2395-99-5

Basic information

• Product Name: p-Nitrophenyl radical
• Synonyms: p-Nitrophenyl radical
• CAS NO: 2395-99-5
• Molecular Formula: C₆H₄NO₂
• Molecular Weight: 0
• Mol File: 2395-99-5.mol
• Article Data: 6

Chemical Properties

• Melting Point: 86 °C
• Appearance: /
• CAS DataBase Reference: p-Nitrophenyl radical(CAS DataBase Reference)
• NIST Chemistry Reference: p-Nitrophenyl radical(2395-99-5)
• EPA Substance Registry System: p-Nitrophenyl radical(2395-99-5)

Safety Data

• Hazardous Substances Data: 2395-99-5(Hazardous Substances Data)

Usage

InChI:InChI=1/C6H4NO2/c8-7(9)6-4-2-1-3-5-6/h2-5H

Upstream product

• 14368-49-1 p-nitrobenzenediazonium 
• 2406-15-7 α-hydroxybenzyl radical 
• 100-05-0 4-nitrobenzenediazonium chloride 
• 100-00-5 1-chloro-4-nitrobenzene radical anion 
• 215781-75-2 C₃₂H₂₆N₂O₈ 
• 100-00-5 4-chlorobenzonitrile 
• 100-01-6 4-nitro-aniline 

Downstream Products

• 13122-36-6 nitrobenzene-4-d 
• 98-95-3 nitrobenzene 
• 636-98-6 p-nitrobenzene iodide 
• 100-00-5 4-chlorobenzonitrile 
• 586-78-7 para-nitrophenyl bromide 

Relevant articles and documents

-

-

Application of a new kinetic method in the investigation of cleavage reactions of haloaromatic radical anions

A simple kinetic method based on competition kinetics is presented for the measurement of cleavage rate constants of radical anions over the range of 107 - 5 × 109 s-1 in aprotic solvents. The standard potential for the formation of the radical anions may be extracted from the kinetic analysis as well. The method employs electrochemical steady-state or optical detection techniques and is an extension of the redox catalysis approach described previously in the literature. The applicability of the method is illustrated through a systematic study of the cleavage reactions for a number of short-lived haloaromatic radical anions. Interestingly, the radical anion of iodobenzene is found to be an intermediate in the homogeneous reduction of iodobenzene, even though recent investigations have shown that the corresponding heterogeneous reduction at an electrode surface proceeds by a concerted electron transfer-bond cleavage process. The nature of the cleavage reactions is discussed in terms of the activation driving force plot of the cleavage rate constants versus the relevant Gibbs energies. While the exergonic cleavage reactions follow a simple decay mechanism taking place at the halogen site, the endergonic processes are best described as intra-molecular electron transfers from the substituent to the carbon-halogen bond. Nevertheless, the overall intrinsic barrier is found to be relatively small (27-39 kJ mol-1) and it is suggested that the endergonic reactions may proceed by a stepwise mechanism, in which a σ* radical anion is formed as an intermediate prior to the formation of the dissociated products, the aryl radical and the halide. The above conclusions were supported by semi-empirical PM3 calculations of structures and charge distributions in the radical anions.

Kinetic and mechanistic studies of the nonchain radical nucleophilic substitution reactions

The kinetics of the radical nucleophilic substitution reaction of p- nitrochlorobenzene with the sodium salt of the ethyl α-cyanoacetate carbanion in dimethyl sulfoxide (DMSO) solution at 335.9, 340.1, 343.9, 347.7, and 351.4 K were determined by observing the increase of the UV- visible absorbance of the product, the ethyl α-cyano-α-(p- nitrophenyl)acetate carbanion. The activation energies and entropies for the single electron transfer (k1) and for the p-nitrochlorobenzene radical anion dissociation (k2) were obtained. These results strongly support the previous conclusion that the thermal nucleophilic substitution reactions of o- and p- nitrohalobenzenes with the sodium salt of ethyl α-cyanoacetate carbanion in DMSO solution proceed exclusively via a nonchain radical mechanism (Scheme II).