The relative chemical shifts of the doublet and triplet of 1,1,2-trichloroethane (Fig. 9.4) and 1,1,2,3,3-pentachloropropane (Fig. 9.12) are reversed. Explain this.

Fig. 9.4

Fig. 9.12

Transcribed Image Text:

2H (a) A doublet: H. (b) CI-C-CHCI Splitting by one hydrogen on an adjacent carbon (b) A triplet: Splitting by two hydrogens on an adjacent carbon CI TMS (b) (a) 1H (a) 5.8 5.7 4.0 3.9 8. 7 4. đH (ppm) FIGURE 9.4 The 'H NMR spectrum of 1,1,2-trichloroethane. Zoomed-in expansions of the signals are shown in the offset plots.