SU728687A3 - Weeds fighting method - Google Patents

Abstract

1368416 Herbicidal 1,2,4-triazin-5-ones BAYER AG 17 May 1973 [18 May 1972] 23552/73 Heading C2C [Also in Division A5] 3 - Methyl - 4 - amino - 6 - phenyl - 1,2,4- triazin-5-one is obtained either by (a) reacting 1-phenylglyoxylic acid ethyl ester-2-acetylhydrazone (A) with hydrazine hydrate, or (b) reacting 1- phenyl - 1 - ethoxycarbonyl - 4 - chloro - 2,3- diaza-pentadiene (B) with hydrazine hydrate. By analoqous methods there may be obtained derivatives of the above triazin-5-one containing CH 3 , CF 3 , C2, C(CH 3 ) 3 , OCH 3 and NO 2 . Compound (A) may be obtained by reacting phenylglyoxylic acid ethyl ester with acetylhydrazine. Compound (B) may be obtained by reacting 1- phenylglyoxylic acid ethyl ester-2-acetylhydrazone with phosphorus pentachloride.

Description

The invention relates to chemical means of controlling undesirable vegetation, and in particular to methods of controlling weeds by treating her or her biotope with a herbicide based on 3-methyl-4-amino-5H-6-phenyl-1, 2,4- triazin-5-she. There are known methods for controlling weeds by treating a BOB plant with a herbicide based on 3-methylthio-4-methyl-5H-6-phenyl-1, 2,4-triaine-5-one 1. or 3-methoxy-4-methyl-5H-6-phenyl-1, 2,4-triazin-5-one 2. Closest to that proposed by the active ingredient of the herbicide, which is treated crops, is 3-methylthio-4-amino -5H-6-phenyl-1, 2,4-triazin-5-one 13. However, known herbicides based on 6-phenyl-1,2,4-triazin-5-one derivatives exhibit phytotoxicity to cultivated crops and in because of the low selectivity of the action can not be used in crops of beets. The aim of the invention is to increase the efficiency of the method of weed control by searching for a herbicidal agent by means of -3-5 where the field has been harvested or harvested by her or her biotope 6-phenylmethyl-4-amino-5H-1, 2,4- triazinone General formula I. X - hydrogen, methyl, trifluorine in amounts of 0.0001 - 10%. The proposed compounds can be studied in a known manner by reacting acetyl hydrazis with a C-ketocarboxylic acid with its ester. Table 1 gives the physicochemical actuality of the common ground form I compounds used as a quality herbicide. Table 1

Compound A (known) s 3-methylthio-4-amino-5H-b-phenyl-1, 2,4-triazin-5-one, ° compound B (known); {3 methoxycarbonylaminophenyl) -N- (3-methylphenyl) carbamate.

Example 1: Dovskhodovaya processing.

The seeds of beet, galinsog, poMaiii; KH of sprocket, nettle, and m tlyka were sown in the soil, which, after 1 day, was treated at a dose of 2.5-5 kg / ha and

Pre-emergence treatment

later, 3 nad.were accounting of the herbicidal activity on a scale of 0 on a scale of 0 — no damage; 1 - notice plant growth; 2 - noticeable damage; 3 - severe damage and only 50% of shoots; 4 - only 25% of shoots; 5 - full of death of plants

The results of the results are presented in table 2.

Reference - compound A.

 T a b l and c a

Example 2. Post-harvest processing. Plants of Bwsyuga, Stovnik, Bristles, Glyce, Sorghum, Highlander, and Eziritsa 5–15 cm high were treated in a dose

Post-harvest processing

Table 1,2,4 kg / ha with compound 1,2,3 and standard - compound B. After 3 weeks. an account of herbicidal activity was carried out. On a scale. j The test results are presented in table 3 ,.

Claims (3)

1. Patent of the USSR 296303, cl. A 01 N 8/22, 08.18.67. 2. Patent of the USSR 254420, cl. A 01 N 9/21, 04.16.66. 3. German patent 1542873, cl. 45 19/02, published. 12.06.70