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SiGNa Chemistry has developed three categories of alkali metal-nanostructured silica materials (M-SG): Stage 0 materials are strongly reducing pyrophoric powders. Stage I materials are nonpyrophoric, free-flowing black powders with reactivity equivalent to neat alkali metals. Stage II is less reducing but reacts with water to produce hydrogen at pressures from ambient to several thousand psi. All three categories of M-SG, with different metals and metal alloys absorbed, are available commercially. CAUTION: With all M-SG materials, strong exothermic reactions may occur with liquid water or sufficiently moist air.
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SiGNa Chemistry has developed three categories of alkali metal-nanostructured silica materials (M-SG): Stage 0 materials are strongly reducing pyrophoric powders. Stage I materials are nonpyrophoric, free-flowing black powders with reactivity equivalent to neat alkali metals. Stage II is less reducing but reacts with water to produce hydrogen at pressures from ambient to several thousand psi. All three categories of M-SG, with different metals and metal alloys absorbed, are available commercially. CAUTION: With all M-SG materials, strong exothermic reactions may occur with liquid water or sufficiently moist air.
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Experimental procedures can be found in the Supporting Information
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Experimental procedures can be found in the Supporting Information.
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Because a two-electron S-N bond cleavage is this paper's focus, the molar equivalency of the M-SG reactants is reckoned in terms of pairs of electrons, i.e, as 1/2 the total number of moles of alkali metal present. Thus, if reaction efficiency were perfect, 1 equiv of M-SG, so termed, would cleave 1 mol of tosyl amides; its reaction with ethanol (2 mol) forms 1 mol of H2 gas. This choice of terminology places the M-SG reagents on the same equivalence-counting scale as, for instance, lithium triethylborohydride or other single hydride donor reducing agents
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2 gas. This choice of terminology places the M-SG reagents on the same equivalence-counting scale as, for instance, lithium triethylborohydride or other single hydride donor reducing agents.
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