2 (217)

Prévia do material em texto

consideration. The shift is much smaller if the functional group is attached to the carbon adjacent to the carbon attached to the hydrogen and is negligible if the functional group is further away. O OH 5 0 CI CI a) CH₃CCH₂CH₃ b) CH₃CHCH₃ c) CH₃COCH₂CH₃ d) CH₃CHCH₂ 2.2 >2.2 >0.9 >0.9 >3.3 2.0 >3.7 >0.9 >0.9 >3.0 >3.0 most downfield 14.4 The signal from Hₘ will appear as a triplet (1:2:1) because the two inner lines overlap. (This is the same result as when Hₘ is coupled to two identical hydrogens.) 14.5 position for peak in absence of and Hx coupling of Jₘₓ Hx and coupling of Hₘ and Jₘₓ 14.6 In general, the absorption peak for a hydrogen(s) that is coupled to n equivalent hydrogens is split into n+1 peaks. a)a=x=3 c) a = 3, X = 2 d) a = 5, 213