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Chemistry

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Also known as: O-chlorophenol, 95-57-8, Phenol, 2-chloro-, 2-hydroxychlorobenzene, O-chlorphenol, Chlorophenol
Molecular Formula
C6H5ClO
Molecular Weight
128.55  g/mol
InChI Key
ISPYQTSUDJAMAB-UHFFFAOYSA-N
FDA UNII
K9KAV4K6BN

2-Chlorophenol
1 2D Structure

2-Chlorophenol

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
2-chlorophenol
2.1.2 InChI
InChI=1S/C6H5ClO/c7-5-3-1-2-4-6(5)8/h1-4,8H
2.1.3 InChI Key
ISPYQTSUDJAMAB-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C1=CC=C(C(=C1)O)Cl
2.2 Other Identifiers
2.2.1 UNII
K9KAV4K6BN
2.3 Synonyms
2.3.1 MeSH Synonyms

1. 2-monochlorophenol

2. O-chlorophenol

3. O-monochlorophenol

4. Ortho-chlorophenol

5. Ortho-monochlorophenol

2.3.2 Depositor-Supplied Synonyms

1. O-chlorophenol

2. 95-57-8

3. Phenol, 2-chloro-

4. 2-hydroxychlorobenzene

5. O-chlorphenol

6. Chlorophenol

7. 2-chloro-1-hydroxybenzene

8. O-chlorophenic Acid

9. Phenol, O-chloro-

10. 2-chloro-phenol

11. Rcra Waste Number U048

12. Nsc 2870

13. Mfcd00002159

14. K9kav4k6bn

15. 1-chloro-2-hydroxybenzene

16. Chebi:47083

17. Nsc-2870

18. Septi-kleen

19. Dsstox_cid_1544

20. 2-chlorophenol, >=99%

21. Dsstox_rid_76202

22. Dsstox_gsid_21544

23. Pine-o Disinfectant

24. Caswell No. 203

25. O-chlorphenol [german]

26. Ortho-chlorophenol

27. Cas-95-57-8

28. 2ch

29. Ccris 640

30. Hsdb 1415

31. Einecs 202-433-2

32. Unii-k9kav4k6bn

33. Rcra Waste No. U048

34. Epa Pesticide Chemical Code 062204

35. Orthochlorophenol

36. Ai3-09060

37. 2-chloro Phenol

38. 1wbo

39. O-chlorophenol, Solid

40. O-chlorophenol, Liquid

41. Chlorophenol (related)

42. Phenol,2-chloro

43. 2-chlorophenol, 98%

44. Wln: Qr Bg

45. 2-chlorophenol (2-cp)

46. Ec 202-433-2

47. O-chlorophenol [mi]

48. Schembl12279

49. Mls002454425

50. Bidd:er0681

51. 2-chlorophenol [hsdb]

52. Chembl108877

53. Dtxsid5021544

54. Bdbm36301

55. Nsc2870

56. Hms2267f05

57. Zinc402767

58. Amy40778

59. Cs-d1478

60. Tox21_201410

61. Tox21_300340

62. Stl281867

63. Akos000118966

64. Db03110

65. Ncgc00091286-01

66. Ncgc00091286-02

67. Ncgc00091286-03

68. Ncgc00254422-01

69. Ncgc00258961-01

70. 2-chlorophenol 10 Microg/ml In Methanol

71. 25167-80-0

72. Ps-11957

73. Smr000112048

74. 2-chlorophenol 100 Microg/ml In Methanol

75. P-phenylenediamine-o-chlorophenol Copolymer

76. Db-057591

77. 2-chlorophenol 1000 Microg/ml In Methanol

78. Ft-0611987

79. 2-chlorophenol 100 Microg/ml In Isopropanol

80. 2-chlorophenol, Saj First Grade, >=99.0%

81. 2-chlorophenol, Pestanal(r), Analytical Standard

82. Q176486

83. J-509162

84. F0001-2274

85. O-chlorophenol, Solid [un2020] [keep Away From Food]

86. 2-chlorophenol, Certified Reference Material, Tracecert(r)

87. O-chlorophenol, Liquid [un2021] [keep Away From Food]

2.4 Create Date
2004-09-16
3 Chemical and Physical Properties
Molecular Weight 128.55 g/mol
Molecular Formula C6H5ClO
XLogP32.1
Hydrogen Bond Donor Count1
Hydrogen Bond Acceptor Count1
Rotatable Bond Count0
Exact Mass128.0028925 g/mol
Monoisotopic Mass128.0028925 g/mol
Topological Polar Surface Area20.2 Ų
Heavy Atom Count8
Formal Charge0
Complexity74.9
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Therapeutic Uses

