P-Phenylenediamine

Last updated
p-Phenylenediamine
P-phenylenediamine.svg
Para-phenylenediamine-from-xtal-3D-bs-17.png
Para-phenylenediamine-from-xtal-3D-sf.png
Names
Preferred IUPAC name
Benzene-1,4-diamine
Other names
Paraphenylenediamine
1,4-Diaminobenzene
1,4-Phenylenediamine
Identifiers
3D model (JSmol)
749029
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.003.096 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 203-404-7
KEGG
PubChem CID
RTECS number
  • SS8050000
UNII
UN number 1673
  • InChI=1S/C6H8N2/c7-5-1-2-6(8)4-3-5/h1-4H,7-8H2 X mark.svgN
    Key: CBCKQZAAMUWICA-UHFFFAOYSA-N X mark.svgN
  • InChI=1/C6H8N2/c7-5-1-2-6(8)4-3-5/h1-4H,7-8H2
    Key: CBCKQZAAMUWICA-UHFFFAOYAD
  • Nc1ccc(N)cc1
Properties
C6H8N2
Molar mass 108.144 g·mol−1
AppearanceWhite crystalline solid, darkens upon exposure to air [1]
Melting point 145 to 147 °C (293 to 297 °F; 418 to 420 K) [1]
Boiling point 267 °C (513 °F; 540 K) [1]
10% at 40°C, 87% at 107 C, 100% at 140 C [2]
Vapor pressure <1 mmHg (20°C) [3]
Acidity (pKa)
  • 2.97 (doubly protonated form; 20 °C, H2O)
  • 6.31 (conjugate acid; 20 °C, H2O) [4]
-70.28·10−6 cm3/mol
Hazards
GHS labelling:
GHS-pictogram-skull.svg GHS-pictogram-exclam.svg GHS-pictogram-pollu.svg
Danger
H301, H311, H317, H319, H331, H410
P261, P264, P270, P271, P272, P273, P280, P301+P310, P302+P352, P304+P340, P305+P351+P338, P311, P312, P321, P322, P330, P333+P313, P337+P313, P361, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
[5]
NFPA 704.svgHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
0
0
Flash point 156 °C; 312 °F; 429 K [3]
400 °C (752 °F; 673 K)
Lethal dose or concentration (LD, LC):
80 mg/kg (rat, oral)
98 mg/kg (rat, oral)
145 mg/kg (guinea pig, oral) [6]
250 mg/kg (rabbit, oral)
100 mg/kg (cat, oral) [6]
NIOSH (US health exposure limits):
PEL (Permissible)
TWA 0.1 mg/m3 [skin] [3]
REL (Recommended)
TWA 0.1 mg/m3 [skin] [3]
IDLH (Immediate danger)
25 mg/m3 [3]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
X mark.svgN  verify  (what is  Yes check.svgYX mark.svgN ?)

p-Phenylenediamine (PPD) is an organic compound with the formula C6H4(NH2)2. This derivative of aniline is a white solid, but samples can darken due to air oxidation. [1] It is mainly used as a component of engineering polymers and composites like kevlar. It is also an ingredient in hair dyes and is occasionally used as a substitute for henna.

Contents

Production

PPD is produced via three routes. Most commonly, 4-nitrochlorobenzene is treated with ammonia and the resulting 4-nitroaniline is then hydrogenated:

Synthesis 1,4-Phenylendiamine.svg

In the DuPont route, aniline is converted to diphenyltriazine, which is then converted by acid-catalysis to 4-aminoazobenzene. Hydrogenation of the latter affords PPD. [7]

Synthesis 1,4-Phenylendiamine (2).svg

Uses

Precursor to polymers

PPD is a precursor to aramid plastics and fibers such as Kevlar and Twaron. These applications exploit PPD's difunctionality, i.e. the presence of two amines which allow the molecules to be strung together. This polymer arises from the reaction of PPD and terephthaloyl chloride. The reaction of PPD with phosgene gives the diisocyanate, a precursor to urethane polymers. [7]

Molecular structure of Kevlar: the monomer subunit is bolded, dashed lines indicate hydrogen bonds. Kevlar chemical structure H-bonds.svg
Molecular structure of Kevlar: the monomer subunit is bolded, dashed lines indicate hydrogen bonds.

