PREPARING CYCLOHEXENE FROM CYCLOHEXANOL


INTRODUCTION
Alkenes can be prepared in the lab by dehydrating the corresponding alcohol. Concentrated sulphuric and phosphoric acids both act as dehydrating agents. Phosphoric acid is preferred because it gives a higher yield of the alkene. Concentrated H2SO4 reacts with alkenes.

SAFETY
Eye protection must be worn. Concentrated phosphoric acid is corrosive. Mop up spillages immediately with plenty of water.
Cyclohexene and cyclohexanol are highly flammable. Keep away from naked flames. Anhydrous calcium chloride is an irritant.

PREPARATION
1) Weigh out between 9 and 10 grams of cyclohexanol directly into a 250cm3 round-bottomed, quickfit flask. Record accurately the mass of alcohol used.
2) Measure out 4cm3 of concentrated phosphoric acid in a small, glass measuring cylinder. Add this SLOWLY to the cyclohexanol in the flask and mix thoroughly by swirling cautiously.
3) Add an anti-bumping granule to the flask and set......

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Title: Preparation Of Cyclohexene
Approximate Word Count: 755
Approximate Pages: 4 (250 words per double-spaced page)

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