MEDICATION (VET): ANTISEPTIC

Rossoff, I.S. Handbook of Veterinary Drugs. New York: Springer Publishing Company, 1974., p. 106


5 Pharmacology and Biochemistry
5.1 Absorption, Distribution and Excretion

A number of rabbit studies have shown that metabolism of the monochlorophenols is principally via conjugation. In /one/ study, groups of 6 rabbits were treated by gavage with 171.3 mg/kg of 2-CP or 4-CP emulsified in water as a single dose. For both isomers, the 24-hour urine analysis indicated that between 78.1 and 88.3% of the administered dose was excreted as the glucuronide, and between 12.8 and 20.6% of the administered dose was excreted as the ethereal sulfate. A total of 101.7 and 101.1% of the administered 2-CP or 4-CP doses, respectively, was accounted for as urinary glucuronide and sulfate conjugates.

U.S. Dept Health & Human Services/Agency for Toxic Substances & Disease Registry; Toxicological Profile for Chlorophenols PB/99/166639 p.80 (July 1999). Available from, as of October 28, 2008: https://www.atsdr.cdc.gov/toxpro2.html#


... Absorbed from ... gastrointestinal tract & ... parenteral sites of injection. ... Excreted as conjugates of sulfuric & glucuronic acid. ... Urine darkens after standing. /Chlorophenols/

Clayton, G.D., F.E. Clayton (eds.) Patty's Industrial Hygiene and Toxicology. Volumes 2A, 2B, 2C, 2D, 2E, 2F: Toxicology. 4th ed. New York, NY: John Wiley & Sons Inc., 1993-1994., p. 1615-16


In general, chlorophenols are readily absorbed through the skin. Using the skin of the hairless mouse, aqueous solutions of 2-MCP, 2,4-DCP, and 2,4,6- T3CP readily penetrated the skin, provided that the compound was not ionized. In vitro studies on epidermal membranes from human skin taken at autopsy showed penetration by 2-MCP, 4-MCP, 2,4-DCP, and 2,4,6-T3CP. The lipophilic character of the solutes and their hydrogen-bonding capacity are the 2 main features determining this penetration.

WHO; Environmental Health Criteria Document No. 93: Chlorophenols other than Pentachlorophenol (95-57-8). Available from, as of November 11, 2008: https://www.inchem.org/pages/ehc.html


5.2 Metabolism/Metabolites

O-Chlorophenol yields o-chloroanisole in guinea pigs. /In rabbits/ o-chlorophenol yields 3-chlorocatechol. Yields o-chlorophenyl-beta-d-glucuronide & o-chlorophenyl sulfate. O-chlorophenol yields chloroquinol probably in rats.

Goodwin, B.L. Handbook of Intermediary Metabolism of Aromatic Compounds. New York: Wiley, 1976., p. C-36


The urinary and biliary excretion of (14)C-labeled o-chlorophenol were investigated in 12 species of freshwater fish when immersed in sublethal concentrations of the cmpd in the aquarium water for 48 hr. o-Chlorophenol sulfate and o-chlorophenol glucuronide were detected in both the aquarium water and the bile of all the fish species.

PMID:6880238 Layiwola PJ et al; Xenobiotica 13 (2): 107-13 (1983)


... Various chlorophenols are formed as intermediate metabolites during the microbiological degradation of the herbicides 2,4-D & 2,4,5-T and the pesticides Silvex, Ronnel, lindane, and benzene hexachloride. /Chlorophenols/

USEPA; Ambient Water Quality Criteria Doc: Chlorinated Phenols p.A-7 (1980) EPA 440/5-80-032


Mammalian metabolism of chlorobenzene yields 2-chlorophenol as /one of/ the major products.

Smith JRL et al; Xenobiotica 2: 215 (1972) as cited in USEPA; Ambient Water Quality Criteria Doc: Chlorinated Phenols p.C-10 (1980) EPA 440/5-80-032


5.3 Mechanism of Action

The major mode of action of chlorophenols appears to be the uncoupling of oxidative phosphorylation. The strength of the uncoupling effect is related to the degree of chlorination: PCP is the strongest inhibitor of oxidative phosphorylation, MCP the weakest. To a lesser extent, inhibition of oxidative phosphorylation is affected by the positions of the chlorine atoms on the molecule. There appears to be a relationship between chlorination and the toxicity of PCP and T4CP, although there is no clear-cut relationship between the degree of chlorination and toxicityin MCP, DCP, and the T3CP series. /chlorophenols/

WHO; Environmental Health Criteria Document No. 93: Chlorophenols other than Pentachlorophenol (95-57-8). Available from, as of November 11, 2008: https://www.inchem.org/pages/ehc.html


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