Propan-2-ol solution

Materials Required Solution (1) [dilute 15 pi of anhydrous methanol (internal standard) with sufficient anhydrous propan-2-ol to produce 100 ml] Solution (2) (dissolve 4 mg of mentrophin sample in 0.5 ml of anhydrous propan-2-ol) Solution (3) [dissolve 4 mg of mentrophin sample in 0.5 ml of solution (1)] Solution (4) and 10 pi of water to 50 ml of solution (1) ... 

FIGURE 12.5 FT ESR (a) and (CW) TR ESR (b) spectra taken at times of several hundreds of nanoseconds following laser excitation of DAR in propan-2-ol solution. The asterisk marks the benzoyl radical. ... 

Davies AK, Navaratnam S, Phillips GO. Photochemistry of chlorpromazine (2-chloro-N-(3-dimethyl-aminopropyl) phenothiazine) in propan-2-ol solution. J Chem Soc Perkin Trans 1976 2 25-29. 

XPS. Overlayers deposited from the ODP/( i-heptane/ propan-2-ol) solution were also analyzed by XPS at two emission angles, 15° and 75°, corresponding to an information depth (Z = 32 sin 0) of s25 A (approximately one monolayer thickness) and s93 A, respectively, for phosphorus and tantalum. 2-values were derived from the Seah and Dench relation, assuming an organic matrix. Figure 3 displays the survey spectra obtained for both takeoff angles. 

Octadecyl phosphoric acid ester appears to form an ordered, oriented, self-assembled monolayer on a flat tantalum(V) oxide surface, when deposited from an n-heptane/propan-2-ol solution. The adsorption rate is rapid, with a complete tails-up layer being formed within minutes, according to contact angle and grating-coupler results. An optimal combination of assembly rate and film quality appears to be achieved with 50 or 500 solutions... 

Redox studies of the Ghini complexes are of considerable interest, as the change of nuclearity of [Pt3(GO)6] from n to (n—l) corresponds to a reduction. In one paper, the reduction has been studied by time-resolved pulse radiolysis in a water/propan-2-ol solution, where alcohol radicals are generated. " The initial step has been demonstrated to be the formation of [Pt3(GO)6] , which then immediately splits into [Pt3(GO)6]4 and [Pt3(GO)6] -4 The fate of the [Pt3(GO)6] 4 ion depends on n with the smaller values of n (6 or 7), dimerization tends to occur, whereas with larger values (8 or 9), further reduction is more likely. An additional observation was that if small quantities of [Pt3(GO)6]4 are formed in the presence of excess [Pt3(GO)6]6 X comproportionation results giving 2 equiv. of [Pt3(GO)6]s -... 

Dodecanethiol solutions. Solution A dissolve 16 cm of dodecanethiol in 1 L of propan-2-ol. Solution B dissolve 4 cm of dodecanethiol in 1 L of propan-2-ol. 

Fig. 3.35 Mercury porosimetry intrusion-extrusion plots of alumina gels prepared from solutions of aluminium monohydrate in A, propan-2-ol (2-5w/v%) B, propan-2-ol (4-9w/v%) C, 2-methylpropan-2-ol (4-9 w/v%) D, 2-methylpropan-2-ol (9-5 w/v%) E,butan-2-ol (9-5 w/v%). -------, ascending, intrusion curve -----, descending, extrusion curve.

That product was then heated under reflux with 50% hydrobromic acid for 1.5 hours. The reaction mixture was evaporated to dryness and reevaporated with three portions of propan-2-ol. The oil obtained was dissolved in propan-2-oi and diluted with ether. 3-Ethyl-3-(m-hydroxyphenyl)hexahydro-1 H-azepine was obtained. That material in turn was reductively methylated by hydrogenation in the presence of formaldehyde in absolute ethanol solution to give 3-ethyl-3-(m-methoxyphenyl)-1 -methylhexahydro-1 H-azepine. 

Sulphate can also be determined by an exactly similar procedure by precipitation as lead sulphate from a solution containing 50 per cent (by volume) of propan-2-ol (to reduce the solubility of the lead sulphate), separation of the precipitate, dissolution in excess of standard EDTA solution, and back-titration of the excess EDTA with a standard zinc solution using solochrome black as indicator. 

Alternatively, diazomcthanc can be added to thioxanthylium perchlorate (4) over 30 minutes at 0°C, and the reaction solution then poured into propan-2-ol. After concentration, the residue is dissolved in acetic anhydride and treated with boron trifluoride-diethyl ether complex at 0 C, to provide dibenzo[6,/]thiepin in 55 % overall yield16 (cf. Houben-Weyl, Vol. 10/4, p 834). 

Dry NH3(g) was passed into a stirred solution of 6-chloro-l l//-dibenz[6,e]azepine (13 45.6 g, 0.2 mol) in phenol (200 g) at 200 C for 6 h. The excess phenol was removed by distillation and the residue dissolved in benzene. The benzene solution was shaken with 5% aq HC1 in order to precipitate the product as the hydrochloride salt, which was collected by filtration and recrystallized from propan-2-ol as the monohydrate. On heating the monohydrate in vacuo at 110 C the anhyd hydrochloride was obtained yield 29.3 g (59%) mp 204-206 C. 

