Di-tert-butylcyclopentadiene

Chemical compound From Wikipedia, the free encyclopedia

Di-tert-butylcyclopentadiene is an organic compound with the formula (Me3C)2C5H4, where Me = methyl. It is a colorless liquid that is soluble in organic solvents. The compound is the conjugate acid of the di-tert-butylcyclopentadienyl ligand, (Me3C)2C5H3−[1] (sometimes abbreviated Cp‡−). Two regioisomers of di-tert-butylcyclopentadiene exist, depending on the relative location of the double bonds.

Quick facts Identifiers, Properties ...
Di-tert-butylcyclopentadiene
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/C13H22/c1-12(2,3)10-7-8-11(9-10)13(4,5)6/h7-10H,1-6H3
    Key: RADVPPBTEASJRZ-UHFFFAOYSA-N
  • CC(C)(C)C1C=CC(=C1)C(C)(C)C
Properties
C13H22
Molar mass 178.319 g·mol−1
Boiling point 100–105 °C (212–221 °F; 373–378 K) 30 torr
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis and reactions

Di-tert-butylcyclopentadiene is prepared by alkylation of cyclopentadiene with tert-butyl bromide under phase-transfer conditions.[2]

It is the precursor to many metal complexes, such as the olefin polymerization catalyst ((Me3C)2C5H3)TiCl3.[3]

The conjugate base of di-tert-butylcyclopentadiene reacts with a third equivalent of tert-butyl bromide to give (Me3C)3C5H3:

(Me3C)2C5H4 + NaH → Na(Me3C)3C5H3 + H2
Na(Me3C)2C5H3 + Me3CBr → (Me3C)3C5H3 + NaBr

References

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