Explain the importance of IR spectra in the structure determination of terpenes.?
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Answer:
IR spetrum of terpene should be quite simple. The finger print region shouldn't have any significant or strong peaks. That region is specific for C=O or C-O. The spectrum should consist only peaks jst slightly higher than 3000cm-1 which are C=C-H stretch. Peaks slightly lower than 3000cm-1 which are C-C-H stretch. There should be some weak peaks around 1680-1580cm-1 which are responsible for C=C stretch.
So the importance of IR spectra is it shows the salient peaks that are due from the main 3 stretches of terpenes molecule
Subtle differences in positional and configurational isomers commonly found with terpenes could be easily detected by the MI/FT-IR spectra. The results are comparable in some aspects to those obtainable from 13C-NMR and thin-film IR; however, most importantly, they are acquired at the low nanogram level for MI/FT-IR, as compared to the milligram level for the other techniques. These results represent an advance in the technology available for the analysis of complex mixtures such as essential oils containing terpene-like molecules.
IR will give you the functional groups present in the terpene. However other useful methods are HNMR, CNMR, mass spectrometry and UV. Combined, these techniques can assist in structure determinationof terpenes, alkaloids and other natural products.
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Answer:
IR spetrum of terpene should be quite simple. The finger print region shouldn't have any significant or strong peaks. That region is specific for C=O or C-O. The spectrum should consist only peaks jst slightly higher than 3000cm-1 which are C=C-H stretch. Peaks slightly lower than 3000cm-1 which are C-C-H stretch. There should be some weak peaks around 1680-1580cm-1 which are responsible for C=C stretch.
So the importance of IR spectra is it shows the salient peaks that are due from the main 3 stretches of terpenes molecule
Subtle differences in positional and configurational isomers commonly found with terpenes could be easily detected by the MI/FT-IR spectra. The results are comparable in some aspects to those obtainable from 13C-NMR and thin-film IR; however, most importantly, they are acquired at the low nanogram level for MI/FT-IR, as compared to the milligram level for the other techniques. These results represent an advance in the technology available for the analysis of complex mixtures such as essential oils containing terpene-like molecules.
IR will give you the functional groups present in the terpene. However other useful methods are HNMR, CNMR, mass spectrometry and UV. Combined, these techniques can assist in structure determinationof terpenes, alkaloids and other natural products.
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