Results 1 - 10 of 7934
Results 1 - 10 of 7934. Search took: 0.032 seconds
|Sort by: date | relevance|
[en] Recent studies demonstrate the important roles of surface ligands in creating metal-organic interfaces that can significantly improve both catalytic activity as well as selectivity of chemically synthetized nanoparticle (NP) catalysts. Both steric and electronic effects can be efficiently used to tune catalytic properties of the NPs. Here, we overview the recent advancements in the field of the surface science of NPs for their catalytic applications and discuss the steric and electronic effects of ligands immobilized at the NP surface on the activity and selectivity of catalytically active NPs in different catalytic reactions.
[en] Data on fluoroalkylation and perfluoroalkylation methods in organic synthesis are analyzed, summarized and described systematically. The most practically important properties of compounds with fluoroalkyl substituents are illustrated. The key trends and the potential of this field of organic chemistry are considered. Electrochemical syntheses of perfluoroalkyl derivatives that are inaccessible or experimentally difficult to prepare by regular chemical techniques are presented. Particular attention is paid to processes involving organometallic compounds as well as to prospects for the development of this field of research. The bibliography includes 226 references
[en] Voltammograms of uranocene in benzonitrile under an Ar atmosphere were recorded in studies to measure the controlled oxidation of the compound. The results indicated that cyclooctatetraene (COT) was librated during the electrolysis, and NMR data indicated that no more than 1/3 of all the COT ligand was librated as free COT. Combination of these data led to the conclusion that oxidation produced a dimeric or cluster product cation
[en] Isotopically labeled compounds play an important role in chemistry, biology, and medicine. In recent years, organometallic chemistry has been utilized extensively in the development of labeled compounds. Syntheses involving the use of organoboranes have proven to be among the most versatile and effective of the new labeling methodologies. 26 refs
[en] A semiemperical model is presented to calculate diamagnetic susceptibilities of organotin compounds. Diamagnetic susceptibilities are considered to be contributed by the atoms, bonds, and bond–bond interactions. An excellent agreement between semiemperically calculated and experimental values of diamagnetic susceptibilities is reported. (AIP)
[en] Published data on the synthesis, structure, properties and applications of metal derivatives of tetrazoles are generalised and described systematically. Compounds based on the anionic and neutral tetrazole forms, C- and N-mono- and C,N-disubstituted tetrazoles are considered.
[en] Data on substitution reactions at boron atoms in 10-12-vertex metallacarboranes, which are of fundamental and applied significance, are generalised. The possible mechanisms of substitution reactions and the influence of the metal fragment on substitution positions in the polyhedron are discussed.