In the past 15 years considerable progress has been made in the field of homogeneous catalyzed epoxidations of unfunctionalized olefins. Epoxidation is an important methodology for preparation of highly functionalized organic compounds; optically active epoxides especially are important intermediates. From many olefins it is now possible to create in only one step optically active epoxides in n...

Contamination of the environment by metals is recognized as a threat to health. One of their targets is the brain, and the adverse functional effects they induce are reflected by neurobehavioral assessments. Lead, manganese, and methylmercury are the metal contaminants linked most comprehensively to such disorders. Because many of these adverse effects can appear later in life, clues to the rol...

Naturally occurring manganese (Mn(iii/iv)) oxides are ubiquitous in a wide range of environmental settings and play a key role in numerous biogeochemical cycles. In addition, Mn(iii/iv) oxides are powerful oxidants that are capable of oxidizing a wide range of compounds. This review critically assesses the reactivity of Mn oxides with organic contaminants. Initial work with organic reductants e...

Reactions of MnX(2) meltsalt (X = Cl and ClO(4)) and a quinquedentate Schiff base ligand together with its coligand azides in MeOH produced the unprecedented assembly of novel octa- and hexadecanuclear manganese clusters containing two and four alternant tetrahedral Mn(III)(3)Mn(II) cores bridged by Schiff base ligands and versatile azides groups. The magnetic measurements on both compounds ind...

SOD2 encodes manganese superoxide dismutase, a mitochondrial enzyme that protects the cell against damage from superoxide free radicals. A common polymorphism, a T ! C transition (Val16Ala), was shown to alter the manganese superoxide dismutase mitochondrial targeting sequence (1). Animal studies have linked reduction in manganese superoxide dismutase activity to increased DNA damage and higher...

SOD2 encodes manganese superoxide dismutase, a mitochondrial enzyme that protects the cell against damage from superoxide free radicals. A common polymorphism, a T ! C transition (Val16Ala), was shown to alter the manganese superoxide dismutase mitochondrial targeting sequence (1). Animal studies have linked reduction in manganese superoxide dismutase activity to increased DNA damage and higher...

The reactions o f M n(CF3COO)2 (1) with N,N,N',N'-tetramethylethylenediamine (tmen), 2,2'-bipyridine (bipy) and triethanolamine (tea) yield three new mononuclear coordination compounds: rra«5-[Mn(tmen)2(CF3COO)2] (2), cw-[Mn(bipy)2(C F3COO)2] (3), and [Mn(tea)2](CF3COO)2 (4). The X-ray structures o f the compounds 2, 3, and 4 are described. The seven-coordination o f the manganese(II) ion in 4,...

Two organometallic compounds containing zinc and manganese in different ratios are used as single-source precursors for the preparation of various new, bimetallic oxide materials with nanoscaled dimensions. It is shown that the materials synthesis can be performed in the solid-state, the liquid-phase, and even in the gas-phase. The molecular composition of the precursors determines the composit...