Question 18.39: Deduce the structure of isomeric ketones having the molecula......
Deduce the structure of isomeric ketones having the molecular formula C₁₀H₁₂O based on the following proton NMR spectra.
The 5H multiplet corresponds to the monosubstituted benzene ring; the 2H singlet corresponds to a methylene group with no hydrogens on neighboring carbon atomss; the 2H quartet and 3H triplet are the classical signature of an ethyl group.
The doublet of doublets corresponds to the para-substituted benzene ring; the 3H singlet corresponds to a methylene group with no hydrogens on bonded carbons; the 2H quartet and 3H triplet are the classical signature of an ethyl group.
The 5H multiplet corresponds to the mono-substituted benzene ring; the 3H singlet corresponds to a methyl group with no hydrogens on bonded carbons; the 2H triplets correspond to the two methylene groups. The methylene group at 2.8 d corresponds to the methylene group bonded to the carbonyl carbon.
