DE855846C - Process for the manufacture of fungicidal products - Google Patents

Description

Process for the manufacture of fungicidal products It was found that very effective fungicidal products are obtained if I, 2, 4-trichloro-3, 5-dinitrobenzene are used with high molecular weight polyoxy compounds or their ethers.

The I, 2, 4-trichloro-3, 5-dinitrobenzene is by nitrating 1, 2,4-Trichlorobellzene easily available, which in turn is made from hexachlorocyclohexane by splitting off hydrogen chloride. Suitable high molecular weight polyoxy compounds are e.g.

Polysaccharides, such as cellulose, and their methyl, oxyethyl or glycolic acid ethers, also so-called wood ether carboxylic acid (i.e. reaction products of wood with chloroacetic acid) as well as starch, pectins, inulin or polyvinyl alcohol.

The implementation takes place by mixing or kneading the components, if desired in the presence of solvents or diluents such as water or Methanol. In order to bind the resulting hydrogen chloride, it is also used acid-inhibiting agents, such as alkali, are beneficial.

Appropriately, one uses z. 13. Cellulose in the form of alkali cellulose and the ethers containing caroxyl groups in the form of their alkali salts. The implementation generally proceeds when using 1 mole of 1,2,4-trichloro-3,5-dinitrobenzene per saccharide unit even at normal temperature over the course of several hours Completely; Heating up to about 2000 is conducive to dividing.

You can also use larger or smaller stoichiometric ratios use.

The reaction products obtained are easily distributed in water and show a considerably greater fungicidal effect even when strongly diluted than 1,2-trichloro-3, s-dinitrol) enzol itself, without leaf damage like this to cause. That the combination of the weakly fungicidal 1,2,4-trichloro-3,5-dinitrobenzene with high molecular weight polyoxy compounds such an extraordinary increase in causes fungicidal effect is surprising; the also only weak fungicidal effect desMononitro- 1, 2,4-trichlorobenzene is used in combination with high molecular weight Polyoxy compounds, as was also found, decreased.

The parts mentioned in the examples are parts by weight.

Example I 240 parts of wood ether carboxylic acid, prepared according to the patent 712666, are in a kneader with a solution of 40 parts of caustic soda in 40 parts Water permeates well for 2 hours at normal temperature. Then adds gradually adding 272 parts of finely powdered 1,2,4-trichloro-3,5-dinitrobenzene and knead for 4 hours. The product obtained prevents the growth of Aspergillus niger cultures on agar-agar at a dilution of I: 30000 completely; at I: rooooo is another one strong growth inhibition to be observed.

Example 2 One carries in at ordinary temperature with stirring a solution of 100 parts of 1,2,4-trichloro-3, s-dinitrol) enzene in 350 parts of methanol loo parts of alkali cellulose. Then the mixture is heated to about 100 ° until the methanol has evaporated. The residue is finely ground in a ball mill. The product obtained shows effects similar to that obtained in Example I.

Example 3 Processing is carried out in a kneader at ordinary temperature 110 parts of the wood ether carboxylic acid mentioned in Example 1 with [o parts of water and 55 parts of I, 2, 4-trichloro-3, s-dinitrobenzene and crushed after 1/2 hour Knead the product obtained by milling for 3 hours in a ball mill. The effect is similar to that of the product obtainable according to Example 1.

Claims (1)

PATENT CLAIM Process for the manufacture of fungicidal products, thereby characterized in that one-I, 2, 4-trichloro-3. 5-dinitrobenzene with high molecular weight Reacts polyoxy compounds or their ethers.