Dyeing

This compound is a common hair dye. Its use is being supplanted by other aniline analogues and derivatives such as 2,5-diamino(hydroxyethylbenzene and 2,5-diaminotoluene). Other popular derivatives include tetraaminopyrimidine and indoanilines and indophenols. Derivatives of diaminopyrazole give both red and violet colours. [8] In these applications, the nearly colourless dye precursor oxidizes to the dye.

Rubber antioxidant

PPD is easily oxidized, and for this reason, derivatives of PPD are used as antiozonants in the production of rubber products (e.g., IPPD). The substituents (naphthyl, isopropyl, etc.) affect the effectiveness of their antioxidant roles as well as their properties as skin irritants. [9]

Other uses

A substituted form of PPD sold under the name CD-4 is also used as a developing agent in the C-41 color photographic film development process, reacting with the silver grains in the film and creating the colored dyes that form the image.

PPD is also used as a Henna surrogate for temporary tattoos. Its usage can lead to severe contact dermatitis.

PPD is also used as a histological stain for lipids such as myelin.

PPD is used by lichenologists in the PD test to aid identification of Lichens. [10] PPD is used extensively as a cross-linking agent in the formation of COFs (covalent organic frameworks), which have a number of applications in dyes and aromatic compounds adsorption.

Safety

The aquatic LD50 of PPD is 0.028 mg/L. [7] The U.S. Environmental Protection Agency reported that in rats and mice chronically exposed to PPD in their diet, it simply depressed body weights, and no other clinical signs of toxicity were observed in several studies. [11] One review of 31 English-language articles published between January 1992 and February 2005 that investigated the association between personal hair dye use and cancer as identified through the PubMed search engine found "at least one well-designed study with detailed exposure assessment" that observed associations between personal hair dye use and non-Hodgkin's lymphoma, multiple myeloma, acute leukemia, and bladder cancer, [12] but those associations were not consistently observed across studies. A formal meta-analysis was not possible due to the heterogeneity of the exposure assessment across the studies.

Patch test Epikutanni-test.jpg
Patch test

In 2005–06, it was the tenth-most-prevalent allergen in patch tests (5.0%). [13]

The CDC lists PPD as being a contact allergen. Exposure routes are through inhalation, skin absorption, ingestion, and skin and/or eye contact. Symptoms of exposure to PPD include throat irritation (pharynx and larynx), bronchial asthma, and sensitization dermatitis. [14] [15] Sensitization is a lifelong issue, which may lead to active sensitization to products, including but not limited to black clothing, various inks, hair dye, dyed fur, dyed leather, and certain photographic products. It was voted Allergen of the Year in 2006 by the American Contact Dermatitis Society.

Poisoning by PPD is rare in Western countries. [16] In contrast, poisoning by PPD has occurred in Eastern countries, such as Pakistan, where people have committed suicide by consuming it. [17]

See also

Related Research Articles

<span class="mw-page-title-main">Dimethylaniline</span> Chemical compound

N,N-Dimethylaniline (DMA) is an organic chemical compound, a substituted derivative of aniline. It is a tertiary amine, featuring a dimethylamino group attached to a phenyl group. This oily liquid is colourless when pure, but commercial samples are often yellow. It is an important precursor to dyes such as crystal violet.

<span class="mw-page-title-main">Aniline</span> Organic compound (C₆H₅NH₂); simplest aromatic amine

Aniline is an organic compound with the formula C6H5NH2. Consisting of a phenyl group attached to an amino group, aniline is the simplest aromatic amine. It is an industrially significant commodity chemical, as well as a versatile starting material for fine chemical synthesis. Its main use is in the manufacture of precursors to polyurethane, dyes, and other industrial chemicals. Like most volatile amines, it has the odor of rotten fish. It ignites readily, burning with a smoky flame characteristic of aromatic compounds. It is toxic to humans.

