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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 .
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]
cis-1,3-pentadiene. trans-1,3-pentadiene, also known as piperylene. 1,4-pentadiene, H 2 C=CH−CH 2 −CH=CH 2. [4] 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 ...
Structure of (t Bu 3 C 5 H 2) 2 Fe 2 N 2. 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 ...
Piperylene or 1,3-pentadiene is an organic compound with the formula CH 3 −CH=CH−CH=CH 2. It is a volatile , flammable hydrocarbon . It is one of the five positional isomers of pentadiene .
Methylcyclopentadiene is any of three isomeric cyclic dialkenes with the formula C 5 MeH 5 (Me = CH 3).These isomers are the organic precursor to the methylcyclopentadienyl ligand (C 5 H 4 Me, often denoted as Cp′), commonly found in organometallic chemistry.
It is prepared by treating cyclopentadiene with butyllithium: [1] C 5 H 6 + LiC 4 H 9 → LiC 5 H 5 + C 4 H 10. Because lithium cyclopentadienide is usually handled as a solution, the solvent-free solid is rarely encountered.
The C 5 O core of the molecule is planar and conjugated, but the bonds have a definite alternating single- and double-bond nature. The C2–C3 and C4–C5 distances are 1.35 Å, while the C1–C2, C3–C4, C5–C1 are closer to single bonds with distances near 1.50 Å. [1]