Selection of the most appropriate aprotic solvent
also increased the efficiency of bixin absorption onto kaolinite.
Thus, we tried geometry optimization in the acetonitrile solvent (aprotic solvent
) using the wB97X-D/6-31G(d,p) model and CPCM solvation model  and found a drastic effect on the relative stability of the tautomers as can be seen from the data summarized in Table 4.
N-Methyl-2-Pyrrolidone, also referred to as N-Methylpyrrolidone, is an organic, colourless, polar aprotic solvent
characterised by relatively lower volatility and higher flash point.
The solvent used was tetrahydrofuran, an aprotic solvent
with dielectric constant (e) 7.58 to 20 [grados]C.
On the other hand, THF is aprotic solvent
and less polar than EtOH; such effect does not exist and thus transfer absorption band is more favorable in this solvent than EtOH.
Dimethylsulfoxide is a versatile nonaqueous dipolar aprotic solvent
having wide range of applications.
The present work deals with the electrochemical reduction of various carbonyl compounds such as (1) Acetone (2) Acetophenone (3) 4-Choloro benzaldehyde was carried out by using the weak acid (Phenol) in aprotic solvent
for the synthesis of the Pinacol.
It is comprised of heating to a temperature between 130[degrees]C-180[degrees]C a mixture comprised of one or more ethylenically unsaturated monomers; an initiator system comprising a compound selected from the group consisting of persulfates, peroxides, diazos, and combinations thereof; a substantially aprotic solvent
system; and maintaining the temperature of the mixture for a time sufficient to polymerize the monomers to a monomer to polymer conversion percentage of at least 95% by weight, wherein the polymer has a weight average molecular weight between approximately 900 and 7,000 Dalton, a hydroxyl number of at least 240 and an acid number greater than 240.
Any aprotic solvent
(no groups that will react with the urethane)--aromatic hydrocarbons, aliphatic hydrocarbons, esters, and ketones--can be used.
-- The anion pi-radicals of four structurally-related 2-substituted fused-ring oxazoles have been electrochemically generated at a platinum electrode in an aprotic solvent
. The relative importance of the planar fused ring(s) versus the nature of the aromatic ring substituted at the oxazole two position on the pi-radical reactivity toward a weak proton donor is investigated and discussed.
This means that CoPc and ZnPc have the great tendency towards aggregation in polar aprotic solvent
. However NiPc was relatively weak for dimerization in the same solvents.
Since the first and second trials were not fully successful the solvent was changed from THF (a weakly polar aprotic solvent
) to dimethylformamide (DMF) (stronger polar aprotic solvent
) and allowed to react for 20 hrs.