Isopropanol, infrared

A mixture of 2.0 g (0.064 mol) of 2-fluoromethyl-3-(o-tolyl)-6-nitro-4(3H)-qulnazolinone, Oi g of 5% palladium-carbon and 100 ml of acetic acid is shaken for 30 minutes in hydrogen gas. The initial pressure of hydrogen gas is adjusted to 46 lb and the mixture is heated with an infrared lamp during the reaction. After 30 minutes of this reaction, the pressure of hydrogen gas decreases to 6 lb. After the mixture is cooled, the mixture is filtered to remove the catalyst. The filtrate is evaporated to remove acetic acid, and the residue is dissolved in chloroform. The chloroform solution is washed with 5% aqueous sodium hydroxide and water, successively. Then, the solution is dried and evaporated to remove solvent. The oily residue thus obtained is dissolved in 2 ml of chloroform, and the chloroform solution is passed through a column of 200 g of silica gel. The silica gel column is eluted with ethyl acetate-benzene (1 1). Then, the eluate is evaporated to remove solvent. The crude crystal obtained is washed with isopropylether and recrystallized from isopropanol. 0.95 g of 2-fluoromethyl-3-(o-tolyl)-6-amino-4(3H)-quinazolinone Is obtained. Yield 52.5% MP 195°-196°C. 

The STG was cast from alx 10 3 M solution into which the mirror had been immersed for from 10 to 20 min (see Appendix 1). The presence of a monolayer was confirmed by ellipsometry (18 A). The spectral data agreed with data gathered on a similar system in a powder form. In this case, CuzO powder was immersed in a 0.01 M solution of isooctyl thioglycolate (OTG) in isopropanol for from 1 to 10 min, washed with pure isopropanol, dried in air, and analyzed via infrared transmission in a KBr dispersion pellet (see Appendix 2). A similar spectral shift of approximately 15 cm 1 (1739— 1724 cm-1) was observed and the lack of two distinct carbonyl absorbances suggested the formation of a monolayer. In both cases, the formation of a copper-mercaptoester salt may be responsible... 

Fundamental studies by reflection angle infrared spectroscopy of the bonding of EME coupling agents to metal oxides reveal a significant shift in the carbonyl absorbance band when the coupling agent is applied as a very thin layer on a metal oxide. The shift is reproducible and the extent varies with the type of oxide. These results were obtained both by use of copper mirrors and from CuzO powder coated with very thin layers of model compounds. The compounds were not removable by isopropanol, a solvent for the bulk compound. The thiol absorbances of thin layers of model compounds were also found to decrease in relative intensity with time. This illustrates that a specific chemical interaction has occurred. 

Each oxide powder was washed copiously with pure isopropanol, dispersed in a KBr pellet, and analyzed via infrared transmission for organic contaminants and to obtain reference spectra of the blank oxides. The washed powders were then air-dried and placed aside in a desiccator. Next, 500 ml of 0.01 M solution of isooctyl thioglycolate (OTG) in isopropanol was prepared and 15 ml glass vials were then filled with approximately 0.50 g of each powder. This was followed by the addition of about 10 ml of the OTG solution to each vial. The vials were then seated and agitated for about 10 min. This... 

Identification The volatile oil distilled from an oleoresin is similar in its physical and chemical properties, including its infrared spectrum, to that distilled from the spice of the same origin. To obtain the volatile oil from the oleoresin, proceed as directed under Volatile Oil Content, Appendix VHI. Residual Solvent Chlorinated Hydrocarbons (total) Not more than 0.003% Acetone Not more than 0.003% Isopropanol Not more than 0.003% Methanol Not more than 0.005% Hexane Not more than 0.0025%. 

The parameters, which should be determined are the concentration of NH3, NO, O2, SO2, SO3, and H2O, the catalyst surface area, gas velocity, and the temperature. The analyzing equipment for NO is UV absorption, for NH3 an ion selective electrode, and for SO2 infrared spectroscopy. SO3 is absorbed in isopropanol and then determined titrimetrically [128]. 

When polyvinylbenzophenone is irradiated at 365 nm in benzene solution containing 0.1 mole l1 isopropanol, photoreduction occurs as demonstrated by the formation of acetone and the disappearance of the carbonyl absorption in the infrared spectrum [65]. The reaction is assumed to proceed by a mechanism similar to that of the photoreduction of benzophenone, which involves the excited triplet state of the ketone ... 

