1985
DOI: 10.1002/chin.198550159
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ChemInform Abstract: INFLUENCE OF GEMINAL SUBSTITUENTS ON DEHYDROGENATION OF DIHYDRO DERIVATIVES OF NITROGEN HETEROCYCLES. 2,3‐DIHYDROPERIMIDINES AND BENZIMIDAZOLINES

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“…The proton spectra of the ortho -disubstituted proton sponges due to their symmetry are quite simple, and chemical shift changes of each particular compound are generally in accord with its structure, namely, nitrogen planarization and lack of conjugation between NMe 2 groups and the ring π-system (Table ). Analysis of the NMR 1 H spectrum of 1,3-dimethyl-2,3-dihydroperimidine ( 11a ), in which the conditions for effective conjugation between the nitrogen atoms and the naphthalene system are realized in the best way, , shadows an importance of these factors.
…”
Section: Resultsmentioning
confidence: 99%
“…The proton spectra of the ortho -disubstituted proton sponges due to their symmetry are quite simple, and chemical shift changes of each particular compound are generally in accord with its structure, namely, nitrogen planarization and lack of conjugation between NMe 2 groups and the ring π-system (Table ). Analysis of the NMR 1 H spectrum of 1,3-dimethyl-2,3-dihydroperimidine ( 11a ), in which the conditions for effective conjugation between the nitrogen atoms and the naphthalene system are realized in the best way, , shadows an importance of these factors.
…”
Section: Resultsmentioning
confidence: 99%