67922-21-8

Basic information

• Product Name: 1,2,4,7-TETRACHLORONAPHTHALENE
• Synonyms: 1,2,4,7-TETRACHLORONAPHTHALENE;CN-34;PCN-34
• CAS NO: 67922-21-8
• Molecular Formula: C₁₀H₄Cl₄
• Molecular Weight: 265.9508
• Mol File: 67922-21-8.mol
• Article Data: 1

Chemical Properties

• Boiling Point: 350.8°Cat760mmHg
• Flash Point: 173.2°C
• Appearance: /
• Density: 1.552g/cm³
• Vapor Pressure: 8.67E-05mmHg at 25°C
• Refractive Index: 1.665
• CAS DataBase Reference: 1,2,4,7-TETRACHLORONAPHTHALENE(CAS DataBase Reference)
• NIST Chemistry Reference: 1,2,4,7-TETRACHLORONAPHTHALENE(67922-21-8)
• EPA Substance Registry System: 1,2,4,7-TETRACHLORONAPHTHALENE(67922-21-8)

Safety Data

• Hazardous Substances Data: 67922-21-8(Hazardous Substances Data)

Usage

Family

Polychlorinated naphthalenes (PCNs)

Physical State

Crystalline solid

Color

White to brownish

Odor

Faint, pleasant

Solubility

Insoluble in water

Usage

Flame retardant in electrical equipment, lubricants, sealants, and paint additives

Environmental Persistence

Highly persistent

Bioaccumulation

Accumulates in fatty tissues of animals, including humans

Health Risks

Cancer, reproductive and developmental effects, damage to liver and immune system

Regulatory Status

Production and use banned or restricted in many countries

InChI:InChI=1/C10H4Cl4/c11-5-1-2-6-7(3-5)10(14)9(13)4-8(6)12/h1-4H

Upstream product

• 20020-02-4 1,2,3,4-tetrachloronaphthalene 

Relevant articles and documents

Degradation of one-side fully-chlorinated 1,2,3,4-tetrachloronaphthalene over Fe-Al composite oxides and its hypothesized reaction mechanism

The degradation of 1,2,3,4-tetrachloronaphthalene (CN-27) featuring a one-side fully-chlorinated aromatic ring, was evaluated over three of the prepared rod-like Fe-Al composite oxides (FeAl-1, FeAl-5 and FeAl-10). The results showed that their reactive activities were in the order of FeAl-5 ≈ FeAl-10 ? FeAl-1, which could be attributed to their different pore structural properties and reactive sites caused by the different phase interaction between iron species and the γ-Al2O3. The generation of trichloronaphthalenes (1,2,3-TrCN and 1,2,4-TrCN, i.e. CN-13 and CN-14), dichloronaphthalenes (1,2-DiCN, 1,3-DiCN, 1,4-DiCN and 2,3-DiCN, i.e. CN-3, CN-4, CN-5 and CN-10) and monochloronaphthalenes (1-MoCN and 2-MoCN, i.e. CN-1 and CN-2) suggested the occurrence of successive hydrodechlorination reactions. The amount of CN-14 exceeded that of CN-13 from 71.5% to 77.7% across the three different systems, revealing the preferred occurrence of the first hydrodechlorination step at the β-position. This is dissimilar to the preference at the α-position observed during the dechlorination of octachloronaphthalene (CN-75) over micro/nano Fe3O4. The structural differences between one-side and two-side fully-chlorinated aromatic rings would have a pronounced impact on the reactivity of the chlorine substitution position. The major hydrodechlorination pathway was judged to be CN-27 → CN-14 → CN-4 → CN-2. Additionally, the detected 1,2,3,4,6-pentachloronaphthalene (CN-50) and 1,2,4,6/7-tetrachloronaphthalenes (CN-33/34) suggested the reverse chlorination reaction also happened while the hydrodechlorination reaction was occurring. The C-Cl bond dissociation energies (BDEs) of the parent and daughter polychlorinated naphthalene (PCN) congener were calculated using density functional theory (DFT), to achieve a deeper understanding of a different product yield distribution.