Propanol spectrum

This point is well illustrated with a spectrum of 3-fluoro propanol (Spectrum 6.10), which shows a fairly dramatic example of fluorine coupling. The F-CH2- coupling is about 47 Hz, and the F-CH2-CH2- coupling, is 27 Hz. The coupling to the third methylene group is non-existent in this example but can be seen sometimes (0-3 Hz). 

Does the NMR spectrum shown in Figure 22 10 correspond to that of 1 amino 2 methyl 2 propanol or to 2 ammo 2 methyl 1 propanoD Could this compound be prepared by reaction of an epoxide with ammonia" ... 

Figure 17.13 H NMR spectrum of 1-propanol. The protons on the oxygen-bearing carbon are split into a triplet at 3.58 6.

Methyl-l-propanol, l3C NMR spectrum of. 453 2-Methylpropene, heat of hydrogenation of. 187 Mevalonate, decarboxylation of, 1075 isopentenyl diphosphate from, 1072-1075... 

Figures 15 and 16 demonstrate folding in the l,l,l,3,3,3-hexafluoro-2-propanol/ethylene glycol (HFP/EG) mixture (1 2) and in 1,3-propandiol in comparison to Fig. 13, which describes helix formation in water. The structure formation is much more pronounced. This is indicated by the more negative signals of the CD spectrum at 198 nm. The negative values of 0 for the octamer increase from -1.8 x 10-4 deg cm2 dmol-1 in...

The polymer = 8.19 dlg in hexafluoro-2-propanol, HFIP, solution) in Figs 1 and 2 is prepared on photoirradiation by a 500 W super-high-pressure Hg lamp for several hours and subjected to the measurements without purification. The nmr peaks in Fig. 1 (5 9.36, 8.66 and 8.63, pyrazyl 7.35 and 7.23, phenylene 5.00, 4.93, 4.83 and 4.42, cyclobutane 4.05 and 1.10, ester) correspond precisely to the polymer structure which is predicted from the crystal structure of the monomer. The outstanding sharpness of all the peaks in this spectrum indicates that the photoproduct has few defects in its chemical structure. The X-ray patterns of the monomer and polymer in Fig. 2 show that they are nearly comparable to each other in crystallinity. These results indicate a strictly crystal-lattice controlled process for the four-centre-type photopolymerization of the [l OEt] crystal. 

Figure 45.3 ATR difference spectrum of catalyst thin-film on ZnSe crystal in contact with 2-propanol (a) 2-propanol, (b) Pd/Ti02 catalyst, (c) Pd/Al203 catalyst, and (d) Au/Ti02 catalyst. The difference spectra were obtained by subtracting the single beam spectra at time 0.00 min.

Powerful evidence for the intermediacy of a metaphosphorimidate of type 189 nevertheless comes from the product spectrum obtained on reaction of 202 with KOH in ethanol or propanol. The principal products dimethyl sulfide and potassium O-ethyl (or propyl) phosphoramidate can be readily rationalized in terms of the reaction sequence presented in the Scheme 138). 

Hexafluoro-wo-propanol has become a popular solvent. Its fluorine, proton, and carbon spectra are provided in Figs. 6.15-6.17. The doublet in the fluorine spectrum centered at -77.1 ppm exhibits a three-bond... 

Diphenoxy-2-propanol (3) was prepared from phenol and epichlorohydrin (l-chloro-2,3-epoxypropane), as previously described,8 and recrystallized three times from 2-propanol to yield white crystals, m.p. 82-82.5°C. The nmr spectrum in CDC1- (Varian EM-390 spectrometer) exhibited resonances (in ppm (6) relative to tetramethylsilane) at 3.0 (1H, doublet,... 

When acridane 1 is oxidized by dibenzoyl peroxide in propanol/ water in acid or neutral medium, there occurs chemiluminescence whose emission spectrum matches the fluorescence spectrum of acridinium cation (protonated acridine) 2. As radical scavengers have no influence... 

Figure 8. IR and Raman OH stretching spectra of n propanol monomers and dimers reflecting conformational diversity. The Raman spectrum reveals the dominance of the internally hydrogen bonded Gt monomer most clearly, whereas the IR spectrum indicates more than five different dimer conformations in the red shifted dimer spectrum [69].

Beyond ethanol, the number of ft-alkanol dimer conformations becomes too large to be vibrationally resolved, even in supersonic jets. For -propanol, more than five isomers are discernible in the donor O—H stretching spectrum (see Fig. 8). For longer chains, there is a smaller number of dominant conformations [69]. Ar relaxation shows that the most stable -propanol and n-butanol dimers are those with the largest observed red shifts. For longer chains, the situation is more complex. However, the window of observed O—H stretching bands is quite independent of chain length beyond propanol. 

The shift of the fluorescence spectrum as a function of time reflects the reorganization of propanol molecules around the excited phthalimide molecules, whose dipole moment is 7.1 D instead of 3.5 D in the ground state (with a change in orientation of 20°). The time evolution of this shift is not strictly a single exponential. 

The mass resolved lcR2PI spectrum of the bare chiral chromophore Cr = (R)-(+)-l-phenyl-1-propanol, shows three intense signals at 37577 (A), 37618 (B), and 37624 cm (C) in the electronic Sj — Sq band origin region. A similar triplet falls at 38106, 38148, and 38155 cm . This pattern is common to substituted arenes and is interpreted as due to three stable conformers. Quantum chemical calculations at the RF1F/3-21G and B3LYP/6-31G levels of theory confirm this hypothesis. 

Fig. 10 Mass resolved lcR2PI excitation spectrum of (a) the bare (R)-(+)-l-phenyl-1-propanol (C ) (b) the cluster (c) the cluster (d) the cluster...

Fig. 6.8. El mass spectrum of 1-propanol. Used by permission of NIST. NIST 2002.

Fig. 11.25. Negative-ion ESI spectrum of an industrial cooling lubricant dissolved 1 1000 in 1-propanol. The dominant ions belong to aUcylbenzene sulfonates. The inset expands the mJz 420-555 range, the most intensive peaks belonging to saturated alkyl chains. By courtesy of OMTEC GmbH, Eberbach.

Electron transfer [Eq. (1)] would occur at a rate near the diffusion limit if it were exothermic. However, a close estimate of the energetics including solvation effects has not been made yet. Recent support of the intermediacy of a charge transfer complex such as [Ph—NOf, CP] comes from the observation of a transient (Amax f 440 nm, t =2.7 0.5 ms) upon flashing (80 J, 40 ps pulse) a degassed solution (50% 2-propanol in water, 4 X 10 4 M in nitrobenzene, 6 moles 1 HCl) 15). The absorption spectrum of the transient is in satisfactory agreement with that of Ph—NO2H, which in turn arises from rapid protonation of Ph—NOf under the reaction conditions ... 

The simplest method is probably colorimetric, based on its electronic spectrum [215], It can also be determined gravimetrically by addition of diphenylsulfide or ethanol to a solution of RuO this gives RuO which is then reduced to the metal [236], Alternatively addition of 2-propanol to a solution of RuO solution generates RuO. nHp [237],... 

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