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It is a colorless nonvolatile oil. It can be produced by the palladium-catalyzed hydrocarboxylation of cyclopentene: [2] C 5 H 8 + CO + H 2 O → C 5 H 9 CO 2 H. An alternative route involves base-induced ring contraction of 2-chlorocyclohexanone to give the ester methyl cyclopentanecarboxylate, which can be hydrolyzed to the carboxylic acid. [3]
In 1895, Nikolai Kischner discovered that methylcyclopentane was the reaction product of hydrogenation of benzene using hydriodic acid. Prior to that, several chemists (such as Marcellin Berthelot in 1867, [ 9 ] [ 10 ] and Adolf von Baeyer in 1870 [ 11 ] ) had tried and failed to synthesize cyclohexane using this method.
Examples include 2-pentyl- and 2-heptylcyclopentanone. [4] It is a versatile synthetic intermediate, being a precursor to cyclopentobarbital. [5] Cyclopentobarbital, a drug made from cyclopentanone. Cyclopentanone is also used to make cyclopentamine, the pesticide pencycuron, and pentethylcyclanone. [5]
One of the routes involves elimination of α-bromo-cyclopentanone using lithium carbonate [2] and Claisen condensation-decarboxylation-isomerization cascades of unsaturated diesters as shown below. [3] Industrial synthesis of cyclopentenone. The acid-catalyzed dehydration of cyclopentanediols affords cyclopentenone. [4]
2-Methyl-4-pentenoic acid, 2-methyl-pent-4-enoic acid. The hexyl ester (CAS 58031-03-1, FDA MGQ3MUU64F, FEMA 3693, PUBchem 53426766, US patents 3966799,3976801) is a ...
Cyclopentene is a chemical compound with the formula (CH 2) 3 (CH) 2. It is a colorless liquid with a petrol-like odor. It has few applications, and thus is mainly used as a minor component of gasoline, present in concentrations of less than 1%. [1] [2] It is one of the principal cycloalkenes.
2-Methylpentane, trivially known as isohexane, is a branched-chain alkane with the molecular formula C 6 H 14.It is a structural isomer of hexane composed of a methyl group bonded to the second carbon atom in a pentane chain.
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.