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- W2059370462 abstract "The electron ionization mass spectra of five series of seven 2-aryl,4-R-substituted (R = Me, Et, i-Pr, t-Bu or Ph) 3,4,5,6-tetrahydro-2H-1,3-oxazines were recorded at 14 and 70 eV in order to study the ring-chain tautomeric equilibria in the gas phase. Certain fragment ions were associated with the ring or with the open-chain forms of the compounds. As in chloroform solution, the electron-withdrawing effect of the aryl substituent (p-NO2, m-Br, p-Cl, H, p-Me, p-OMe and p-NMe2) shifts the equilibrium towards the ring form. The correlation of ring-chain equilibria (log K = [ring]/[chain]) with the Hammett σ+ constants of the aryl substituents was in general good or satisfactory although in some cases the p-NMe2 did not fit these correlations. Copyright © 2007 John Wiley & Sons, Ltd." @default.
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- W2059370462 date "2007-01-01" @default.
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- W2059370462 title "Substituent effects on the gas-phase ring-chain tautomerism of 3,4,5,6-tetrahydro-2H-1,3-oxazines" @default.
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- W2059370462 doi "https://doi.org/10.1002/rcm.3260" @default.
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