نتایج جستجو برای: protic acid
تعداد نتایج: 748132 فیلتر نتایج به سال:
In article number 2003854, Ying Bai, Hongcai Gao, Chuan Wu and co-workers provide an in-depth understanding of the steady state sodium in hard carbon. Due to electron transfer between carbon Na-ions, stored exhibits metallic properties, which can be verified by reaction protic solvents (ethanol) sodium.
Bis(2-hydroxyethyl) ammonium stearate (DES) protic ionic liquid crystal (PILC) has been added in 1 wt% and 2 proportion to di-bis(2-hydroxyethyl) succinate (DSU) (PIL) obtain (DSU+1%DES) (DSU+2%DES) lubricant blends. The new blends are non-Newtonian fluids with crystalline domains. Addition of PILC PIL reduces running-in friction coefficient more than 70% prevents surface damage, decreasing wea...
When 2'-O-methoxytetrahydropyranyl-5'-O-(9-phenylxanthen-9-yl) uridylyl-(3'----5')-(2',3'-di-O-acetyluridine) 2-chlorophenyl ester (9) is treated with zinc bromide in dichloromethane-propan-2-ol (85:15 v/v) at room temperature, under stringently anhydrous conditions, the corresponding 5'-unblocked dinucleoside phosphate (10) is obtained in 86% isolated yield; however, when no special precaution...
Gas phase studies offer an ideal medium whereby structural and reactivity properties of charged species may be unveiled in the absence of solvent, matrix or counterion effects. In this environment NO binds to iron(II)and iron(III)-hemes with comparable kinetics and equilibrium parameters, conclusively elucidating the factors determining the widely different affinity in protic solvents or in hem...
An asymmetric intermolecular Stetter reaction of enals with nitroalkenes catalyzed by chiral N-heterocyclic carbenes has been developed. The reaction rate and efficiency are profoundly impacted by the presence of catechol. The reaction proceeds with high selectivities and affords good yields of the Stetter product. Internal redox products were not observed despite of the protic conditions. The ...
We are developing methods that restrict the conformational mobility of peptides and related heteropolymers while simultaneously altering their properties. Our experiments occur as processes wherein a conserved, lipophilic reagent is activated in stages to form composite products with unprotected polyamides in parallel. For each starting oligomer, the goal is to create not one, but rather a coll...
The reaction pathway during the formation of silica via a two-component "non-aqueou" sol-gel synthesis is studied by in situ time-resolved Raman spectroscopy. This synthetic route is followed with and without the addition of the protic ionic liquid 1-ethylimidazolium bis(trifluoromethanesulfonyl)imide (C2HImTFSI) in order to investigate its effect on the reaction pathway. We demonstrate that Ra...
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