Partial Structures When analyzing proton NMR spectra (and later 2D spectra), we will refer to part structures/spin syste

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Partial Structures When Analyzing Proton Nmr Spectra And Later 2d Spectra We Will Refer To Part Structures Spin Syste 1 (33.7 KiB) Viewed 14 times

Partial Structures When analyzing proton NMR spectra (and later 2D spectra), we will refer to part structures/spin systems. O b C a For example, consider 3-heptanone: Protons a, b, c and d constitute one spin system, an unbroken network of coupled protons. The ethyl group, e and f, constitutes a second, separate spin system, because there is no coupling between a and e, across the carbonyl PPM • Complete the following table: Shift Designation Partial Structure (ppm) .9 CH-CH₂ f CH₂CH₂ CH3CH2CH2 CH₂-CH₂-CH₂ COCHCH3 CƠ - CHÍ CH3 1.1 1.4 1.6 2.4 2.45 Integration Multiplicity 3H t 3H 2H 2H 2H I 1 5 t 9 C b a c