Dimethyl dithiophosphoric acid
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Preferred IUPAC name O,O-Dimethyl phosphorodithioate | |
Other names O,O-Dimethyl dithiophosphoric acid; Dimethyl dithiophosphate; Dimethyl phosphorodithioate; Dimethyl ester of phosphorodithioic acid | |
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ECHA InfoCard | 100.010.958 |
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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 |
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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 |
Chemical compound
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
References
- ^ 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
- ^ 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