Doc Brown's Chemistry

CHARACTERISTIC NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY - NMR PROTON (H) CHEMICAL SHIFTS

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NMR molecular structure problems

KS4 Science GCSE/IGCSE Revision Qualitative Analysis Quiz on chemical test methods for identifying ions, gases and compounds

Qualitative Analysis * Quantitative analysis: acid-base, silver nitrate-chloride, EDTA titrations * Quantitative analysis: Redox titrations

Type of Proton (R = alkyl) Structure Chemical Shift, ppm
cyclopropane C3H6 0.2
alkane - primary H, R = alkyl R-CH3 0.8 - 1.2
alkane - secondary H, R = alkyl R2-CH2 1.3 - 1.4
alkane - tertiary H, R = alkyl R3-C-H ~1.5
alkene - H directly attached to C of double bond C=C-H 4.5 - 6.0
alkyne Ctriple bondC-H 2 - 3
aromatic (arene) Ar-H 6 - 9
aromatic - aliphatic on ring e.g. C6H5CH3 Ar-C-H 2.2 - 3
alkene - methyl group on the next carbon beyond C=C C=C-CH3 1.6 - 1.7
alkene - next carbon beyond C=C in longer chain C=C-CH2-R ~2.3
fluorides H-C-F 4 - 4.5
chlorides H-C-Cl 3 - 4
bromides H-C-Br 2.5 - 4
iodides H-C-I 2 - 4
alcohols H-C-OH 3.4 - 4
ethers H-C-OR 3.3 - 4
esters - H on 1st C of ...oate RCOO-C-H 3.7 - 4.1
esters - H on 1st C of ...ic H-C-COOR 2 - 2.2
methanoic acid H-C-COOH 2 - 2.6
carbonyl Compounds - C next to C=O in ketones H-C-C=O 2.0 - 2.7
aldehyde R-(H-)C=O 9 - 10
hydroxy group in alcohols R-C-OH 3.3 - 3.6
phenols (hydroxy-arenes) Ar-OH 4 - 12
enolic C=C-OH 15 - 17
carboxylic RCOOH 9 - 15
amino RNH2 1 - 6
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