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Residual solvents are typically organic volatile chemicals that are not completely removed from the sample. Many residual solvents exhibit a characteristic pattern when examined via NMR. The goal of this puzzle is to identify a residual solvent by NMR.
The aliphatic region of the 1H NMR spectrum below is for an unknown acquired in CDCl3. Are any residual solvents evident?
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Perhaps, it is ethanol. 3.5 ppm quartet of the methylene protons and 1-0.9 ppm triplet of the methyl protons. The ratio of integral intensities for these signals (2:3) agrees with this guess.
Posted by: Bogdan | August 10, 2011 at 06:18 PM
diethyl ether?
Posted by: Carlos | August 11, 2011 at 06:36 AM
Looks like Ethanol
Regards,
RMurugan
Posted by: R Murugan | August 11, 2011 at 09:47 AM
signals at 1.21(t), 3.48(q) attrib to diethyl ether and also ethyl methyl ketone
Posted by: Djalma Oliveira | August 11, 2011 at 11:50 AM