Limonene Handout - tube and use miscroscale technique to...

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Experiment 7: Limonene Steam Distillation and Optical Rotation
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Limonene Found in citrus fruits (most abundant in oranges). Limonene bp 176 o C d = 0.840 g/mL How can we separate limonene from other components?
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Distillation Question Fractional distillation of 20 mL of methanol- water mixture resulted in the following distillation curve. The percentage of the low boiling component in the mixture is: A. 15% B. 25% C. 30% D. 33% E. 45%
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Steam Distillation Steam Distillation (Co-distillation with _____): allows distillation of relatively ________________compounds without decreasing pressure (vacuum) Relies on mutual _________ of water and organic compound
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Vapor Pressures Comparison
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Steam Distillation Setup
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Extraction Take organic layer and ~10 mL of aqueous layer from distillate. Add NaCl and separate using sep funnel, leaving small amount of aq layer in sep funnel. Transfer contents of funnel to centrifuge
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Unformatted text preview: tube and use miscroscale technique to separate. Optical Activity Limonene exists as two enantiomers. Your sample should be ____________! H (R)-(+)-Limonene bp 176 o C density 0.840 g/mL [ ! ] D +125.6 o H (S)-(-)-Limonene bp 176 o C density 0.840 g/mL [ ! ] D-122.1 o Rotation of Plane-polarized Light Polarimeter 4 samples: Ethanol blank (+)-Limonene (-)-Limonene Class sample Specific Rotation & Enantiomeric Excess You will need to calculate specific rotation from observed rotation. Use _______ of limonene for concentration. Measure length in dm. [ ] t = obs c l Experiment Notes This is experiment is long! Be prepared! Read optical activity of blank (ethanol) and limonene standards while steam distillation is in progress! Dont forget oranges!...
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This note was uploaded on 11/23/2010 for the course CHEMISTRY Chem 51 LA taught by Professor Dr.reneelink during the Spring '10 term at UC Irvine.

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Limonene Handout - tube and use miscroscale technique to...

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