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Unformatted text preview: 13C-NMR signals appear in the considerably wider range of δ 10-60 • Alkenes – 1H-NMR signals appear in the range δ 4.6-5.7 – 1H-NMR coupling constants are generally larger for trans vinylic hydrogens (J= 11-18 Hz) compared with cis vinylic hydrogens (J= 5-10 Hz) – 13C-NMR signals for sp2 hybridized carbons appear in the range δ 100-160, which is downfield from the signals of sp3 hybridized carbons • Alcohols 1H-NMR O-H chemical shifts often appears in the range δ 3.0-4.0, but may be as low as δ 0.5. – 1H-NMR chemical shifts of hydrogens on the carbon bearing the -OH group are deshielded by the electron-withdrawing inductive effect of the oxygen and appear in the range δ 3.0-4.0 • Ethers – a distinctive feature in the 1H-MNR spectra of ethers is the chemical shift, δ 3.3-4.0, of hydrogens on carbon attached to the ether oxygen • Aldehydes and ketones – 1H-NMR: aldehyde hydrogens appear at δ 9.5-10.1 – 1H-NMR: α-hydrogens of aldehydes and ketones appear at δ 2.2-2.6 – 13C-NMR: carbonyl carbons appear at δ 180-215 • Amines – 1H-NMR: amine hydrogens appear at δ 0.55.0 depending on conditions • Carboxylic acids – 1H-NMR: carboxyl hydrogens appear at δ 10-13, – 13C-NMR: carboxy...
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This note was uploaded on 03/23/2010 for the course CH 310n taught by Professor Iverson during the Spring '08 term at University of Texas at Austin.

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