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.[1]
Names | |
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Preferred IUPAC name
O,O-Diethyl hydrogen phosphorodithioate | |
Other names
O,O-Diethyl dithiophosphoric acid; Diethyl dithiophosphate; Diethyl phosphorodithioate; Diethyl ester of phosphorodithioic acid
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Identifiers | |
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3D model (JSmol)
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ChEMBL |
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ChemSpider |
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ECHA InfoCard | 100.005.506 |
EC Number |
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PubChem CID
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RTECS number |
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UNII |
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CompTox Dashboard (EPA)
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Properties | |
C4H11O2PS2 | |
Molar mass | 186.22 g·mol−1 |
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: | |
Danger | |
H301, H311, H314, H330 | |
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) | |
Flash point | 82 °C (180 °F; 355 K) |
538 °C (1,000 °F; 811 K) | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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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 [77 °F], 100 kPa).
Infobox references
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It is prepared by treating phosphorus pentasulfide with ethanol:[2]
Diethyl- and dimethyl dithiophosphoric acids react with bases. The results of this neutralization reaction are salts, e.g., ammonium diethyl dithiophosphate.[3]
Diethyl dithiophosphoric acid reacts with zinc oxide to give zinc dithiophosphate, which is used as an oil additive:[4]