Blanco, M., Castillo, M. and Beneyto, R. (2007) Study of reaction processes by in-line near-infrared spectroscopy in combination with multivariate curve resolution Esterification of myr-istic acid with isopropanol. Talanta, 72 (2), 519-525. 

Finally, laser pyrolysis of Fe(CO)s produces partially or fully oxidized Fe nanoparticles of 20 nm mean diameter using an infrared laser in mixtures containing SF. A similar procedure carried out in isopropanol produced 5 nm nanoparticles of 7-Fc203. ... 

Zaki, M Hu.s.sein, G El Ammawy, II Mansour, S Polz, J Kndzinger, H, Effect of foreign ion additives on ceria surface reactivity towards isopropanol adsorption and dccompt)sition an infrared investigation. Journal of Molecular Catalysis., 1990 57, 367-378. 

Fig. 18.14. Infrared spectrum of expired air after ingestion of isopropanol. Isopropanol (i-Pr) and its metabolite. acetone (A) are quantitatively identified. (Stewart and Erley. 1965.)...

Owrutsky and co-workers studied MnjCCO), with infrared detection and photolysis at 310 and 400 nm. In the first study, they note that the extraction of lifetimes is complicated by vibrational relaxation processes which occur on the 50-ps time scale, and that no bridged species is observed in isopropanol. This may be due to complexation of Mn2(CO)j by the solvent. For the longer wavelength irradiation, Mn(CO)5 is the only product and its vibrational relaxation times were estimated to be the same, within experimental uncertainty, in cyclohexane and isopropanol. None of these studies suggest any solvento complexes for the Mn(CO)5 species. 

Fig. 7. Short-wavelength near-infrared spectra for selected hydrocarbons and water. 1, Acetone 2, cyclohexane 3, ethylbenzene 4, gasoline with added ethanol 5, isopropanol 6, tert-butyl methyl ether 7, -decane 8, n-heptane 9, pentane 10, p-xylene 11, tcrt-butanol 12, toluene 13, trimethyl pentane 14, water.

Hasan, M.A, Zaki, M.I., and Pasupulety, L. A spectroscopic investigation of isopropanol and methylbutynol as infrared reactive probes for base sites on polycrvstaUine metal oxide surfaces. J. Mol Catal A Chem. 2002, 178, 125-137. 

Photoacoustic Fourier transform infrared (FTIR) spectroscopy studies performed by Moffat and coworkers [33] on Ci to C4 alcohols adsorbed over phospho-tungstic Keggin acidH3PWi2O40, demonstrated the formation of alkoxyl intermediates. The authors observed the chemisorption of 3-4 isopropanol molecules per Keggin anion after 5 to 10 h of exposure to the alcohol at 25°C. The alcohol initially adsorbs as a protonated species /-C3H7OHJ and forms isopropoxyl species upon evacuation at about 50°C. 

Preferential formation of 1,2-nitrosochlorides. A soln. of coned. HCl in isopropanol and a coned, aq. soln. of NaNO added simultaneously below 10° to a soln. of (+)-limonene in isopropanol, stirred for an additional 15 min., and allowed to stand 1 hr. in the refrigerator limonene nitrosochloride (Y 80.7% the amount of acid, 33-50 ml. per 0.1 mole olefin, is critical) refluxed 30 min. with dimethylformamide in isopropanol until the rotation is constant carv-oxime (Y 83.5%) melted in a separatory funnel by means of an infrared lamp, added dropwise to boiling aq. H2SO4 at pH 0.8, the product steam-distilled out of the reaction mixture as rapidly as it is formed and isolated in a continuous separator while the condensate water is returned to the still pot and dil. H2SO4 added portionwise to maintain the pH at 0.7-0.9 carvon (Y 83%). R. H. Reitsema, J. Org. Chem. 23, 2038 (1958). 

Figure 1 Effect of H-bonding on the 0-H stretching vibration of isopropanol. Reproduced with permission from Colthup NB, Daly LH and Wiberley SE (1975) Introduction to Infrared and Raman Spectroscopy. New York, San Francisco and London Academic Press.

---