1NMR-4の問いの回答例


カルボンのカーボン多重度の区別

δ(ppm)分類
199.4C
146.5C
144.4CH
135.2C
110.3CH2
42.9CH2
42.3CH
31.0CH2
20.3CH3
15.5CH3
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多置換ベンゼンのカーボンケミカルシフト計算

o-クレゾール

C1
(基準値)+(-OHのZ1)+(-CH3のZ2) =128.5+26.9+0.6=156.0 (ppm)
C2
(基準値)+(-OHのZ2)+(-CH3のZ1) =128.5-12.7+9.3=125.1 (ppm)
C3
(基準値)+(-OHのZ3)+(-CH3のZ2) =128.5+1.4+0.6=130.5 (ppm)
C4
(基準値)+(-OHのZ4)+(-CH3のZ3) =128.5-7.3+0.0=121.2 (ppm)
C5
(基準値)+(-OHのZ3)+(-CH3のZ4) =128.5+1.4-3.1=126.8 (ppm)
C6
(基準値)+(-OHのZ2)+(-CH3のZ3) =128.5-12.7+0.0=115.8 (ppm)

m-クレゾール

C1
(基準値)+(-OHのZ1)+(-CH3のZ3) =128.5+26.9+0.0=155.4 (ppm)
C2
(基準値)+(-OHのZ2)+(-CH3のZ2) =128.5-12.7+0.6=116.4 (ppm)
C3
(基準値)+(-OHのZ3)+(-CH3のZ1) =128.5+1.4+9.3=139.2 (ppm)
C4
(基準値)+(-OHのZ4)+(-CH3のZ2) =128.5-7.3+0.6=121.8 (ppm)
C5
(基準値)+(-OHのZ3)+(-CH3のZ3) =128.5+1.4+0.0=129.9 (ppm)
C6
(基準値)+(-OHのZ2)+(-CH3のZ4) =128.5-12.7-3.1=112.7 (ppm)

p-クレゾール

C1
(基準値)+(-OHのZ1)+(-CH3のZ4) =128.5+26.9-3.1=152.3 (ppm)
C2, C6
(基準値)+(-OHのZ2)+(-CH3のZ3) =128.5-12.7+0.0=115.8 (ppm)
C3, C5
(基準値)+(-OHのZ3)+(-CH3のZ2) =128.5+1.4+0.6=130.5 (ppm)
C4
(基準値)+(-OHのZ4)+(-CH3のZ1) =128.5-7.3+9.3=130.5 (ppm)

バニリン

C1
(基準値)+(-CHOのZ1)+(-OCH3のZ3)+(-OHのZ4) =128.5+9.0+0.9-7.3=131.1 (ppm)
C2
(基準値)+(-CHOのZ2)+(-OCH3のZ2)+(-OHのZ3) =128.5+1.2-14.7+1.4=116.4 (ppm)
C3
(基準値)+(-CHOのZ3)+(-OCH3のZ1)+(-OHのZ2) =128.5+1.2+30.2-12.7=147.2 (ppm)
C4
(基準値)+(-CHOのZ4)+(-OCH3のZ2)+(-OHのZ1) =128.5+6.0-14.7+26.9=146.7 (ppm)
C5
(基準値)+(-CHOのZ3)+(-OCH3のZ3)+(-OHのZ2) =128.5+1.2+0.9-12.7=117.9 (ppm)
C6
(基準値)+(-CHOのZ2)+(-OCH3のZ4)+(-OHのZ3) =128.5+1.2-8.1+1.4=123.0 (ppm)
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