Insecticides thiophosphoric acid

Thiophosphoric acid insecticides and benzodiazepines yield reddish to bluish-violet-colored chromatogram zones on a colorless background. 

The detection limits for thiophosphoric acid insecticides are 100 ng and for benzodiazepines 20 ng substance per chromatogram zone. 

It is assumed that the hydrogen bromide released on the oxidation of thiophosphoric acid insecticides with N-bromosuccinimide or bromine vapors forms intensely fluorescent salt-like derivatives with 3-hydroxyflavones — such as robinetin [1, 2, 4]. 

Thiophosphoric Acid Derivatives. A fortunate combination of characteristics occurs in the phosphoric acid derivatives upon substitution of a sulfur atom for one of the oxygens of the parent compound Namely, the toxicity of the derivatives to higher forms of life is substantially diminished. while at the same rime, (he acaricidal and insecticidal powers, with... 

They are then reacted with a compound with a hydroxy group to the neutral 0,0,0-triesters of thiophosphoric acid as, for example, in the synthesis of the insecticide Methylparathion ... 

Let us now turn to an example of nucleophilic substitution involving a group of pollutants other than alkyl halides. We consider the hydrolysis of thiometon and disulfoton, two insecticides that were among the major contaminants that entered the Rhine River after the famous accident at Schweizerhalle in Switzerland in 1986 (Capel et al., 1988). This example is representative for the hydrolysis of a variety of phosphoric and thiophosphoric acid derivatives (e.g., esters, thioesters, see Fig. 1), and it illustrates that hydrolysis of a more complex molecule may be somewhat more complicated. The kinetic data, as well as the proposed mechanisms of hydrolysis of thiometon and disulfoton, are presented in Table 4 and Figure 2, respectively. In these cases, the base catalyzed reaction... 

Dialkyl and diaryl dithiophosphoric acids are the bases of many high pressure lubricants, oil additives (see Lubrication and lubricants), and ore flotation chemicals (see Mineral recovery and processing). Organophosphoms insecticides such as Parathion are made by chlorination of the appropriate diaLkyl dithiophosphate and subsequent reaction of the intermediate dialkyl thiophosphoric chloride with sodium -nitrophenolate according to the following (see... 

Thiophosphoric and thiophosphonic acid ester aza analogues (297) of the benzoxazolone insecticide Phosalone (296) have high insecticidal, acaricidal and anthelmintic activities with very low mammalian toxicities (76HCA1593). 

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