Triphenyl phosphate

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Triphenyl phosphate
IUPAC name
Triphenyl phosphate
115-86-6 YesY
ChEBI CHEBI:35033 YesY
ChEMBL ChEMBL454511 YesY
ChemSpider 7988 YesY
Jmol-3D images Image
PubChem 8289
Molar mass 326.28 g/mol
Appearance colourless solid
Density 1.184 g/mL
Melting point 48 to 50 °C (118 to 122 °F; 321 to 323 K)
Boiling point 244 °C (471 °F; 517 K) at 10 mm Hg
organic solvents
Vapor pressure 1 mmHg (193 °C)[1]
Main hazards harmful
Flash point 220 °C (428 °F; 493 K)[1]
Lethal dose or concentration (LD, LC):
1320 mg/kg (mouse, oral)
3500 mg/kg (rat, oral)[2]
US health exposure limits (NIOSH):
TWA 3 mg/m3[1]
TWA 3 mg/m3[1]
1000 mg/m3[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Triphenyl phosphate is the chemical compound with the formula OP(OC6H5)3. This colourless solid is the ester (triester) of phosphoric acid and phenol. It is used as a plasticizer and a fire retardant.[3]

Triphenylphosphate is prepared by the reaction of phosphorus oxychloride and phenol:

POCl3 + 3 HOC6H5 → OP(OC6H5)3 + 3 HCl

Safety considerations[edit]

Triphenylphosphate exhibits low acute toxicity by dermal or oral contact.[3]


  1. ^ a b c d e "NIOSH Pocket Guide to Chemical Hazards #0644". National Institute for Occupational Safety and Health (NIOSH). 
  2. ^ "Triphenyl phosphate". Immediately Dangerous to Life and Health. National Institute for Occupational Safety and Health (NIOSH). 
  3. ^ a b J. Svara, N. Weferling, T. Hofmann "Phosphorus Compounds, Organic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2006. doi:10.1002/14356007.a19_545.pub2