Evidence from in Situ X-ray Absorption Spectroscopy for the Involvement of Terminal Disulfide in the Reduction of Protons by an Amorphous Molybdenum Sulfide Electrocatalyst
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A parallel study of the radical-copper enzyme Galactose Oxidase (GOase) and a low mol. wt. analog of the active site (Wang et. al. , Science 279, 537 (1998)) was performed with dynamical d. functional and mixed quantum-classical (QM/MM) calcns. This combin ...
At low temperature, 1-alkoxy-1,3-dienes add to sulfur dioxide activated by a Lewis or protic acid generating zwitterionic intermediates that can be quenched by enoxysilanes. The resulting beta,gamma-unsaturated silyl sulfinates can be desilylated by 1:1 Pd ...
The energetics of dissocn. reactions of S82+ into stoichiometric mixts. of Sn+, n = 2-7, and Sm2+, m = 3, 4, 6, 10, were investigated by the B3PW91 method [6-311+G(3df)//6-311+G*] in the gas phase and in soln., with solvation energies calcd. using the SCIP ...
At -55-degrees-C SO2 adds to 4-[(tert-butyl)dimethylsilyloxy]-1-methoxy-2,3,6,7-tetramethylidenebicyc lo[3.2.1]octane reversibly and selectively onto the s-cis-butadiene moiety at C(2), C(3) giving a single regioisomeric sultine. At -45-degrees-C the chele ...
Chloroprene (= 2-chlorobuta-1,3-diene; 4b) and electron-rich dienes such as 2-methoxy-(4c), 2-acetoxy(dd), and 2-(phenylseleno)buta-1,3-diene (4e) refused to equilibrate with the corresponding sultines 5 or 6 between -80 and -10degrees in the presence of e ...
A parallel study of the radical copper enzyme galactose oxidase (GOase) and a low mol. wt. analog of the active site was performed with dynamic d. functional and mixed quantum-classical calcns. This combined approach enables a direct comparison of the prop ...
The reactivity of sulfur dioxide toward variously substituted butadienes was explored in an effort to define the factors affecting the competition between the hetero-Diels-Alder and cheletropic additions. At low temperature (< -70degrees), 1-alkyl-substitu ...
As other monosaccharide mimics such as the azasugars and the carbasugars (with nitrogen and carbon atom, respectively, instead of oxygen atom in the ring) the thiosugars (with sulfur atom instead of oxygen atom in the ring) have gained importance in glycob ...
The electrochem. prepn. of ceric sulfate [13590-82-4] was studied in concd. H2SO4 (10 mol/dm3). The current efficiency of the reaction increases considerably if a mixed catalyst (Ag2SO4 + MnSO4) is used. [on SciFinder (R)] ...
Under conditions of kinetic control (-20-degrees-C), the competition between the cheletropic and homocheletropic addition of SO2 to 5,6,7,8-tetramethylidenebicyclo[2.2.2]oct-2-ene 8 was unaffected by a methyl substituent at C(2). However, the latter induce ...
