The presence of catechol functional groups in the PDA structure also enables the formation of coordination bonds with metal ions, transition metal ions included [15]. The ability to form this type of bonds has also been used for the binding of heavy metals by PDA [6,16]. However, these ar...
Because the strength of the basicity of catalyst and the activity of the silyl complex formed with silicon tetrachloride depends on the structure of the Lewis base, the transition states may be fundamentally not common. Table 2. Enantioselective chlorination of cis-stilbene oxide catalyzed by ...
Such impurities, when introduced onto the semiconductor chip during its manufacture, tend to produce localized defects in the crystalline structure which may then propagate to produce an undesirable epitaxy, and render the chip deficient or even useless for its intended purpose. Arsine and phosphine ...
We extend previous first-principles calculations of the equilibrium structure of the InP(100) surface to include atomic chemical potential contributions to the surface formation energies at various coverages. We confirm earlier conclusions that the surface will most likely assume a low indium coverage ...
For example, use of these transferases permits the transfer of Neu5Ac or analogues of Neu5Ac to the backbone structure as well as the transfer of fucose and analogues thereof to this backbone structure. However, there are alternative methods for preparing these compounds including methods which...
Zeolite MCM-22 can be prepared from a reaction mixture containing sources of alkali or alkaline earth metal (M), e.g., sodium or potassium, cation, an oxide of trivalent element X, e.g., aluminum, an oxide of tetravalent element Y, e.g., silicon, an organic (R) directing agent, he...
1. A process for alkylating an isoparaffin with an olefin comprising effecting reaction of isoparaffin and olefin in the presence of an alkylation catalyst complex comprising a Lewis acid-promoted solid component said solid component comprising a layered silicate and pillars of an oxide of at least ...
The catalyst used at present in the Haber-Bosch process consists of a mixture of iron oxide and relatively small amounts of oxides of lighter metals, e.g. potassium and aluminium. Modern plants in which this type of catalyst are used can be operated at 350°-400° C. and 200-350 atmosp...
or a carbon structure of C1-C7 group which may be saturated or unsaturated and cyclic or non-cyclic, and which optionally may be substituted with any of the above preceding groups including hydrocarbon compounds dimethyl ether, isopropyl ether, dipropyl ether, tert-amyl methyl ether, tert-butyl...
nanomaterials Article Design of Amine-Modified Zr–Mg Mixed Oxide Aerogel Nanoarchitectonics with Dual Lewis Acidic and Basic Sites for CO2/Propylene Oxide Cycloaddition Reactions Yi-Feng Lin 1,2,*, Yu-Rou Lai 1,2, Hsiang-Ling Sung 1,2, Tsair-Wang Chung 1,2 and Kun-Yi Andrew Lin 3,...