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Limonene presentation

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by

Lemeeka Rana

on 21 February 2013

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Transcript of Limonene presentation

By- Lemeeka Rana Limonene Extra info What is Limonene? Limonene takes its name from the lemon, as the rind of the lemon, like other citrus fruits, contains considerable amounts of this compound, which contributes to their odour. Chemical reactions Limonene is a relatively stable terpene and can be distilled without decomposition, although at elevated temperatures it cracks to form isoprene.It oxidizes easily in moist air to produce carveol, carvone, and limonene oxide.With sulfur, it undergoes dehydrogenation to p-cymene. Infrared spectrum of Limonene From the spectrum above for limonene the only absorptions at 2850-3100 wave number indicates there are C-H bonds only. Mass spectrum of limonene H NMR of limonene From the H NMR we can tell:
the ppm between 1 and 2 shows all carbon adjacent has C-H bonds
the ppm around 4.8 indicates the adjacent carbon has C=C with no hydrogen since it is a singlet
The protons present in the compound has 7 different environments
The C NMR spectrum for limonene From the carbon spectrum above we can tell that:
The ppm between 0-50 shows there are C-C bond
The ppm at 120-160 shows there is the cyclic benzene ring image of limonene source:http://en.wikipedia.org/wiki/File:Limonene-2D-skeletal.svg Limonene is a colourless liquid hydrocarbon classified as a cyclic terpene. The more common D isomer possesses a strong smell of oranges.It is used in chemical synthesis as a precursor to carvone and as a renewably based solvent in cleaning products. From the mass spectrum above we can see that the m/z value of overall compound is around 136.
Final structure of limonene after the analysis Evidences
From the infrared spectrum , there are only C-H bonds
From the mass spectrum the final m/z value adds up to 136 since the molecular formula is C10H16
From the H NMR spectrum, the fact that C=C involved
From the C NMR the benzene ring present in limonene Thank you for watching Sources:http://en.wikipedia.org/wiki/Limonene
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