Polymeric manganese(II) and nickel(II) pyrazolates: synthesis, characterization, and magnetochemistry

Article Abstract:

Direct reactions of manganocene and nickelocene with molten pyrazoles under vacuum or in an inert atmosphere have made it possible to isolate a number of metal pyrazolate compounds. Indirect evidence indicates that the compounds have extended chain structures with metal ions linked by double-bridging pyrazolates. Two of the compounds are diamagnetic and the others paramagnetic. Antiferromagnetic coupling exists between neighboring metal ions, based on findings of variable temperature magnetic susceptibility studies on the paramagnetic compounds.

Observations, Manganese, Manganese (Metal), Nickel, Antiferromagnetism, Transition metal compounds

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Palladium-catalyzed cross-coupling reactions of organoboron compounds

Article Abstract:

The interaction between organoboron reagents and organic halides or related electrophiles follow the palladium-catalyzed cross-coupling reactions. These reactions lead to carbon framework of target molecules and nontoxic byproducts, under mild conditions. The sequential steps of the reaction are oxidative addition, transmetalation, and reductive elimination sequences. Alkyl, allylic, 1-alkenyl, aryl, and 1-alkynyl compounds react with aryl- and 1-alkenylboron reagents in the presence of palladium.

Research, Usage, Organoboron compounds, Palladium catalysts

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Free-radical reactions in the synthesis of alpha-amino acids and derivatives

Article Abstract:

The use of free-radical reactions in the synthesis of alpha-amino acids and their derivatives are enumerated and discussed. Among the classes of free radicals that are synthesized from amino acids and their derivatives which include sulfur radicals, aromatic radicals and aliphatic radicals, only the alpha-carbon-centered aliphatic radicals are peculiar to these molecules and their derivatives.

Analysis, Free radicals (Chemistry), Free radicals, Amino acids

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