Magnetocaloric effect in 1D-polymers bearing 15-metallacrown-5 {GdCu} units and anionic oxalate complexes.

Two complexes {[GdCu(GlyHA)(HO)Cr(CO)]·11.02HO} (1) and {{[GdCu(GlyHA)(HO)]μ-[Cu(CO)(HO)]}μ-[Cu(CO)]·15.8HO} (2), were obtained as outcomes of the reactions between the cationic hexanuclear {GdCu(GlyHA)} 15-metallacrown-5 complex (where GlyHA = glycinehydroxamate) and the anionic oxalate complexes K[Cr(CO)] or K[Cu(CO)].

Parallel Minisci Reaction of -Difluorocycloalkyl Building Blocks.

Parallel Minisci reactions of nonfluorinated and -difluorinated C-C cycloalkyl building blocks (trifluoroborates and carboxylic acids) with a series of electron-deficient heterocycles were studied. A comparison of the reaction's outcome revealed better product yields in the case of carboxylic acids as the radical precursors in most cases, albeit these reagents were used with three-fold excess under optimized conditions. The nature of the heterocyclic core was found to be important for successful incorporation of the cycloalkyl fragment.

Advances and Challenges in Development of Transition Metal Catalysts for Heterogeneous Hydrogenation of Organic Compounds.

Actual problems of development of catalysts for hydrogenation of heterocyclic compounds by hydrogen are summarized and discussed. The scope of review covers composites of nanoparticles of platinum group metals and 3d metals for heterogeneous catalytic processes. Such problems include increase of catalyst activity, which is important for reduction of precious metals content; development of new catalytic systems which do not contain metals of platinum group or contain cheaper analogues of Pd; control of factors which make influence on the selectivity of the catalysts; achievement of high reproducibility of the catalyst's performance and quality control of the catalysts.

Redox Behavior of Cobalt-Phosphine Complexes vs Their Catalytic Activity in Organozinc Compound Formation: Background for Mechanistic Investigations.

Catalytic activity in arylzinc compound formation was studied for eight Co complexes with phosphines along with their redox properties for implementing the idea of rational design. It was found that Co(XantPhos)Cl and Co(-XantPhos)Cl demonstrated distinct reversible Co/Co redox processes and acted as efficient catalysts of arylzinc compound formation. Meanwhile, for Co(DPEphos)Cl, Co(dppf)Cl, Co(dppb)Cl, Co(PPh)Cl, and Co(XantPhos)(Piv) (the latter one without the addition of LiCl), reversible redox processes were not observed.

Screening of Palladium/Charcoal Catalysts for Hydrogenation of Diene Carboxylates with Isolated-Rings (Hetero)aliphatic Scaffold.

A series of seven palladium-containing composites, i.e., four Pd/C and three Pd(OH)/C (Pearlman's catalysts), was prepared using modified common approaches to deposition of Pd or hydrated PdO on charcoal.