CH497124A - Organic phosphorus cpd used as pesticide - Google Patents

Abstract

Organic phosphorus cpd. used as pesticide Cpds. of formula (CH3O)2 -S-CH2-CO-NH-C2H4-O-CH3 are used to destroy insects and acarides during their various stages of development.

Description

  

  
 



  Pesticides
In the main patent no. 392 981 pesticides are described, which as an active component an organic phosphorus compound of the formula
EMI1.1
 contain, wherein R and R1 are alkyl, cycloalkyl, aralkyl, aryl or heterocyclic radicals, where R and R1 can also be members of a ring system, R2 is an alkyl radical interrupted by at least one oxygen atom or a sulfur atom or an aryloxyalkyl radical and R3 is hydrogen , an alkyl radical or the same radical as R2.



   It has now been found that, with agents which act as the active component, the compound of the formula
EMI1.2
 contain just as good results for pest control.



   The new compound is particularly suitable for combating harmful insects and acarids, the various stages of their development such as eggs, larvae and imagines are destroyed. The effect occurs both as a contact poison and as a food poison.



   The statements made in the main patent apply to the type of preparation of compound 1 and to its formulation into pesticides. The compound can be present as the only active ingredient in a pesticide or else in combination with other insecticides and / or fungicides.



   Manufacturing example
19.8 g of the K salt of dimethylthiol phosphoric acid are dissolved in 40 ml of acetone. A solution of 15.2 g of chloroacetic acid methoxyethylamide in 20 ml of acetone is added at room temperature, the mixture is stirred for one hour at room temperature and then for 3 hours at 40450 C, the precipitated KC1 is filtered off and the filtrate is evaporated in vacuo at 35400 C. After taking up the residue in methylene chloride, washing with NaHCOs solution and water and drying over Na2SO4, the solvent is removed in vacuo.



   The residue obtained is 22.3 g of the compound of the formula
EMI1.3
 as an oil that can be distilled in a high vacuum at 0.12 torr and 133-135 ° C.



   Analysis: S calculated 12.46%, found 11.9%
Biological example
A) 2 parts of the compound of formula (1) are mixed with 1 part of the condensation product of 1 mol of tert-octylphenol and 8 mol of ethylene oxide and 7 parts of isopropanol. A clear solution is obtained which can be used as a spray concentrate and which can be emulsified by pouring it into water.



   1. To determine the contact effect on aphids, the following experiment was carried out using spray liquors with 0.08, 0.04, 0.02 and 0.01% active ingredient content.



   Broad beans that were heavily infested with aphids were sprayed on all sides and checked after 48 hours and 96 hours. If complete kill was observed at the first control, aphid repopulation took place.

 

   The following result was achieved: Conc. Of the active ingredient Contact effect on aphids in the spray mixture after 48 hours after 96 hours.



     
0.08% 100% 100%
0.04% 100% 100%
0.02% 100% 100%
0.01% 100% 100%
B) To determine the penetration effect, the bean plants were sprayed with the active ingredient solution only from above in the direction of the stem axis. In this case, the test animals sitting on the underside of the leaves are not hit by the spray jet. The active substance acts on the pests through penetration.



   After 48 hours, the following percentage deaths were achieved for the specified active ingredient concentrations:
Conc. Of the active ingredient penetration after 48 hours in the spray mixture 0.08% 100%
0.04% 100%
0.02% 100% 0.01% 100%

 

Claims (1)

PATENT CLAIM Pesticide, characterized in that it has as the active component the compound of the formula EMI2.1 contains.