that surround it– La, Gd, Lu; Ba, Gd, Hf; Eu, Gd, Tb; Yb, Gd, Ce. This new arrangement has the advantages of compactness, simplicity and clarity – there are no tie lines; and important oxidation states of these metals are emphasized. The actinides are also accommodated within this system, and element 114 falls naturally below lead in Group 14.

Michael Laing

Papers

The crystal and molecular structures of the compounds [(η5-C5H5)Fe(CO)2]2(CH2)n, where 0 n = 3 and 4

Redetermination of the structure of (dioxygen)bis[1,2-ethanediylbis[diphenylphosphine]]iridium hexafluorophosphate

Tetrameric cyano-rhenium complexes with sulphur and selenium bridges: preparation and X-ray crystal structures of (Ph4P)4[Re4S4(CN)12]·3H2O and (Ph4P)4[Re4S4(CN)12]·3H2O

Crystal and molecular structure of primary nickel dithizonate

A Revised Periodic Table: With the Lanthanides Repositioned