The value of low-energy ionic collisions for selective surface analysis is shown by the fact that reactive scattering allows differentiation of isomeric chemisorbates. Reactions of Cr•+ and Cr-containing cations at chlorobenzyl mercaptan (CBM) monolayers on Au surfaces show different reaction products, depending on the position of chlorine substitution in the phenyl ring. The chlorine atom abst...

The complex [ { Rh(p-Pz)(CNBut)2)2] (1) acts as a supernucleophile due to the strong basicity induced by the isocyanide ligands. It reacts rapidly with halocarbons (RX) such as PhCH2Cl or Me1 to give the cationic dirhodium(II1) complexes of formula [ { Rh(p-Pz)(R)(CNBut)2)2(p-X)]X. These reactions are stereoselective since the single stereoisomer formed presents both organic groups ( P h C H 2 ...

Halide clusters of Group 5–7 metals develop catalytic activity above 150–250 °C, and the activity is retained up to 350–450 °C by taking advantage of their thermal stability, low vapor pressure, and high melting point. Two types of active site function: the solid Brønsted acid site and a coordinatively unsaturated site that catalyzes like the platinum metals do. Various types of catalytic react...

In contrast to the multiple low abundance 2,4-dinitrophenylhydrazine-reactive tryptic peptides formed by oxidation of LDL with reagent HOCl in vitro, myeloperoxidase-catalyzed oxidation produces a dominant product in considerably greater yield and selectivity. This modified peptide had a single amino-terminal sequence corresponding to amino acids 53-66 of apolipoprotein B-100 (apoB-100), but it...

[Me(2)Si(Cp(Me(2)))(2)]W(H)Cl is obtained via reaction of WCl(6) with a mixture of [Me(2)Si(Cp(Me(2)))(2)]Li(2) and NaBH(4), from which the dichloride [Me(2)Si(Cp(Me(2)))(2)]WCl(2) is obtained via treatment with CHCl(3). [Me(2)Si(Cp(Me(2)))(2)]WCl(2) provides a means to access other ansa tungstenocene compounds, such as [Me(2)Si(Cp(Me(2)))(2)]WH(2), [Me(2)Si(Cp(Me(2)))(2)]WMe(2), and [Me(2)Si(C...

Abiotic degradative pathways are often overlooked when evaluating natural attenuation at chlorinated solvent sites. Yet, at many sites, significant degradation of parent compounds such as 1,1,1-TCA, PCE and TCE is observed without the corresponding accumulation of daughter products, a sure indication of abiotic reactions. The problems in integrating abiotic processes into MNA are how to prove t...

Functionalized alkenyl chalcogenides (S, Se and Te) have great potential in organic synthesis, since they are valuable intermediates for the selective preparation of several organic compounds.1-7 The synthesis of vinylic chalcogenides has therefore attracted the attention of several research groups, and many novel methods for their preparation have been proposed in the last years.1-7 We describ...

Hydrolysis is a water substitution reaction that aids in the breakdown of many organic molecules. While it has been long studied and used by chemists, hydrolysis has been underutilized by the environmental remediation community. Hydrolysis has been overlooked because its reaction rates, at ambient conditions, are in most cases too slow for efficient degradation of harmful organic compounds. In ...