In this video, we solve an organic structure determination problem using the molecular formula C₉H₁₀O₂ together with IR, ¹H NMR, and ¹³C NMR spectral data.
We analyze the spectra step by step to identify key structural features, including:
Calculating the degree of unsaturation (DBE)
Identifying a carbonyl group from IR and ¹³C NMR
Interpreting ¹H NMR chemical shifts, integrations, and splitting patterns
Recognizing the characteristic pattern of a para-disubstituted benzene ring
Identifying methyl and methoxy groups
Using molecular symmetry to interpret the number of ¹³C NMR signals
Combining all the evidence to determine the final molecular structure
The analysis leads to 4-methoxyacetophenone (p-methoxyacetophenone) and demonstrates how multiple spectroscopic techniques work together to solve an unknown structure.
#OrganicChemistry #NMR #Spectroscopy #HNMR #CNMR #IRSpectroscopy #StructureDetermination #OrganicChemistry2