Exhibit 13-9
To answer the following question(s),consider the data and 1 H NMR spectrum below:
The mass spectrum of this compound shows a molecular ion at m/z = 113,the IR spectrum has characteristic absorptions at 2270 and 1735 cm− 1 ,and the 13 C NMR spectrum has five signals. Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/
-Refer to Exhibit 13-9.Describe the signal at 3.5 δ in terms of its integration,splitting pattern and chemical shift.

Question

Exhibit 13-9
To answer the following question(s),consider the data and 1 H NMR spectrum below:
The mass spectrum of this compound shows a molecular ion at m/z = 113,the IR spectrum has characteristic absorptions at 2270 and 1735 cm− 1 ,and the 13 C NMR spectrum has five signals.  Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/
-Refer to Exhibit 13-9.Describe the signal at 3.5 δ in terms of its integration,splitting pattern and chemical shift.

Quizplus · Accepted Answer

The Answer is The integration of the signal at 3.5 δ indicates that it is due to two equivalent hydrogens,probably a −CH₂− group.Since the signal is a singlet (not split) there are no nonequivalent hydrogens attached to the atoms adjacent to the carbon to which these two hydrogens are bonded.The chemical shift to 3.5 δ indicates that this −CH₂− group has at least one electronegative atom or group bonded to it,possibly a carbonyl group.

Exhibit 13-9 To Answer the Following Question(s),consider the Data and 1H NMR

Exhibit 13-9 To Answer the Following Question(s),consider the Data and ¹H NMR