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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 .
Cyclopentadiene is an organic compound with the formula C 5 H 6. [6] It is often abbreviated CpH because the cyclopentadienyl anion is abbreviated Cp −.. This colorless liquid has a strong and unpleasant odor.
Di-tert-butylcyclopentadiene is an organic compound with the formula (Me 3 C) 2 C 5 H 4, 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, (Me 3 C) 2 C 5 H 3 − [1] (sometimes abbreviated Cp ‡−).
2,3-pentadiene, H 3 C−CH=C=CH−CH 3, with two enantiomers (R and S). [5] It and 1,2-pentadiene are the least common isomers of pentadiene. Well known derivatives containing pentadiene groups include hexadienes , cyclopentadiene , and especially three fatty acids linoleic acid , α- linolenic acid , and arachidonic acid as well as their ...
[2] [1] Illustrative of the unusual complexes made possible with these bulky ligands is molecular iron nitrido complex ( t Bu 3 C 5 H 2 ) 2 Fe 2 N 2 . [ 3 ] In contrast to (C 5 Me 5 ) 2 Ir 2 Cl 4 , ( t Bu 3 C 5 H 2 )IrCl 2 is monomeric.
1,3-Cyclopentanedione is an organic compound with the formula (CH 2) 3 (CO) 2. It is one of two isomeric cyclopentanediones, the other being 1,2-cyclopentanedione. The enol is predicted to be about 1-3 kcal/mol more stable than the diketo form. [1] The enol structure has been confirmed by X-ray crystallography. [2]
The central ring can serve as a diene in Diels–Alder reactions with various dienophiles. For example, reaction with benzyne leads to 1,2,3,4-tetraphenylnaphthalene and reaction with diphenylacetylene leads to hexaphenylbenzene. [5] In this way, it is a precursor to graphene-like molecules, [6] such as coronene.
The parent cyclopentadienone is rarely encountered, because it rapidly dimerizes. [1] Many substituted derivatives are known, notably tetraphenylcyclopentadienone. Such compounds are used as ligands in organometallic chemistry. [2] The Knölker complex, derived from a substituted cyclopentadienone, is a catalyst for transfer hydrogenation. [3]