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  • Methoxy compounds
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    Dimethyl dithiophosphoric acid

    From Wikipedia - Reading time: 2 min
    Dimethyl dithiophosphoric acid
    DimethoxyPS2H.png
    Names
    Preferred IUPAC name
    O,O-Dimethyl phosphorodithioate
    Other names
    O,O-Dimethyl dithiophosphoric acid; Dimethyl dithiophosphate; Dimethyl phosphorodithioate; Dimethyl ester of phosphorodithioic acid
    Identifiers
    CAS Number
    3D model (JSmol)
    ChEBI
    ChemSpider
    ECHA InfoCard 100.010.958 Edit this at Wikidata
    EC Number
    • 212-053-9
    PubChem CID
    UNII
    CompTox Dashboard (EPA)
    InChI
    • InChI=1S/C2H7O2PS2/c1-3-5(6,7)4-2/h1-2H3,(H,6,7)
      Key: CZGGKXNYNPJFAX-UHFFFAOYSA-N
    • InChI=1/C2H7O2PS2/c1-3-5(6,7)4-2/h1-2H3,(H,6,7)
      Key: CZGGKXNYNPJFAX-UHFFFAOYAT
    SMILES
    • COP(=S)(OC)S
    Properties
    Chemical formula
    		 C2H7O2PS2
    Molar mass 158.17 g·mol−1
    Appearance colorless liquid
    Boiling point 62–64 °C (144–147 °F; 335–337 K) 0.5 mm Hg
    Hazards
    GHS labelling:
    Pictograms
    		 GHS02: FlammableGHS05: CorrosiveGHS07: Exclamation markGHS08: Health hazard
    Signal word
    		 Danger
    Hazard statements
    		 H226, H242, H290, H302, H314, H332, H361, H412
    Precautionary statements
    		 P201, P202, P210, P233, P234, P240, P241, P242, P243, P260, P261, P264, P270, P271, P273, P280, P281, P301+P312, P301+P330+P331, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P308+P313, P310, P312, P321, P330, P363, P370+P378, P390, P403+P235, P404, P405, P501
    NFPA 704 (fire diamond)
    3
    2
    1
    Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
    Infobox references

    Dimethyl dithiophosphoric acid is the organophosphorus compound with the formula (CH3O)2PS2H. It is the processor for production of the organothiophosphate insecticide Malathion. Although samples can appear dark, the compound is a colorless, distillable liquid.[1]

    It is prepared by treating phosphorus pentasulfide with methanol:[2]

    P2S5 + 4 CH3OH → 2 (CH3O)2PS2H + H2S

    See also[edit]

    • Ammonium diethyl dithiophosphate
    • Diethyl dithiophosphoric acid
    • Zinc dithiophosphate

    References[edit]

    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., "Oxy and thio phosphorus acid derivatives of tin. 1. Triorganotin(IV) dithiophosphate esters", Inorganic Chemistry 1980, volume 19, 1662-1670. doi:10.1021/ic50208a046
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