SU352435A1 - - Google Patents

Description

This invention relates to chemical weed control agents in crops of cultivated crops. It is known to use various phosphoric acid esters as herbicides, for example N-bicycloacetamide dithiophosphates. However, the compounds of this group are either not efficiently suppressing the growth of weeds, or are low selective for cultivated plants. It is proposed to use dithiophosphoric acid esters of the general formula as a new selective herbicide. P8-CH-C-X, R. where RI and R2 are the same or different and mean an alkyl, alkenyl or alkoxyalkyl group with up to 5 carbon atoms; X is a mixed or unsubstituted, saturated or unsaturated nitrogen-containing heterocyclic radical with the number of carbon atoms in the cycle from 4 to 7. The proposed compounds have significant herbicidal activity and are selective for a number of cultivated plants, such as wheat, oats, rice, corn, and others. Recommended doses for selective control of weeds are in the range of 1–5 kg / g. The forms of application of the proposed compounds are common - solutions, emulsions, suspensions, pastes, powders. They are prepared by known methods, generally used in the manufacture of pharmaceutical preparations of pesticides. They can be used in combination with other pesticides or with fertilizers. The process for preparing compounds of formula I is based on the reaction of the corresponding heterocyclic amides of haloacetic acid with dithiophosphoric acid ethyl esters. in tab. 1 presents separate compounds of general formula I

Table 1

Continued table. one

Example 1. Seeds of experimental plants were sown in prepared soil and a day after sowing they were treated with compounds of general formula I (Nos. 2, 3 and 17) in doses of 2 and 4. Vegetative plants of these types were also treated with the same doses. Three weeks after the treatment (in both cases), we took into account the herbicidal activity — and evaluated it according to the devi tal scale: 1 — no damage 4–5 — average damage 9 — full plant death.

The results of the experiment are presented in table. 2

table 2

Herbicidal activity, score

56

Experimental material testimony-RiOv

about high herbicide pretreatment / PS-CH-C-X

of fixed compounds and on the selectivity of RjO P ||

their actions in relation to cultivated plants-s o

Scientific research institutes (pshoishp, barley, oats, cotton, 5 where Ri and Ro are the same or different and ozvekkly), especially P10 in case of pre-emergence, use alkyl-, alkenyl- or alkoxyalkylNII group with up to 5 carbon atoms;

Subject of the invention whelp or unsaturated nitrogen-containing

1. The use of dithiophosphoric cis-carbon esters in a cycle from 4 to 7, as a herbalism of the general formula.

X is a substituted or unsubstituted, saturated heterocyclic radical with the number of atoms