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Those with five organic substituents are rare, although P(C 6 H 5) 5 is known, being derived from P(C 6 H 5) 4 + by reaction with phenyllithium. Phosphorus ylides are unsaturated phosphoranes, known as Wittig reagents, e.g. CH 2 P(C 6 H 5) 3. These compounds feature tetrahedral phosphorus(V) and are considered relatives of phosphine oxides.
In organic chemistry, organophosphates (also known as phosphate esters, or OPEs) are a class of organophosphorus compounds with the general structure O=P(OR) 3, a central phosphate molecule with alkyl or aromatic substituents. [1] They can be considered as esters of phosphoric acid. Organophosphates are best known for their use as pesticides.
Because OP pesticides degrade quickly when exposed to air and light, they have been considered relatively safe to consumers. [20] However, OP residues may linger on fruits and vegetables. [21] Certain OP pesticides have been banned for use on some crops, For example, methyl parathion is banned from use on some crops and permitted on others. [22]
They are the organic compounds that contain a phosphate group in which one or more oxygen atoms is substituted by sulfur. Many are used as pesticides, some have medical applications, and some are used as oil additives. [1] They generally have the chemical formula (RO) 3 PS, [(RO) 2 P(S)O] −, R(RO) 2 PS, etc.
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