Solutions_Manual_for_Organic_Chemistry_6th_Ed 298

Solutions_Manual_for_Organic_Chemistry_6th_Ed 298 - 1 3-39...

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Unformatted text preview: 1 3-39 c ontinued (d) 12 2H � IH f! IH The NH2 g roup shields nearby protons on benzene. 6 I I I I I ���� H b N H2 5 8 ( ppm) 4 b H d N H2 g 4H v ery broad and variable TMS I I 10 9 8 I 7 I I I I 3 2 o ( e) 12 2H aH 02N 2H f! * � ;) 5 8 ( ppm) I Hb O-C � IH / � d C H1 g 6H C C H3 d aH Hb 10 I 9 I 8 I 7 I 6 I ,I I 4 I II (To show the pattern of peaks, this multiplet is larger than it would appear on a real spectrum.) I I I TMS 3 2 1 o I I (f) S ignal (a) is split into a quartet because of the adjacent CH3 with J 7 Hz. Each of those peaks is then split into a doublet because of the coupling with the trans H, J 15 Hz. This is called a doublet of quartets, and it is drawn here as two quartets . In a real spectrum, these peaks would overlap and would not be a c lean doublet of quartets. See the splitting tree for problem = = d H 3C 13-15. f! IH . 12 , I V � bH 4 I I C C H3 3I � g 3H TMS I III 10 I 9 I 8 I 7 I 6 I I 5 8 ( ppm) 2 91 3 2 I I I o I ...
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