Interpret the results of the UV-vis spectra and briefly explain why the 3-phenylpropionaldehyde compound did not peak but the others did (hint: conjugated system).

Q: Br R = H, CH3 B(OH)2 R' Pd(OAc)2, PPh3 aq Na₂CO3 n-PrOH R' = H, CH3, OCH 3

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Q: 2873 32 1739.51 1465.18 1387.71 1366.42 1171.25 1054 72 961.35

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Q: 8 . 20 3.410 1.746 0.931

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NMR Spectroscopy

NMR stands for Nuclear Magnetic Resonance in which the study of different molecules is done based on the interaction of radiofrequency electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. A precise study of spectra of visible light and all bands of electromagnetic radiation is called spectroscopy.