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Butadiene, also known as 1,3 butadiene (CH 2=CHCH=CH2), is a gaseous, flammable hydrocarbon made by dehydrogenation of butane and butene or by cracking naptha. Butadiene, an alkene, is mostly copolymerized with styrene to make synthetic rubber. Relative density 0.62, melting point -108.9°C (-164.0°F), boiling point -4.4°C (24.1°F). See also Diels-Alder reaction.

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