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2D Structure
Also known as: 88-99-3, 1,2-benzenedicarboxylic acid, O-phthalic acid, Benzene-1,2-dicarboxylic acid, Pathalic acid, O-dicarboxybenzene
Molecular Formula
C8H6O4
Molecular Weight
166.13  g/mol
InChI Key
XNGIFLGASWRNHJ-UHFFFAOYSA-N
FDA UNII
6O7F7IX66E

Phthalic Acid is a metabolite found in the aging mouse brain.
1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
phthalic acid
2.1.2 InChI
InChI=1S/C8H6O4/c9-7(10)5-3-1-2-4-6(5)8(11)12/h1-4H,(H,9,10)(H,11,12)
2.1.3 InChI Key
XNGIFLGASWRNHJ-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C1=CC=C(C(=C1)C(=O)O)C(=O)O
2.2 Other Identifiers
2.2.1 UNII
6O7F7IX66E
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Disodium Phthalate

2. Phthalate

3. Phthalic Acid, Copper Salt

4. Phthalic Acid, Dipotassium Salt

5. Phthalic Acid, Disodium Salt

6. Phthalic Acid, Monobarium Salt

7. Phthalic Acid, Monocalcium Salt

8. Phthalic Acid, Monoiron (2+) Salt

9. Phthalic Acid, Monolead (2+) Salt

10. Phthalic Acid, Monopotassium Salt

11. Phthalic Acid, Monoruthenium Salt

12. Phthalic Acid, Monosodium Salt

13. Phthalic Acid, Potassium Salt

14. Phthalic Acid, Potassium, Sodium Salt

15. Phthalic Acid, Sodium Salt

16. Potassium Hydrogen Phthalate

2.3.2 Depositor-Supplied Synonyms

1. 88-99-3

2. 1,2-benzenedicarboxylic Acid

3. O-phthalic Acid

4. Benzene-1,2-dicarboxylic Acid

5. Pathalic Acid

6. O-dicarboxybenzene

7. O-benzenedicarboxylic Acid

8. Acide Phtalique

9. Phthalicacid

10. Kyselina Ftalova

11. Ortho-phthalic Acid

12. Orthophthalic Acid

13. Mfcd00002467

14. Sunftal 20

15. Chembl1045

16. 6o7f7ix66e

17. Chebi:29069

18. Nsc-5348

19. Benzene-1,2-dicarboxylic Acid (phthalic Acid)

20. Acide Phtalique [french]

21. Kyselina Ftalova [czech]

22. Ccris 1446

23. Hsdb 1339

24. Nsc 5348

25. Einecs 201-873-2

26. Brn 0608199

27. Unii-6o7f7ix66e

28. Alizarinate

29. Naphthalinate

30. Phthalinate

31. Alizarinic Acid

32. Phthalinic Acid

33. Pathalc Acd

34. Ai3-02409

35. Naphthalinic Acid

36. O-carboxybenzoate

37. 4kww

38. Phthalsäure

39. O-carboxybenzoic Acid

40. O-benzenedicarboxylate

41. 1,2-benzenedioic Acid

42. Phthalic Acid, ~99%

43. Wln: Qvr Bvq

44. Phthalate Standard For Ic

45. Dsstox_cid_1484

46. Phthalic Acid, 99.5%

47. Bmse000391

48. Ec 201-873-2

49. Phthalic Acid [mi]

50. Schembl1808

51. Dsstox_rid_76178

52. Dsstox_gsid_21484

53. Phthalic Acid [hsdb]

54. 4-09-00-03167 (beilstein Handbook Reference)

55. Mls002152931

56. Phthalic Acid [usp-rs]

57. Dtxsid8021484

58. Zinc90750

59. Nsc5348

60. Hms3039e17

61. Hms3604j03

62. Phthalic Acid, Analytical Standard

63. Bcp15370

64. Hy-i0508

65. Str06656

66. Phthalic Acid, Reagent Grade, 98%

67. Tox21_200915

68. Bdbm50080272

69. Phthalic Acid [usp Impurity]

70. S6215

71. Stl168879

72. Akos000118898

73. Db02746

74. Cas-88-99-3

75. Ncgc00090869-01

76. Ncgc00090869-02

77. Ncgc00258469-01

78. Phthalic Acid, Acs Reagent, >=99.5%

79. Ac-14464

80. Bp-21159

81. Smr001224528

82. Cs-0009407

83. Fluorescein Impurity B [ep Impurity]

84. Ft-0622644

85. Ft-0673874

86. P0287

87. Phthalic Acid 100 Microg/ml In Acetonitrile

88. Phthalic Acid, Saj First Grade, >=99.0%

89. Phthalic Acid, Saj Special Grade, >=99.0%

90. C01606

91. Phthalic Acid, Vetec(tm) Reagent Grade, 98%

92. Phthalic Acid, Puriss. P.a., >=99.5% (t)

93. Ab-131/40237186

94. Q423876

95. Fluorescein Sodium Impurity B [ep Impurity]

96. J-523870

97. Z57127456

98. F3110-2832

99. Phthalic Acid, European Pharmacopoeia (ep) Reference Standard

100. Phthalic Acid, United States Pharmacopeia (usp) Reference Standard

2.4 Create Date
2004-09-16
3 Chemical and Physical Properties
Molecular Weight 166.13 g/mol
Molecular Formula C8H6O4
XLogP30.7
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count4
Rotatable Bond Count2
Exact Mass166.02660867 g/mol
Monoisotopic Mass166.02660867 g/mol
Topological Polar Surface Area74.6 Ų
Heavy Atom Count12
Formal Charge0
Complexity177
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Pharmacology and Biochemistry
4.1 Absorption, Distribution and Excretion

