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Diethyl dithiophosphoric acid

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Diethyl dithiophosphoric acid
Names
Preferred IUPAC name O,O-Diethyl hydrogen phosphorodithioate
Other names O,O-Diethyl dithiophosphoric acid; Diethyl dithiophosphate; Diethyl phosphorodithioate; Diethyl ester of phosphorodithioic acid
Identifiers
CAS Number
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.005.506 Edit this at Wikidata
EC Number
  • 206-055-9
PubChem CID
RTECS number
  • TD7350000
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C4H11O2PS2/c1-3-5-7(8,9)6-4-2/h3-4H2,1-2H3,(H,8,9)Key: IRDLUHRVLVEUHA-UHFFFAOYSA-N
  • InChI=1/C4H11O2PS2/c1-3-5-7(8,9)6-4-2/h3-4H2,1-2H3,(H,8,9)Key: IRDLUHRVLVEUHA-UHFFFAOYAW
SMILES
  • CCOP(=S)(OCC)S
Properties
Chemical formula C4H11O2PS2
Molar mass 186.22 g·mol
Appearance colorless liquid
Melting point < 0 °C (32 °F; 273 K)
Boiling point 66 °C (151 °F; 339 K) at 1 mmHg
Hazards
GHS labelling:
Pictograms GHS05: CorrosiveGHS06: Toxic
Signal word Danger
Hazard statements H301, H311, H314, H330
Precautionary statements P260, P264, P270, P271, P280, P284, P301+P310, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P320, P321, P322, P330, P361, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
3 2 1
Flash point 82 °C (180 °F; 355 K)
Autoignition
temperature 		538 °C (1,000 °F; 811 K)
Lethal dose or concentration (LD, LC):
LD50 (median dose) 500 mg/kg (rabbit, dermal)
4510 mg/kg (rat, oral)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

Diethyl dithiophosphoric acid, sometimes mistakenly called diethyl dithiophosphate, is the organophosphorus compound with the formula (C2H5O)2PS2H. It is the processor for production of the organophosphate insecticide Terbufos. Although samples can appear dark, it is a colorless liquid.

It is prepared by treating phosphorus pentasulfide with ethanol:

P2S5 + 4 C2H5OH → 2 (C2H5O)2PS2H + H2S

Reactions

Zinc dithiophosphate.

Diethyl- and dimethyl dithiophosphoric acids react with bases. The results of this neutralization reaction are salts, e.g., ammonium diethyl dithiophosphate.

Diethyl dithiophosphoric acid reacts with zinc oxide to give zinc dithiophosphate, which is used as an oil additive:

ZnO + 2 (C2H5O)2PS2H → 2Zn + H2O

See also

References

  1. 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
  2. Lefferts, J. L.; Molloy, K. C.; Zuckerman, J. J.; Haiduc, I.; Guta, C.; Ruse, D. (1980). "Oxy and thio phosphorus acid derivatives of tin. 1. Triorganotin(IV) dithiophosphate esters". Inorganic Chemistry. 19 (6): 1662–1670. doi:10.1021/ic50208a046.
  3. Okuniewski, Andrzej; Becker, Barbara (2011). "Ammonium O,O′-diethyl dithiophosphate". Acta Crystallogr. E. 67 (7): o1749–o1750. doi:10.1107/S1600536811022811. PMC 3151957. PMID 21837134.
  4. H. Spikes "The history and mechanisms of ZDDP" Tribology Letters, Vol. 17, No. 3, October 2004. doi:10.1023/B:TRIL.0000044495.26882.b5.
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