Tripropylene

Tripropylene, also known as propylene trimer, is usually sold as a mixture of structural isomers of nonene. This mixture is obtained by oligomerization of propene:

C3H6 → C9H18
Tripropylene
Identifiers
3D model (JSmol)
ChemSpider
  • 4,6-Dimethyl-1-heptene:: InChI=1S/C9H18/c1-5-6-9(4)7-8(2)3/h5,8-9H,1,6-7H2,2-4H3
    Key: FSWNZCWHTXTQBY-UHFFFAOYSA-N
  • 4,6-Dimethyl-1-heptene:: CC(C)CC(C)CC=C
Properties
C9H18
Molar mass 126.24
Appearance colourless liquid
Density 1.022
Melting point -93.5
Boiling point 156
very low
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

In this process, two double bonds are lost and one is retained as illustrated by the isomer shown in the figure. The reaction is catalyzed by acids, such as polyphosphoric acid. A variety of catalysts have been explored. The reaction proceeds via the formation of a carbocation ((CH3)2CH+), which attacks another propylene unit, generating a new carbocation, etc. This kind of process affords mixtures (C3H6)n.

Like other alkenes, propylene trimer is used as an alkylating agent. A number of surfactants and lubricants are produced by alkylation of aromatic substrates.

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