✍ Scribed by G Fronza; A Gamba; R Mondelli; G Pagani
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract Carbon‐13 NMR spectra of pyridine have been observed by using the slow scan technique in the absorption mode. The long range coupling constants between carbon‐13 and protons have been obtained and assigned by the isotope substitution method.
## Abstract The ^1^H and ^13^C NMR spectra of the parent tetramethyl 9a__H__‐quinolizine‐1,2,3,4‐tetracarboxylate and 20 of its alkyl‐substituted derivatives were obtained and analysed. The study included measurements of one‐bond carbon–carbon and also proton–proton coupling constants across three,
## Abstract The application of selective population inversion (SPI) to the assignment of ^13^C resonances and to the determination of the relative sign of ^13^C^1^H coupling constants is demonstrated for 1‐phenyl‐1,2‐dibromo‐2‐nitroethane. A negative sign for the geminal C‐2H‐1 coupling constant
A new method is shown to determine C,C spin coupling constants in C 2 symmetric molecules by using proton detection with gradient selected 2QHMBC. It is shown that the pulse sequence proposed distinguishes between symmetric and antisymmetric eigenfunctions of the AAXX spin system.