The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Analysis of A2B2 N.M.R. [nuclear magnetic resonance] spectra. II. Nonsymmetrical 1,2-disubstituted ethanes》. Authors are Hirst, Robert C.; Grant, David M..The article about the compound:2-Chloroethyl acetatecas:542-58-5,SMILESS:CC(OCCCl)=O).Category: chiral-catalyst. Through the article, more information about this compound (cas:542-58-5) is conveyed.
cf. CA 58, 4067e. The features of A2B2 proton magnetic resonance spectra of nonsym. 1,2-disubstituted ethanes are discussed in detail. Under certain conditions the magnitudes and signs of all the coupling constants can be obtained for this type of A2B2 spectra. Typical calculated spectra along with several exptl. spectra are given to illustrate these conditions. With one exception, exptl. data are given only for mols. for which all 4 of the coupling constants are obtained. The geminal coupling constants are of opposite sign from the rotationally averaged values for the vicinal couplings. The values of the geminal couplings are approx. those found by other workers in the corresponding monosubstituted methanes. Small vicinal substituent effects on the geminal coupling constants are reported for several of the substituent groups. The assignment of the chem. shift of the particular methylene group is based on the comparison of the A2B2 chem. shifts with the chem. shifts in the related ethyl compounds.
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