cyclopentadienyl anion造句

• Cyclopentadienyl is formally related to cyclopentadienyl anion by one-electron oxidation.
• The original synthesis used a cyclopentadienyl anion and half-sandwich precursors.
• In the structure shown at right, the two pentagons are the cyclopentadienyl anions with circles inside them indicating they are aromatically stabilized.
• Electron counting of this ferrous complex indicates 6 electrons from the cyclopentadienyl anion, 2 electron from each of the carbonyls, and 2 electrons from the iodide.
• The cyclopentadienyl anion ( ) with six pi electrons is considerably more stable than either the neutral cyclopentadienyl radical with five pi electrons or the corresponding cation with four.
• Salts of the cyclopentadienyl anion can be stable, e . g ., sodium cyclopentadienide . more complex coordination compounds are known as cyclopentadienyl complexes, such as metallocene
• For example, the cyclopentadienyl anion and the cycloheptatrienylium cation are both considered to be aromatic ions, and the azulene molecule can be approximated as a combination of both.
• The Ni center has a formal + 2 charge, and the Cp rings are usually assigned as cyclopentadienyl anions ( Cp  " ), related to cyclopentadiene by deprotonation.
• V ( CO ) 6 reacts with sources of the cyclopentadienyl anion to give the orange four-legged piano stool complex ( C 5 H 5 ) V ( CO ) 4 ( m . p . 136 癈 ).
• On the other hand, stable fulvalenes can be obtained by proper mesomeric form with for instance pentaheptafulvalene "'4 "', which can be thought of as a tropylium cation joined to a cyclopentadienyl anion ( both stable and aromatic ).
• One tool for the detection of carbanions in solution is proton NMR . A spectrum of cyclopentadiene in DMSO shows four vinylic protons at 6.5 ppm and two methylene bridge protons at 3 ppm whereas the cyclopentadienyl anion has a single resonance at 5.50 ppm.