Shifts and Signals

• O-H and N-H absorb at 3400
• sp3 C-H absorbs at 3000-2850
• sp2 C-H absorbs at 3100-3000
• sp C-H absorbs at 3300
• C-C and C-N triple bonds absorb at 2100
• C-O double bonds absorb at 1700
• C-C double bonds and aromatic C-C absorbs at 1600
• The shift for methyl 0.9
• The shift for methylene is 1.2
• The shift for methine is 1.7
• The effect on alpha protons from the oxygen of an alcohol or either is +2.5
• The effect on alpha protons from the oxygen of an ester is +3
• The effect on alpha protons from a carbonyl group is +1
• The shift of an allylic H is 2
• The shift of an alkynyl is 2.5
• The shift of aromatic methyl is 2.5
• The shift of alkyl halide is 2-4
• The shift of alcohol is 2-5
• The shift of a vinylic proton is 4.5-6.5
• The shift of an aryl is 6.5-8
• The shift of an aldehyde is 10
• The shift of a carboxylic acid is 12
• In C13 NMR, methyl appears at 0-50
• In C13 NMR, C-N, C-O, and C-C triple bonds appear at 50-100
• In C13 NMR, aromatic C and C-C double bonds appear at 100-150
• In C13 NMR, C-O double bonds appear at 150-220
• Full decoupled C13 spectrum shows all carbon peaks
• DEPT-90 only shows CH signals
• DEPT-135 shows positive CH3 and CH signals, negative CH2 signals, and no C signal