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| | Edifenphos Basic information |
| Product Name: | Edifenphos | | Synonyms: | sra7847;Edifenphos 0.2;EDDP PERCHLORATE (5 AMPS/PKGE);BAY 78418;bay78418;BAYER 78418;bayer78418;Blastoff | | CAS: | 17109-49-8 | | MF: | C14H15O2PS2 | | MW: | 310.37 | | EINECS: | 241-178-1 | | Product Categories: | | | Mol File: | 17109-49-8.mol |  |
| | Edifenphos Chemical Properties |
| | Edifenphos Usage And Synthesis |
| Uses | Edifenphos is a foliar applied contact fungicide that provides both
protective and curative control of rice blast diseases caused by Pyricularia
oryzae. It also controls ear blight and stem rot in rice. | | Uses | Fungicide. | | Definition | ChEBI: An organic thiophosphate that is the O-ethyl-S,S-diphenyl ester of phosphorodithioic acid. Used to control a variety of fungal diseases on rice including blast, ear blight and stem rot. Edifenphos i
moderately toxic to mammals and fish but poses more of a risk to aquatic invertebrates. | | Metabolic pathway | Hydrolytic cleavage of the P-0 and P-S linkages affords the major
degradation and metabolic pathways of edifenphos. A unique transesterification
reaction yielded tri-S-phenyl and di-O-ethyl phosphorus
esters as minor products in soil and plant test systems (Scheme 1). | | Degradation | The hydrolytic DT50 values of edifenphos (1) at pH 7 and 9 at 25 °C
were 19 and 2 days, respectively (PM). [35S]Edifenphods egraded rapidly
in aqueous solution when exposed to UV light at 25-28 °C [DT50 ca. 3 days
(light exposed) vs. 19 days (dark control)]. Cleavage of the P-S linkage is
the primary degradation pathway. Thiophenol (2) was further oxidised
to form diphenyl disulfide (3), possibly during sample extraction, isolation
and analysis. Stepwise cleavage of the P-S and P-O linkages yielded
O-ethyl S-phenyl hydrogen phosphorothioate (4), S-phenyl dihydrogen
phosphorothioate (5), benezenesulfonic acid (6) and sulfuric acid as
major 35S-containing products, whereas O-ethyl dihydrogen phosphate
(7) and phosphoric acid were recovered from the phosphorus portion of
the molecule (Murai, 1977). | | Toxicity evaluation | Edifenphos shows no delayed neuropathic symptoms.
Safety intervals between spray and harvest for rice are
21 days in Japan with 0.2 mg of MRL (Maximum Residue
Limit). |
| | Edifenphos Preparation Products And Raw materials |
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