134044-81-8

Basic information

• Product Name: 2,5-dichloro-4-hydroxyphenoxyl radical
• Synonyms: 2,5-dichloro-4-hydroxyphenoxyl radical
• CAS NO: 134044-81-8
• Molecular Weight: 177.995
• Mol File: 134044-81-8.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: 2,5-dichloro-4-hydroxyphenoxyl radical(CAS DataBase Reference)
• NIST Chemistry Reference: 2,5-dichloro-4-hydroxyphenoxyl radical(134044-81-8)
• EPA Substance Registry System: 2,5-dichloro-4-hydroxyphenoxyl radical(134044-81-8)

Safety Data

• Hazardous Substances Data: 134044-81-8(Hazardous Substances Data)

Upstream product

• 824-69-1 2,5-dichloro-1,4-hydroquinone 
• 34865-89-9 p-hydroxydiphenylamine radical 
• 2406-04-4 4-(phenylimino)cyclohexa-2,5-dienone 
• 615-93-0 2,5-Dichloro-1,4-benzoquinone 
• 2143-67-1 diphenylaminyl radical 

Downstream Products

• 615-93-0 2,5-Dichloro-1,4-benzoquinone 
• 824-69-1 2,5-dichloro-1,4-hydroquinone 
• 34865-89-9 p-hydroxydiphenylamine radical 
• 2406-04-4 4-(phenylimino)cyclohexa-2,5-dienone 
• 122-37-2 4-anilinophenol 

Relevant articles and documents

Rate constants of elementary steps of the reversible chain reaction of N-phenyl-1,4-benzoquinonemonoimine with 2,5-dichlorohydroquinone

The kinetics of reversible chain reactions in quinoneimine-hydroquinone systems has first been studied for the reaction of N-phenyl-1,4- benzoquinonemonoimine with 2,5-dichloro-hydroquinone used as an example. The dependences of the reaction rate on the concentration of the initial reactants, initiator, and each product were studied. The reliable estimates of the rate constants of 11 (of 12) elementary steps of this reaction were obtained from the experimental data using the earlier derived formulas and the method of equal concentrations developed in the present work.

Photoreduction of p-Benzoquinones: Effects of Alcohols and Amines on the Intermediates and Reactivities in Solution

The photochemistry of 1,4-benzoquinone (BQ) and alkyl-, Cl- and related derivatives, e.g. methyl-, 2,6-dimethyl-, chloro-, 2,5-dichloro-1,4-benzoquinone, duroquinone and chloranil, was studied in nonaqueous solvents by UV-vis spectroscopy using nanosecond laser pulses at 308 nm. The reactivity of the triplet state (3Q*) of the quinones with 2-propanol in the absence of water is largest for BQ and depends mainly on the quinone structure, whereas the rate constant of electron transfer from amines, such as triethylamine (TEA) or 1,4-diazabicyclo[2.2.2]octane, is close to the diffusion-controlled limit for BQ and most derivatives. Photoinduced charge separation after electron transfer from amines to 3Q* and the subsequent charge recombination or neutralization are supported by time-resolved conductivity measurements. The half-life of the decay kinetics of the semiquinone radical (.QH/Q.-) depends significantly on the donor and the medium. The photoconversion into the hydroquinones was measured under various conditions, the quantum yield, λirr = 254 nm, increases with increasing 2-propanol and TEA concentrations. The effects of quenching of 3Q*, the .QH/Q.- radicals and the photoconversion are outlined. The mechanisms of photoreduction of quinones in acetonitrile by 2-propanol are compared with those by TEA in benzene and acetonitrile, and the specific properties of substitution are discussed.