August 10, 2011
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?
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.
diethyl ether?
Looks like Ethanol
Regards,
RMurugan
signals at 1.21(t), 3.48(q) attrib to diethyl ether and also ethyl methyl ketone
Taniyah Dinsmore
Thanks again for the blog.Much thanks again. Great.