
Piperylene is a volatile, flammable hydrocarbon consisting of a five carbon chain with two double bonds. It is obtained as a byproduct of ethylene production from crude oil. Piperylene is used as a monomer in the manufacture of plastics, adhesives and resins. Piperylene is colorless. ...
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http://en.wikipedia.org/wiki/Piperylene

• (n.) A hydrocarbon obtained by decomposition of certain piperidine derivatives.
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http://thinkexist.com/dictionary/meaning/piperylene/
Pi·per'y·lene noun [
Piper idine + acet
ylene .]
(Chemistry) A hydrocarbon obtained by decomposition of certain piperidine derivatives.
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http://www.encyclo.co.uk/webster/P/93
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