1966
DOI: 10.1021/ja00954a006
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Abstract: C13 chemical shifts of the carbonyl group of acetic acid were determined in the solvents water, acetone, chloroform, and cyclohexane over the range of volume fractions of acetic acid from 1.0 to about Relatively large dilution effects on the C13 shifts were observed with acetone as solvent, a smaller effect with chloroform, and only small effects in water or cyclohexane as solvents. A curious hump was found in the water dilution curve. These results are understandable in terms of the influences of making and/o… Show more

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Cited by 53 publications
(15 citation statements)
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References 8 publications
(9 reference statements)
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“…1 (30); this is consistent with the notion that 3 is reasonably strongly polarized although less so than the dimer, 1. In summary, these results are comparable to those found by Maciel and Traficante (30) in their detailed examination of the solvent dependence of the acetic acid carboxyl shielding and may be interpreted in a similar manner.…”
Section: C-2supporting
confidence: 88%
See 1 more Smart Citation
“…1 (30); this is consistent with the notion that 3 is reasonably strongly polarized although less so than the dimer, 1. In summary, these results are comparable to those found by Maciel and Traficante (30) in their detailed examination of the solvent dependence of the acetic acid carboxyl shielding and may be interpreted in a similar manner.…”
Section: C-2supporting
confidence: 88%
“…1 (30); this is consistent with the notion that 3 is reasonably strongly polarized although less so than the dimer, 1. In summary, these results are comparable to those found by Maciel and Traficante (30) in their detailed examination of the solvent dependence of the acetic acid carboxyl shielding and may be interpreted in a similar manner. There is the additional feature that the a-olefinic carbon shieldings are also expected (4,25) to reflect variations in the polarization of the carboxyl function as observed.…”
Section: C-2supporting
confidence: 88%
“…1), it is likely that the pK a of 6.73 Ϯ 0.17 is from His-130 of sTnI(115-131). In addition, it has been shown that the direction of the 13 C-carbonyl chemical shift is correlated to hydrogen bonding (46,47). Hydrogen bonding to the carbonyl results in an increase in the polarity of the carbonyl bond, which causes a decrease in the shielding of the 13 C-carboxyl nucleus and an increase in its chemical shift.…”
Section: Resultsmentioning
confidence: 99%
“…This sort of orientation was proposed by Dannhauser and Flueckinger (35) with their dielectric study of some nitriles. This explains the downfield 13 C shift of the carbonyl and nitrile7 groups in terms of the electric field effect. *…”
Section: --89mentioning
confidence: 88%
“…The sensitivity of the chemical-shift displacement due to a slight variation of electron distribution is significantly enhanced by a contribution of the paramagnetic current around the heteroatom under consideration. Therefore, if adequate accuracy of the chemicalof data using this method have been accumulated (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14).…”
Section: Introductionmentioning
confidence: 99%