Infrared spectra of ethers

Infrared The infrared spectra of ethers are characterized by a strong rather broad band due to antisymmetric C—O—C stretching between 1070 and 1150 cm Dialkyl ethers exhibit this band consistently at 1120 cm as shown m the IR spectrum of dipropyl ether... 

Fig. 7. Infrared spectra of etherate 1443 and 1444 of aluminum hydride. Top Taken sometime in 1961. Bottom Example of other phase.

J. Arnold, D. J. Millen. Hydrogen bonding in gaseous mixtures. Part n. Infrared spectra of ether-hydrogen fluoride systems. J Chem Soc 503-509, 1965. 

The infrared spectra of l,4-anhydro-3,5-0-methylene- and -2-0-methyl-DL-xylitol have been studied.60 The 2-methyl ether was obtained by converting l,4-anhydro-3,5-0-methylene-DL-xylitol into its monomethyl ether, and then hydrolyzing off the methylene group. A methyl ether prepared from the known l,4-anhydro-3,5-0-isopro-pylidene-2-O-methyl-DL-xylitol proved to be identical with this compound, thus establishing at the same time that the methylene group in the known acetal is attached to 0-3 and 0-5 of 1,4-anhydro-DL-xylitol. The methylene group, having a 1,3-dioxolane structure, was characterized by an absorption band at about 2800 cm 1. 

The infrared spectra of adrenochrome, adrenochrome methyl ether, and 7-iodoadrenochrome in the solid state (Nujol mulls) have... 

The spectroscopic properties of ethers are unexceptional. Like alcohols, they have no electronic absorption beyond 185 nm the important infrared bands are the C—O stretching vibrations in the region 1000-1230 cm-1 their proton nmr spectra show deshielding of the alpha hydrogens by the ether oxygen (6Hcaoc 3.4 ppm). The mass spectra of ethers and alcohols are very... 

The ether extract of cane molasses yields an acidic substance with the characteristic odor of raw sugar.128 The steam distillation of molasses is stated to yield a rum oil. 129 Fractionation of cane final molasses on fuller s earth clay produces a concentrate with a strong molasses odor.70 The infrared spectra of the volatile portion of this concentrate indicated the absence of hydroxyl and carbonyl and the presence of a substituted benzene structure, of paraffinic methylene and methyl groups, of an acetate group, and of the > C=C < and —C=C— linkages. The presence of a sulfur function is probable. Further chromatography indicated complexity in this volatile concentrate.180... 

Infrared Spectroscopy of Ethers Infrared spectra do not show obvious or reliable... 

CXE2C1, C1E3C1, and CXE4C1 were commercially supplied, while CxEsCx and CxEgCx were prepared by the Williamson ether synthesis. The infrared spectra of aqueous solutions of these compounds were measured for various concentrations at room temperature by using a horizontal ATR accessory with a ZnSe prism. Tibe lowest concentration studied was a mole fraction of approximately 0.005. The spectra were recorded on a JASCO FT/IR-7300 spectrometer. Each of the spectra was obtained by the coaddition of 200 scans at a resolution of 4... 

The stoichiometry of the crystalline complex obtained by reaction of cyclic oligoolefins with AuCl in absolute ether at room temperature (0°C for norbornadiene) depends upon the olefin. 1,5-Cyclooctadiene and both cis,cis,trans- and oif-infrared spectra of the trienes indicate the presence of both complexed and free double bonds, the cis,cis,trans-l,5,9-cyc odo-decatriene showing one free cis unsaturation. C is,cyclodeca-diene and dicyclopentadieneform, on the other hand, only 1 1 complexes. The former olefin is complexed only at the trans double bond, whereas the latter is complexed only at the double bond in the norbomene part of the molecule (225). 

Figure 17.1. Infrared spectra of (a) n-propyl ether and b) phenetole.

Figure 9.1 5 The infrared spectra of 2-butanol green) and diethyl ether red).

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