{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

8 17 13c nmr signals appear in the considerably wider

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}