Isolation of Eugenol

Topics: Distillation, Essential oil, Infrared Pages: 2 (559 words) Published: October 22, 2006
Introduction
In this experiment, the essential oil eugenol (the main component of oil of cloves) will be isolated from whole cloves using the technique of simple distillation, which is often used to isolate liquid natural products from plants. The mixture of whole cloves and distilled water will then be heated to boiling and the distillate (a eugenol/water mixture) will be collected. The eugenol will then be separated from the water by extraction with pentane. The pentane solutions will then be dried over magnesium sulfate, remove the magnesium sulfate by vacuum filtration and remove the pentane from the filtrate by evaporation on a water bath in the hood. The percent recovery from cloves will be determined and the product will be analyzed by transmission infrared spectroscopy (IR). Oil of cloves, which consists almost entirely of eugenol and its acetate, is used in perfumeries, flavorings, essential oils and in medicine (local antiseptic and analgesic).

Reaction: See flow chart attached

Data and observation
SubstanceAmount isolated (g.)Percent recovery (%)Observations Eugenol0.7127.12 Large droplet of yellow oil with an aromatic spicy odor. Acetyleugenol0.5285.28Clear to pale yellow oily liquid with aromatic spicy odor.

Calculations
Percent recovery of eugenol
Amt. Eugenol isolated0.712 g
% Recovery = ------------------------------ = -------------- x 100 = 7.12 % Amt. Cloves used10 g

IR spectrograph: See IR graph attached

Conclusion
Simple distillation of whole cloves produced 0.712 g of a yellow oil with spicy aromatic odor, which contained in its IR spectrum the functional groups O-H (at 3453 cm-1), sp2 C-H (3009 cm-1), C=C-H (2980 cm-1), and alkene C=C (at 1600 cm-1) and aromatic C=C (at 1520 cm-1). These data are consistent with the structure of eugenol. In addition, the IR of the product from the simple distillation of cloves closely corresponds with that of an...
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