Styrene (C₆H₅CH=CH₂)

         It is present in storax balsam and coal-tar in traces.

         (1) Preparation

         (i) Dehydrogenation of side chain of ethylbenzene :

         (ii) Decarboxylation of cinnamic acid : That is the laboratory preparation and involves heating of cinnamic acid with a small amount of quinol.

         (iii) Dehydration of 1-phenyl ethanol with H₂SO₄ : 

         (iv) Dehydration of 2-phenyl ethanol with respect to ZnCl₂:

          (v) Dehydrohalogenation of 1-phenyl-1-chloro ethane: On heating with alcoholic potassium hydroxide, a molecule of hydrogen chloride is eliminated by the chloroderivative.

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