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Cyclopentadiene is a highly reactive diene in the Diels–Alder reaction because minimal distortion of the diene is required to achieve the envelope geometry of the transition state compared to other dienes. [11] Famously, cyclopentadiene dimerizes. The conversion occurs in hours at room temperature, but the monomer can be stored for days at ...
For the preparation of some particularly robust complexes, e.g. nickelocene, cyclopentadiene is employed in the presence of a conventional base such as KOH. When only a single Cp ligand is installed, the other ligands typically carbonyl, halogen, alkyl, and hydride.
It is formed by the deprotonation of cyclopentadiene. The cyclopentadienyl anion is a ligand which binds to a metal in organometallic chemistry. [2] The first salt with this anion, potassium cyclopentadienide, was prepared by Johannes Thiele in 1901 [3] but there wasn't much interest in the topic until the discovery of ferrocene in the 1950s.
The (tert-butyl)cyclopentadiene is prepared by alkylation of cyclopentadiene with tert-butyl bromide in the presence of sodium hydride and dibenzo-18-crown-6. [1] The intermediate in this synthesis is di-tert-butylcyclopentadiene. This compound is conveniently prepared by alkylation of cyclobutadiene with tert-butyl bromide under phase-transfer ...
Trimethylsilyl cyclopentadiene is an organosilicon compound with the chemical formula C 5 H 5 Si(CH 3) 3. It exists as a colorless liquid. It exists as a colorless liquid. It is used in the synthesis of some metal cyclopentadienyl complexes and has attracted interest for its fluxional structure .
1,2,3,4,5-Pentakis(4-butylphenyl)-1,3-cyclopentadiene is an organochemical compound from the diene group and a cyclopentadiene derivative. The anion of this compound is used as a sterically demanding ligand, often abbreviated as Cp [BIG] , in the organometallic chemistry of sandwich compounds .
Pentacyanocyclopentadiene is a derivative of cyclopentadiene with five cyano groups with the molecular formula C 5 H(CN) 5. The corresponding anion, pentacyanocyclopentadienide, is a ligand with the molecular formula C 5 (CN) − 5. In contrast to other anions based on a C 5 ring unit it binds to metals through the pendant cyano groups rather ...
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