Cupren
Cuprene is a brown cork-like mass produced by polymerization from acetylene in the presence of copper with the approximate formula (C 7 H 6 ) n , which was formerly used as an explosive base and insulating material. It is formed from acetylene in the presence of copper kieselguhr in paraffin oil or methylnaphthalene at 100-230 ° C, while passing acetylene over copper and a small amount of magnesium at 250-300 ° C or upon reaction of acetylene with copper compounds such as copper oxides in 230-330 ° C. Cuprene is also formed when acetylene is exposed to light and α or β radiation . The name of the substance is derived from copper ( Latin cuprum ).
Cuprene consists of a mixture of hydrocarbons including benzoic acid , mellitic acid and naphthalenes . As a by-product of the pyrogenic acetylene condensation, besides cuprene with the so-called cup tar, a tar-like liquid with a complicated chemical composition is formed.
Individual evidence
- ↑ Johann Heinrich Vogel : The acetylene, its properties, its production and use . Springer-Verlag, 1923, ISBN 978-3-662-34124-7 , p. 43 ( limited preview in Google Book search).
- ↑ a b c Eugen Baroni : Catalysis in organic chemistry first half . Springer-Verlag, 1943, ISBN 978-3-7091-5939-2 , Polymerization and Depolymerization. Practical part, p. 406 ( limited preview in Google Book search).
- ↑ Entry on Cupren. In: Römpp Online . Georg Thieme Verlag, accessed on September 7, 2015.
- ^ P. Schläpfer, O. Stadler: Investigations on the Cupren tar. Contribution to the knowledge of pyrogenic acetylene condensations. In: Helvetica Chimica Acta. 9, 1926, p. 185, doi: 10.1002 / hlca.19260090121 .