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The  1 H NMR spectra of quinazoline-disulfide (8) and some known quinazolines (8, 7a, 7b) were analyzed by the combination of spin decoupling experiments and simultaneous addition of Eu(fod) 3 . Under the assumption of an independent 1:1-complex formation of both quinazoline-nitrogens with the shift reagent (i.e. the 1: 2-complex concentration is negligible) there exists a linear dependence between the chemical shift of different protons within one compound. The slopes of corresponding protons of 8 differ from those of 3, 7a, 7b due to steric effects.

zeitschrift für naturforschung b

Über die Anwendung von NMR-Verschiebungsreagenzien zur Strukturaufklärung von Chinazolinderivaten.: Application of NMR Shift Reagents for Structure Determination of Quinazoline Derivatives