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<i>m</i>-Phenylenediamine Chemical compound

m-Phenylenediamine, also called 1,3-diaminobenzene, is an organic compound with the formula C6H4(NH2)2. It is an isomer of o-phenylenediamine and p-phenylenediamine. This aromatic diamine is a colourless solid that appears as needles, but turns red or purple on exposure to air due to formation of oxidation products. Samples often come as colourless flakes and may darken in storage.

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<i>o</i>-Anisidine Chemical compound

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References

  1. 1 2 3 4 Merck Index , 11th Edition, 7256
  2. ↑ "P-Phenylenediamine (1,4-Diaminobenzene)". Archived from the original on 2012-03-13. Retrieved 2011-07-14.
  3. 1 2 3 4 5 NIOSH Pocket Guide to Chemical Hazards. "#0495". National Institute for Occupational Safety and Health (NIOSH).
  4. ↑ Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. pp. 5–89. ISBN   978-1498754286.
  5. ↑ "p-Phenylenediamine MSDS". Thermo Fisher Scientific.
  6. 1 2 "p-Phenylene diamine". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  7. 1 2 3 Ullmann's Encyclopedia of Industrial Chemistry (1 ed.). Wiley. 2003-03-11. doi:10.1002/14356007.a19_405. ISBN   978-3-527-30385-4.
  8. ↑ Thomas Clausen et al. "Hair Preparations" in Ullmann's Encyclopedia of Industrial Chemistry, 2007, Wiley-VCH, Weinheim. doi : 10.1002/14356007.a12_571.pub2
  9. ↑ Hans-Wilhelm Engels et al., "Rubber, 4. Chemicals and Additives" in Ullmann's Encyclopedia of Industrial Chemistry, 2007, Wiley-VCH, Weinheim. doi : 10.1002/14356007.a23_365.pub2
  10. ↑ "Chemical Tests". The British Lichen Society. Retrieved 2019-04-30.
  11. ↑ p-Phenylenediamine, U.S. Environmental Protection Agency
  12. ↑ Rollison, DE; Helzlsouer, KJ; Pinney, SM (2006). "Personal hair dye use and cancer: a systematic literature review and evaluation of exposure assessment in studies published since 1992". Journal of Toxicology and Environmental Health Part B: Critical Reviews. 9 (5): 413–39. Bibcode:2006JTEHB...9..413R. doi:10.1080/10937400600681455. PMID   17492526. S2CID   23749135.
  13. ↑ Zug, Kathryn A.; Warshaw, Erin M.; Fowler, Joseph F.; Maibach, Howard I.; Belsito, Donald L.; Pratt, Melanie D.; Sasseville, Denis; Storrs, Frances J.; Taylor, James S.; Mathias, C. G. Toby; Deleo, Vincent A.; Rietschel, Robert L.; Marks, James (2009). "Patch-test results of the North American Contact Dermatitis Group 2005-2006". Dermatitis: Contact, Atopic, Occupational, Drug. 20 (3): 149–160. doi:10.2310/6620.2009.08097. ISSN   2162-5220. PMID   19470301. S2CID   24088485.
  14. ↑ "The NIOSH Pocket Guide to Chemical Hazards". Archived from the original on 2017-10-24. Retrieved 2017-09-07.
  15. ↑ "NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) entry for p-Phenylenediamine (PPD)". Archived from the original on 2010-03-31. Retrieved 2017-09-07.
  16. ↑ Ashraf, W.; Dawling, S.; Farrow, L. J. (1994). "Systemic Paraphenylenediamine (PPD) Poisoning: A Case Report and Review". Human & Experimental Toxicology. 13 (3): 167–70. Bibcode:1994HETox..13..167A. doi:10.1177/096032719401300305. PMID   7909678. S2CID   31229733.
  17. ↑ Omer Sultan, Muhammad; Inam Khan, Muhammad; Ali, Rahmat; Farooque, Umar; Hassan, Syed Adeel; Karimi, Sundas; Cheema, Omer; Pillai, Bharat; Asghar, Fahham; Javed, Rafay (2020-05-29). "Paraphenylenediamine (Kala Pathar) Poisoning at the National Poison Control Center in Karachi: A Prospective Study". Cureus. 12 (5): e8352. doi: 10.7759/cureus.8352 . ISSN   2168-8184. PMC   7325408 . PMID   32617225.
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