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Preparation of Cyclohexene

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Introduction

Preparation of Cyclohexene Aim The main aim of this experiment is to synthesise Cyclohexene from Cyclohexanol using the 'Quick Fit' apparatus, and then purifying and distilling the product. I will then try a number of reactions with the Cyclohexene to test its purity and content. Method 1. Add 10cm3 of Cyclohexanol in a round bottomed flask 2. With a dropping pipette, add 4cm3 of concentrated Phosphoric Acid - shake the flask as you add the acid (noting increased temperature) NB. CAUTION: Handle phosphoric acid with care. It is corrosive to tissue. If your skin comes into contact with Phosphoric acid, wash the contaminated area immediately with water, then soap and water. Clean up spills immediately using the sodium bicarbonate if available. ...read more.

Middle

I will then shake the mixture until it becomes clear (adding more Anhydrous Calcium Chloride if necessary) 9. I then should distil the liquid collecting the liquid at 80oC and stop collecting at 82oC. I will then record the volume of purified Cyclohexene. NB. The final (second) distillation must be done carefully, using clean dry apparatus to obtain pure product. For best results rinse the apparatus with a little ethanol and a little acetone to speed up the drying process. Air can also be gently blown through the glassware to speed up the drying. It is important to remove all water and organic solvents before the final distillation or the product will become contaminated. Results Cyclohexene Product 1. Burns with a sooty yellow flame, leaves no residue 2. Decolourises Bromine water (Orange >>>Colourless) ...read more.

Conclusion

The bromine solution is reddish-orange. Bromine reacts with an alkene to form a colourless dibromide. Thus, if a bromine solution is added to an alkene, the solution will decolourise until all of the alkene has reacted. Alkanes on the other hand do not react with bromine in this way, so the very first drop of bromine solution will cause a reddish-orange colour to persist. Potassium permanganate is purple. It reacts with alkenes to produce a colourless diol and a finely divided brown precipitate of manganese dioxide. Under acidic conditions the diol can further react to form a colourless dicarboxylic acid. Thus, when permanganate is added to an alkene, the purple colour disappears and a brownish suspension forms until all of the alkene has reacted. Permanganate does not react with alkanes, so the first drop of permanganate added to an alkane immediately results in a purple solution. - 1 - ...read more.

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