Probably excreted as phthalic acid. /From table/

Patty, F. (ed.). Industrial Hygiene and Toxicology: Volume II: Toxicology. 2nd ed. New York: Interscience Publishers, 1963., p. 1839


4.2 Metabolism/Metabolites

Yields 4,5-dihydroxyphthalic acid in Pseudomonas. /FROM TABLE/

Goodwin, B.L. Handbook of Intermediary Metabolism of Aromatic Compounds. New York: Wiley, 1976., p. 34


Dose effects of di(2-ethylhexyl)phthalate distribution, excretion, and binding to macromolecules were studied in rodents. The urinary di(2-ethylhexyl)phthalate metabolite profile was similar for all doses, except that free phthalic acid was 6 times greater on days 3 and 10 at the highest compared to the lowest dose.

PMID:7140694 Full text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1569009 Albro PW et al; Environmental Health Perspectives 45: 19-25 (1982)


The metabolism of di-(5-hexenyl)phthalate and di-(9-decenyl)phthalate was investigated in rats. Male CD rats received two oral doses of 3 to 12 uM/kg radiolabeled or unlabeled di-(5-hexenyl)phthalate and di-(decenyl)phthalate in cottonseed oil 24 hr apart. One third of the radioactivity was found in the urine. The metabolites were identified as mono-5-hexenyl-phthalate. Mono-5-hexenyl-phthalate comprised 21% of the total urinary phthalates while 5-hexenyl-phthalate glucuronide amounted to 13.2% and free 5-hexenyl-phthalate to 7.8%. In contrast no metabolites of di-(9-decenyl)phthalate were excreted as glucuronide conjugates and only a trace of free phthalic acid was detected although 40 to 50% of the compound was recovered in the urine. The distribution of the metabolic phthalates indicated a different metabolic pathway for di-(9-decenyl)phthalate and di-(5-hexenyl)phthalate. /It was/ concluded that the chemically reactive epoxide metabolite of phthalate with unsaturated side chains may play a role in the acute toxicity of di-(5-hexenyl)phthalate and di-(9-decenyl)phthalate.

PMID:6548067 Albro PW et al; Xenobiotica 14 (5): 389-98 (1984)


Phthalate grown cells readily oxidized dibutylphthalate, phthalate, 3,4-dihydroxyphthalate and protocatechuate. Phthalate-3,4-dioxygenase (and possibly the dihydrodiol dehydrogenase) was induced by phthalate or a metabolite and subsequent enzymes were inducible by protocatechuate or a subsequent metabolic product. During growth at 37 C, strain 12B gave clones at high frequency that had lost the ability to grow with phthalate esters.

PMID:7085570 Full text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC220188 Eaton RW, Ribbons DW; J Bacteriol 151 (l): 48-57 (1982)


For more Metabolism/Metabolites (Complete) data for PHTHALIC ACID (6 total), please visit the HSDB record page.


4.3 Mechanism of Action

Although it is well established that high dose administration of di(2-ethylhexyl)phthalate and its monoester metabolite induces severe testicular atrophy in rats the mechanisms of this testicular injury Is not clear. The present experiment was undertaken to examine the effects of di(2-ethylhexyl) phthalate and mono(2-ethylhexyl)phthalate on mitochondrial functions of rat testis. Di(2-ethylhexyl)phthalate and di-n-octyl phthalate, a di(2-ethylhexyl) phthalate isomer which causes less severe testicular injury did not inhibit the state 3 oxygen consumption up to 0.65 umol/mL in vitro. On the other hand, mono(2-ethylhexyl)phthalate and mono-n-octyl phthalate a metabolite of di-n-octyl phthalate inhibited the state 3 oxygen-consumption down to a concentration of 0.065 amble/mL. Testicular mitochondrial respiratory functions of rats administered 2 g/kg di(2-ethylhexyl) phthalate were lower than those of control or di-n-octyl phthalate treated rats. These differences were verified by characteristics of pharmacokinetic parameters and testicular concentrations of mono(2-ethylhexyl)phthalate and mono-n-octyl phthalate. It nay be suggested that a possible mechanism of testicular atrophy induced by di(2-ethylhexyl) phthalate may be due to direct inhibition by mono(2-ethylhexyl)phthalate (and partially di(2-ethylhexyl)phthalate) of the respiratory functions of Sertoli cell mitochondria in rat testis.

PMID:2350233 Oishi S; Arch Toxicol 64 (2): 143-7 (1990)


... phthalic acid and nonylphenol stimulated PXR-mediated transcription at concentrations comparable to those at which they activate estrogen receptor-mediated transcription using a transient reporter gene expression assay in COS-7 cells.

PMID:10707959 Masuyama H et al; Mol Endocrinol 14 (3): 421-8 (2000)