aprotic solvent

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Related to Protic solvent: Polar solvent

aprotic solvent

[ā′präd·ik ′säl·vənt]
(chemistry)
A solvent that does not yield or accept a proton.
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The activity of the catalyst ([Zn.sub.1-x-y][Ag.sub.x][Co.sub.y]O) was studied varying the following parameters: doping percents of 0 [less than or equal to] x [less than or equal to] 0.05 and 0 [less than or equal to] y [less than or equal to] 0.05, [H.sub.2][O.sub.2]/styrene molar ratios from 1.1 to 3, reaction temperatures range (40[degrees]C-120[degrees]C), and the amount of the catalyst (0.005-0.02 g) in aprotic and protic solvents. Aliquots samples from the reaction mixture were taken at regular intervals and were monitored by gas chromatography (GC) equipped with FID using Rtx-5 capillary column.
It has been demonstrated computationally that polar protic solvents such as methanol interact with solutes such as phenols by accepting and donating hydrogen bonds.
Compared with aprotic solvents, protic solvents gave better yields, and ethanol displayed the best reactivity (Table-1, entries 12-18).
The behavior observed for [sup.99m]Tc[O.sub.4.sup.-] (Figure 1A) is associated with the hydrophilic characteristic of [sup.99m]Tc[O.sub.4.sup.-], which is soluble in water and in several other polar protic solvents such as alcohols.
Generally, [S.sub.N] reactions proceed faster in aprotic solvents, such as DMF and DMSO, than in protic solvents, such as water and alcohol.