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- W2008282889 abstract "Abstract The OH proton chemical shifts are reported of dilution study of 2-methyl-6-t-butylphenol (2M6TBP) and 2,6-di-t-butylphenol (2.6DTBP), and of the 1:1 association between the phenols and hexamethylphosphoramide (HMPA) in C6H12, CCl4, CH3NO2, CH3CN and C6H6 at 25, 35 and 50°C. Also the association of the phenols with CH3NO2, CH3CN and CCl4 has been studied. The phenol OH chemical shift, δf, found by extrapolation to zero concentration, shows the highest upfield shift in benzene. Contrary, on adding HMPA, the complex OH chemical shift, δx, shows the lowest downfield shift in benzene. The Kass, δx, ΔH and ΔS values have been evaluated by using the Hiquchi plot method. Linear relationships were obtained between Δδx and ΔH, and log Kass for the system 2M6TBP/HMPA in the various solvents. Furthermore, the difference in H-bond energy of a given system in an inert solvent (C6H12) and in aprotic solvent (CH3CN), corresponds to the enthalpy of association of the given donor with CH3CN in C6H12. The Kass value for the system 2M6TBP/HMPA is 10 times greater in C6H12 than in C6H6 and CCl4, 100 times than in CH3NO2 and 300 times than in CH3CN." @default.
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- W2008282889 date "1976-01-01" @default.
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- W2008282889 title "Studies of hydrogen bonding—XXVII. NMR studies of hydrogen bonding and solvent effect" @default.
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- W2008282889 doi "https://doi.org/10.1016/0584-8539(76)80140-7" @default.
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