Question & Answer: Using Table 13-3, predict the chemical shifts of the protons in the following compounds TABLE…..

Using Table 13-3, predict the chemical shifts of the protons in the following compounds TABLE 133Typical Values of Chemical Shifts (a) CH3 C OH (b) CI-CH2 CH CH3 (c) (CH33CCH CH2 Type of Proton Approximate δ Type of Proton Approximate δ alkane (CH3) 0.9 methyl allylic CH alkane (-CH,–) Ph-H aromatic 7.2 methylene Ph-CH3 benzylic 2.3 alkane (-CH- methine 9-10 R-C-H aldehyde -C CH3 methyl ketone R-C-OH 10-12 2.5 acid acetylenic R-OH alcohol variable, about 2-5 3-4 R-CH2-X (X halogen, O) variable, about 4-7 Ar-OH phenol 5-6 R-NH2 variable, ab15-4 viny amine Note: These values are approximate, as all chemical shifts are affected by neighboring substituents. The numbers given here assume that alkyl groups are the only other substituents present. A more complete table of chemical shifts appears in Appendix l