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chloroprene

chloroprene Chem.
  (ˈklɔərəpriːn, ˈklɒr-)
  [f. chloro-2 + isoprene.]
  A colourless liquid, made from acetylene and hydrochloric acid, which polymerizes to form neoprene.

1931 W. H. Carothers et al. in Jrnl. Amer. Chem. Soc. LIII. 4203 In order to recognize the analogy in structure and behavior which exists between isoprene and chloro-2-butadiene-1,3, we call the latter compound chloroprene. 1958 Times Rev. Industry Nov. 64/2 Acetylene is now..used in the production of chloroprene.

Oxford English Dictionary

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