Deuterium thermal desorption spectra were investigated on the samples of austenitic stainless steel 18Cr10NiTi preimplanted at 100 K with deuterium ions in the dose range from 3 × 10(15) to 5 × 10(18) D/cm(2). The kinetics of structural transformation development in the implantation steel layer was traced from deuterium thermodesorption spectra as a function of implanted deuterium concentration...

Deuterated organic molecules provide the basis for many applications in life sciences and material research. Thus, methodologies to access labeled compounds with defined selectivity continue be important. Using KOtBu as base DMSO-d6 deuterium source, we present a general applicable method selective deuteration of set nitrogen-containing heterocycles (pyridines, azines bioactive molecules). Expe...

The reaction of [Fe(N(SiM e3)2)2] with thiols RSH, elem ental sulfur, and neutral ligands L (with sulfur donor atoms, e.g. thiourea derivatives) gives [Fe4S4(SR )2L2] clusters in high yields. The structure of [Fe4S4(2.4.6-(C3H7)3C6H 2-S)2(dpdm i)2] (dpdmi: diisopropyldim ethylim idazolthion) was determ ined by X-ray crystallography. W hen [Fe4S4I4]2~ is reac ted w ith a large excess o f P M eP ...

A Ni-catalyzed reductive coupling of alkynes and epoxides using Ni(II) salts and simple alcohol reducing agents is described. Whereas previously reported conditions relied on Ni(cod)(2) and Et(3)B, this system has several advantages including the use of air-stable and inexpensive Ni(II) precatalysts (e.g., NiBr(2)·3H(2)O) as the source of Ni(0) and simple alcohols (e.g., 2-propanol) as the redu...

Kinetic studies on the reactions of Y-aryl phenyl isothiocyanophosphates with substituted X-anilines and deuterated X-anilines were carried out in acetonitrile at 55.0 °C. The free-energy relationships with X in the nucleophiles were biphasic concave upwards with a break region between X = H and 4-Cl, giving unusual positive ρX and negative βX values with less basic anilines (X = 4-Cl and 3-Cl)...

Photolysis of ketones (1, 1-oMe, 2, 2-oMe, 3, and 4) adsorbed on ZSM-5 zeolites produces persistent carbon-centered radicals that can be readily observed by conventional steady-state EPR spectroscopy. The radicals are persistent for time periods of seconds to many hours depending on the supramolecular structure of the initial radical@zeolite complex and the diffusion and reaction dynamics of ra...

The neocarzinostatin chromophore causes double-strand damage at AGC sequences on DNA by concomitant 1'-oxidation at C and 5'-oxidation at the T on the complementary strand. The extent of this damage is dependent upon the structure of the thiol used for activation. Deuterium isotope effects suggest that this dependence on thiol structure may be due to internal quenching of one radical site of th...

Because of the role that metal-mediated carbon-hydrogen bond activation could play in the conversion of saturated hydrocarbons to more useful, functionalized organic compounds, much effort has gone into developing mild methods for carrying out this transformation in solution.1 Most of the classical methods for activating C-H bonds involve oxidative addition reactions with uncharged, electron-ri...