DE974569C - Pest repellants - Google Patents

Description

ISSUED MARCH 2, 1961

C 6368 IV a 145 I.

is used

The present invention relates to pesticides, which are characterized by a content of a condensation product of one mole each of a lower trialkyl phosphite and one optionally substituted alkyl trichloroacetate.

The condensation products act on the various stages of development of the pests, such as Eggs, larvae, imagines, with an effect as a contact poison, food poison or respiratory poison.

A wide variety of bodies can be protected against pests, both gaseous as well as liquid or solid bodies can be used as carriers of the active substance. As such body to be protected or to be used as a carrier come into question z. B. air, in particular in premises, then liquids, such as B. water in ponds, and finally any dead and living solid surface, such as B. any objects in occupied rooms, in basements, in Screeds, in stables, also furs, feathers, wool and the like, as well as living beings of the plant and animal kingdom in their various stages of development, provided they are in relation to pesticides are insensitive.

The control of the pests is carried out according to conventional methods, e.g. B. by treating the body to be protected with the compounds in vapor form, e.g. B. as fumigants or in the form of Dusts or sprays z. B. as solutions or

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Suspensions made with water or suitable organic solvents, such as. B. alcohol, petroleum, Tar distillates, inter alia, have been prepared; Aqueous solutions or aqueous emulsions can also be used of organic solvents that contain the active substances, for painting, spraying or Dipping the objects to be protected are used.

The spraying and dusting agents can be the usual inert fillers or drawing agents, such as. B.

ίο kaolin, gypsum or bentonite, or other additives, such as sulphite cellulose waste liquor, cellulose derivatives and the like, also to improve the network and adhesive strength contain the usual wetting agents and adhesives mixed in. The pest control preparations can in powder form, in the form of aqueous dispersions or pastes or as self-dispersing oils will.

The compounds can be present as the only active ingredients in a pesticide or in combination with other insecticides and / or fungicides. The use of such preparations in crop protection is carried out according to the usual spraying, dusting and smoking processes. Suitable Substituted compounds can have a therapeutic, so-called systemic effect on plants exhibit.

Some of the compounds to be used according to the invention are known or can be prepared in analogy to the known compounds are established.

As components for the condensation, for. B. Consider on the one hand triethyl phosphite, triethyl phosphite, Tripropyl phosphite or tri- (2-chloroethyl) phosphite and on the other hand trichloroacetic acid ethyl ester, Trichloroacetic acid-zS-chloroethyl ester or Trichloroacetic acid (dichloroisopropyl) ester.

The preparation of the compounds to be used according to the invention from the components mentioned takes place through conversion in a molecular ratio. Because the reaction is often exothermic, it may be necessary to combine the components with cooling and with inert solvents, such as benzene, toluene, ether, dioxane, hexane or low-boiling gasoline, to be diluted. The reaction is advantageously terminated by heating to about 50 to 120.degree. With a suitable choice of the reaction components, the condensation products can be distill under reduced pressure.

US Pat. No. 2,485,573 discloses condensation products of dialkyl phosphites and chloral known as an insecticide. In these products, chloral is attached to the dilakyl phosphite without splitting off another connection. In contrast, for the production of the invention to products using, inter alia, trialkyl phosphites and takes place during the condensation the splitting off of a compound. The compounds known from the USA patent specification am closest comparable products of the present invention are characterized by a superior ovicide Effect from, as comparative tests showed.

In the following examples, parts mean parts by weight. The ratio of part by weight to Volume part is the same as that between the kilogram and the liter. The temperatures are given in degrees Celsius.

example 1

In the following the preparation of some of the compounds to be used according to the invention is given, protection for these processes is not claimed under this property right.

19 parts of ethyl trichloroacetate are mixed with 16.6 parts of triethyl phosphite and left to stand. After a short time, the reaction begins and the temperature is kept ^{at 60 to 70 0 by cooling.} When the temperature no longer increases, the mixture is heated to 70 to 80 ° for 2 hours. The solution turns light red and cloudy. Then, the reaction mixture in vacuo, the water jet pump is heated to 120 ⁰ with 6.5 parts distilling off first runnings. The residue is then distilled in a high vacuum. At 10 3 to 10 5%, the condensation product passes over in good yield as a colorless oil. If, instead of ethyl trichloroacetate, an equivalent amount of trichloroacetic acid (/ 3-chloroethyl) ester is used, an oil boiling at 125 to 130% is obtained. In the same way, triethyl phosphite can also be reacted with trichloroacetic acid (dichloroisopropyl) ester, a colorless oil with a boiling point of 14870.4 mm being obtained. If ethyl trichloroacetate is allowed to act on triethyl phosphite, a condensation product is obtained which is a. is colorless, boiling at 117 to 110.70.2 mm with a faint, mercaptan-like odor. The condensation product obtainable from trichloroacetic acid ethyl ester and triisopropyl phosphite is a yellowish colored oil.

Example 2

The following procedure can be used to produce a winter spraying agent.

5 parts of the condensation product of triethyl phosphite and trichloroacetic acid (| S-chloroethyl) ester are mixed, 10 parts of a non-ionic emulsifying and wetting agent, 80 parts spindle oil and 5 parts oleic acid, resulting in a clear oily liquid which can be emulsified by pouring into water.

Are injected shortly thoroughly before bud break in spring fruit trees with an i ° / _o strength spray liquor of the above-mentioned concentrated preparation, the overwintering eggs of aphids, Frostspannern, ermine moths, leaf suckers and red spiders are killed. The treatment can be combined with one with copper preparations.

Example 3

2 parts of the condensation product of triethyl phosphite and trichloroacetic acid (/? - chloroethyl) ester are mixed, 1 part of a non-ionic wetting and emulsifying agent and 7 parts of ethylene diglycol.

This preparation can be used to kill aphids, for example. It became a comparative experiment carried out in which the effect of this

Preparation was compared with that of nicotine.

Two plots on the edge of a heavily infested with aphids potato field were one hand washed with a 2% _o aqueous spray mixture of the above-mentioned preparation (= o, 4 ° / ₀₀ active ingredient) and, secondly, with a 3 ° / ₀₀ strength spray liquor of 20 ° / _O nicotine preparation ( = _{0.6% 0} active ingredient) and then the repopulation by aphids from the ίο untreated field was followed, the following results being obtained.

Aphid re-infestation in% of an untreated plot

Shortly after the spray.

After 2 days

After 16 days

After 23 days

Above
preparation

O to 3

0 to 3

100

nicotine

50
100
100

This experiment clearly shows that the condensation product of triethyl phosphite and trichloroacetic acid (β -chloroethyl) ester has an intrinsic therapeutic effect.

If fruit trees, asters, beans or sunflowers are sprayed with a spray mixture containing 1 _% active ingredient, these plants can be freed from lice.

Example 4

The preparation described in Example 3 is also effective against Colorado beetles. Are potato plants with a 2 ° / _oo strength spray liquor (= o, 4 ° / ₀₀ drug) injected and placed on the perennials after 24 hours Colorado beetle larvae, these paralyzed after a further 24 hours and after 48 hours are dead.

Example 5

Talc is mixed with 1 to 3% of the condensation product from tetrachloroacetone and triethyl phosphite and thus receives a dust powder, the good one Kontaktin secticidal effects.

Claims (1)

Claim: Pesticides, characterized in that they contain a condensation product of one mole each of a lower trialkyl phosphite and an optionally substituted alkyl trichloroacetate. References considered: U.S. Patent No. 2,485,573. © 109 522/11 2.61