Ethylene oxide dipole moment

Ethers like water and alcohols are polar molecules Diethyl ether for example has a dipole moment of 1 2 D Cyclic ethers have larger dipole moments ethylene oxide and tetrahydrofuran have dipole moments m the 1 7 to 1 8 D range—about the same as that of water (1 8D)... 

View molecular models of dimethyl ether and ethylene oxide on Learning By Modeling Which one has the greater dipole moment Do the calculated dipole moments bear any relation ship to the observed boiling points (ethylene oxide +10°C dimethyl ether —25°C) d... 

Ethylene, /3-(dimethylamino)-nitro-in pyrrole synthesis, 4, 334 Ethylene, dithienyl-in photochromic processes, 1, 387 Ethylene, furyl-2-nitro-dipole moments, 4, 555 Ethylene, l-(3-indolyl)-2-(pyridyl)-photocyclization, 4, 285 Ethylene, l-(2-methyl-3-indolyl)-l,2-diphenyl-synthesis, 4, 232 Ethylene, (phenylthio)-photocyclization thiophenes from, 4, 880 Ethylene carbonate C NMR, 6, 754 microwave spectroscopy, 6, 751 photochemical chlorination, 6, 769 synthesis, 6, 780 Ethylene oxide as pharmaceutical, 1, 157 thiophene synthesis from, 4, 899 Ethylene sulfate — see 2,2-dioxide under 1,3,2-Dioxathiolane... 

Sharp and Walker (36) have reported good linear plots of Mx - Mh for 3- and 4-substituted pyridines, pyridine-N-oxides and nitrobenzenes against the appropriate substituent constants. Charton (37) has reported correlations of dipole moments for substituted ethylenes and related compounds with eq. (1) using the oj, and Op constants. Best results were generally obtained with Op. 

Mean-square dipole moments of polylthiodiethylene gycol), an alternating copolymer of ethylene oxide and ethylene sulfide, are determined from dielectric constant measurements on dilute solutions of the polymer in benzene. Since the configuration-dependent properties of one of the parent homopolymers, PES, are unknown, because of its insolubility in ordinary solvents, the results are preferably compared with those of POE chains. It is found that the dipole moments of polylthiodiethylene glycol) are somewhat larger than those of POE. 

The dipole moment of ethylene oxide is the result of non-uniform electron distribution in o-bonds, and is caused by the presence of an... 

Molecular orbital computational analysis by PM3 CI UHF semiempirical methods have been used to support the contention that preferable HSOMO-LUMO interactions produce a favored biradical and explain the site selectivity in the sensitized photochemical [2 + 2] cycloadduct formation of 2-pyrones with electron-deficient ethylenes <92BCJ354>. The lowest ionization energies, dipole moment, and dominant electronic configurations of a 5-methylidenated version of 7-nitroso-oxazolo[4,5- ]cyclopenta[e]pyrimidine of unknown origin were calculated by the ADC(3) ab initio method <92CPHii>. An extensive semiempirical and ab initio investigation into the mechanism of oxidation of methanol by PQQ is cited in Section 7.22.12.4. 

My own criterion for evaluating charge density results is to compare the electrostatic physical properties with other experiments.28 1 tried to work up the numbers reported by Matthews et al.21 for a permanent dipole moment, but the information is insufficient since the local atomic axes are not reported. A coordinate system, defined with respect to the unit cell axes, should be supplied moreover, it is convenient for the reader if all population coefficients are rotated into this defined system. Of course, if rotational invariance is violated in the representation, then there is no sense to any of the results. I was also interested in determining the local electric field gradients on the N atoms of the tetracyano-ethylene oxide molecule, but the authors have prejudged the result by arbitrarily setting three of the five local quadrupole terms to zero. 

Ethanediol. See Ethylene glycol Ethanoic acid. See Acetic acid Ethanol, 128, 130, 580-581 acidity of, 135, 740-741 and benzaldehyde, acetal from, 669 biological oxidation of, 600—602 chemical shifts, 606 conversion to diethyl ether, 592 dehydration of, 182 dipole moment of, 130, 863 by fermentation, 580-581 hydrogen bonding in, 130-131 industrial preparation of, 223, 581 physical properties of, 130, 132-133, 580 reduction of aryl diazonium salts by, 894, 907... 

The photoisomerization of the stilbene chromophore in an amphiphilic diblock copolymer constructed from dialkoxycyanostilbene polymethacrylate and poly(ethylene oxide) upon UV irradiation resulted in the destruction of the self-assembled superstructure, which hindered selfaggregation and the higher dipole moment of the (Z)-stilbene moiety led to a reduction of the hydrophobic nature. 

Experimental measurements of the dipole moment and its temperature coefficient of the polyoxides poly(trimethylene oxide) polyftetramethylene oxide) and poly(decamcthylene oxide), and poly(l,3-dioxolane) are in general agreement with estimates obtained by rotational isomeric state treatments. In the latter case, an alternating copolymer of formaldehyde and ethylene oxide, the appropriate intramolecular interactions were obtained from studies of the homopolymers the matrix calculation provides the proper statistical mechanical average, in contrast to simply taking a mean. 

Rationalize the differences between the following dipole moments for water, dimethyl ether, and ethylene oxide (oxirane) ... 

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