Polar organic solvents readily precipitate exopolysaccharides from solution. The solvents commonly used are acetone, methanol, ethanol and propan-2-ol. Cation concentration of the fermentation liquor influences the amount of solvent required for efficient product recovery. In the case of propan-2-ol, increasing the cation concentration can lead to a four-fold reduction in die volume of solvent required to precipitate xanthan gum. Salts such as calcium nitrate and potassium chloride are added to fermentation broths for this purpose. 

A mixture of hex-l-yne (80mmol), trichlorosilane (8ml) and a solution of H2PtCl6 in propan-2-ol (5 drops, 0.1m) was kept at 2°C for 15 h, by which time hydrosilylation was complete. Direct distillation gave a mixture of vinylsilanes (60mmol, 75%). G.l.c. indicated a 95 5 mixture of terminal internal regioisomers. 

Griffin and Albaugh [102] describe a procedure whereby the neutral AOS product is converted to the parent acids by cation exchange and then titrated potentiometrically. A dilute aqueous solution of AOS is passed through cationic ion exchange resin in acid form. The acids are eluted with small portions of water and titrated potentiometrically using tetrabutylammonium hydroxide solution in a solvent mixture of 70 30 benzene/methanol. It is probable that the benzene can be replaced with toluene for safety reasons or that ASTM titration solvent (ASTM D664 toluene/propan-2-ol/water) can be used. 

Analysis of sulfonic acid species in sulfonated olefins. Kupfer and Kuenzler [108] reported the determination of acid species following partition between a 6.5% hydrochloric acid solution in 40% ethanol and a 1 1 (v/v) propan-2-ol-hexane mixture. The organic fraction contains alkenesulfonic and hydroxy-alkanesulfonic acids and the aqueous phase disulfonic acids and sulfato-sulfonates. The monosulfonic acids were converted to methyl esters and separated by column chromatography. To determine sulfatosulfonates the aqueous fraction was hydrolyzed and then partitioned and chromatographed. The separation is controlled using IR spectroscopy. 

The procedure for determination of neutral oils in AOS measures petroleum spirit-extractable material from an aqueous alcoholic solution. Normally a solution of 1 1 ethanol/water is used as to dissolve the sample prior to extraction. For higher molecular weight materials 2 1 propan-2-ol/water is preferred. The petroleum ether is removed on a steambath and finally under vacuum. The amount of neutral oil is then determined gravimetrically. Due to the slight volatility of alkenes, alkanes, and alcohols, especially in the C,2 materials, the neutral oil tends to be underestimated by these procedures. 

The most common poly(alkenoic acid) used in polyalkenoate, ionomer or polycarboxylate cements is poly(acrylic acid), PAA. In addition, copolymers of acrylic acid with other alkenoic acids - maleic and itaconic and 3-butene 1,2,3-tricarboxylic acid - may be employed (Crisp Wilson, 1974c, 1977 Crisp et al, 1980). These polyacids are prepared by free-radical polymerization in aqueous solution using ammonium persulphate as the initiator and propan-2-ol (isopropyl alcohol) as the chain transfer agent (Smith, 1969). The concentration of poly(alkenoic add) is kept below 25 % to avoid the danger of explosion. After polymerization the solution is concentrated to 40-50 % for use. 

The formation of Au nanoparticles can be easily monitored by following the appearance of a surface plasma resonance band around 520-540 nm (Fig. 6.1). Yeung et al. [33] observed that the efficiency of gold particle formation was different in different alcohols (n-pentanol > propan-2-ol > methanol). This is due to the air/water surface activity of the alcohols and the ability of the solute to scavenge the primary OH radicals at the bubble/liquid interface. 

Fig. 6.1 Absorption spectra of gold sols generated from solutions containing 1 x 10 4 mol dm 3 AuCl,, 0.1 wt% PVP, and various concentrations of propan-2-ol [31]...

Penicillamine (50 mg) was mixed with 50 mg of formaldehyde, 50 pL of concentrated HC1, and 2.5 mL of propan-2-ol, and the solution heated at 60 °C for 2 h. An aliquot of the reaction mixture was subjected to TLC on a Chiralplate (Macherey-Nagel) with a mobile phase of methanol-H20-aeetonitrile (1 1 4). Detection was made using 0.1% ninhydrin reagent, and the limit of detection was approximately 0.5%. Good separation of (d)- and (L)-penicillamine was achieved. 

The pure product is produced by dissolving the gum from the seeds in hot water. Diatomaceous earth filtration is then used to purify the solution. As the gum is less soluble in alcoholic than aqueous solutions it is precipitated by adding propan-2-ol. The pressed filter cake is then washed in pure alcohol to dehydrate it. The alcohol is then recovered by pressing again. The pressed product is then milled to the required final size. 

Solution (1) Dilute 50 pi of anhydrous methanol (internal standard) with sufficient anhydrous propan-2-ol to produce 100 ml. 

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