AU4755300A - Substituted n-cyano amidines - Google Patents

Description

Substituted N-cyano-amidines The invention relates to novel substituted N-cyano-amidines, to a process for their preparation and to their use as herbicides. 5 It is already known that certain substituted N-cyano-guanidines have herbicidal properties (cf. DE-A-2505301, US-A-4661520, US-A-4684398, US-A-4689348, J. Agric. Food Chem. 37 (1989), 809-814). However, various aspects of the properties of the substituted N-cyano-guanidines of the prior art do not meet the high 10 requirements for modem crop treatment agents. This invention now provides the novel substituted N-cyano-amidines of the general formula (I), R 2 R riN IH N ~CN 15 in which Ri represents hydrogen or represents in each case optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aryl or arylalkyl and 20 R2 represents in each case benzo-fused, pyrido-fused or thieno-fused cycloalk(en)yl, oxacycloalk(en)yl or thiacycloalk(en)yl, where all cyclic and heterocyclic groupings may be substituted. The general formula (I) includes the E and Z configuration isomers which are 25 possible in each case. In the definitions, the hydrocarbon chains, such as alkyl, alkenyl or alkinyl, are in each case straight-chain or branched.

-2 Preferred substituents of the radicals listed in the formulae mentioned above and below are illustrated below. Ri preferably represents hydrogen, represents optionally cyano-, halogen-, 5 CI-C 4 -alkoxy-, C 1

-C

4 -alkylthio-, C 1

-C

4 -alkylsulphinyl- or C 1

-C

4 -alkyl sulphonyl-substituted alkyl having 1 to 6 carbon atoms, represents in each case optionally halogen-substituted alkenyl or alkinyl having in each case 2 to 6 carbon atoms, represents in each case optionally cyano-, halogen- or C 1

-C

4 alkyl-substituted cycloalkyl or cycloalkylalkyl having in each case 3 to 6 10 carbon atoms in the cycloalkyl groups and optionally 1 to 4 carbon atoms in the alkyl moiety, or represents in each case optionally nitro-, cyano-, halogen-,

C

1

-C

4 -alkyl-, C 1

-C

4 -halogenoalkyl-, C 1

-C

4 -alkoxy- or C 1

-C

4 -halogenoalkoxy substituted aryl or arylalkyl having in each case 6 or 10 carbon atoms in the aryl groups and optionally 1 to 4 carbon atoms in the alkyl moiety. 15 R2 preferably represents in each case benzo-fused, pyrido-fused or thieno-fused cycloalk(en)yl, oxacycloalk(en)yl or thiacycloalk(en)yl from the list below, 0 S N N 20 S S SC S

S

-3 where all cyclic and heterocyclic groupings may preferably be substituted by one of the groupings listed below: 5 nitro, hydroxyl, amino, cyano, carbamoyl, thiocarbamoyl, formylamino, halogen, CI-C 4 -alkyl, C1-C 4 -halogenoalkyl, CI-C 4 -alkoxy, C 1

-C

4 -halogeno alkoxy, C 1

-C

4 -alkylthio, C 1

-C

4 -halogenoalkylthio, C 1

-C

4 -alkylsulphinyl,

C

1

-C

4 -halogenoalkylsulphinyl,

C

1

-C

4 -alkylsulphonyl, C 1

-C

4 -halogenoalkyl sulphonyl, C 1

-C

4 -alkylamino, di-(C 1

-C

4 -alkyl)-amino, C 1

-C

4 -alkyl-carbonyl, 10 C 1

-C

4 -alkoxy-carbonyl,

C

1

-C

4 -alkylamino-carbonyl, di-(C 1

-C

4 -alkyl)-amino carbonyl, C 1

-C

4 -alkyl-carbonyl-amino, C 1

-C

4 -alkoxy-carbonyl-amino, C 1

-C

4 alkyl-amino-carbonyl-amino, C1-C 4 -alkyl-sulphonyl-amino. RI particularly preferably represents hydrogen, represents in each case optionally 15 cyano-, fluorine, chlorine-, bromine-, methoxy-, ethoxy-, n- or i-propoxy-, methylthio-, ethylthio-, n- or i-propylthio-, methylsulphinyl-, ethylsulphinyl-, n- or i-propylsulphinyl-, methylsulphonyl-, ethylsulphonyl-, n- or i-propyl sulphonyl-substituted methyl, ethyl, n- or i-propyl, n-, i-, s- or t-butyl, represents in each case optionally fluorine-, chlorine- or bromine-substituted 20 ethenyl, propenyl, butenyl, ethinyl, propinyl or butinyl, represents in each case optionally cyano-, fluorine-, chlorine-, bromine-, methyl-, ethyl-, n- or i propyl-substituted cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclo propylmethyl, cyclobutylmethyl, cyclopentylmethyl or cyclohexylmethyl, or represents in each case optionally nitro-, cyano-, fluorine-, chlorine-, 25 bromine-, methyl-, ethyl-, n- or i-propyl-, n-, i-, s- or t-butyl-, trifluoro methyl-, methoxy-, ethoxy-, n- or i-propoxy-, difluoromethoxy- or trifluoro methoxy-substituted phenyl or benzyl. R2 particularly preferably represents one of the cyclic and heterocyclic groupings 30 mentioned above, where the substituents may be selected from one of the groupings listed below: -4 nitro, hydroxyl, amino, cyano, carbomoyl, thiocarbomoyl, formylamino, fluorine, chlorine, bromine, methyl, ethyl, n- or i-propyl, n-, i-, s- or t-butyl, difluoromethyl, dichloromethyl, trifluoromethyl, trichloromethyl, chloro difluoromethyl, fluorodichloromethyl, methoxy, ethoxy, n- or i-propoxy, 5 difluoromethoxy, trifluoromethoxy, chlorodifluoromethoxy, fluorodichloro methoxy, methylthio, ethylthio, n- or i-propylthio, difluoromethylthio, trifluoromethylthio, chlorodifluoromethylthio, fluorodichloromethylthio, methylsulphinyl, ethylsulphinyl, trifluoromethylsulphinyl, methylsulphonyl, ethylsulphonyl, trifluoromethylsulphonyl, methylamino, ethylamino, n- or i 10 propylamino, dimethylamino, diethylamino, acetyl, propionyl, n- or i-but yroyl, methoxycarbonyl, ethoxycarbonyl, n- or i-propoxycarbonyl, methyl aminocarbonyl, ethylaminocarbonyl, n- or i-propylaminocarbonyl, dimethyl aminocarbonyl, diethylaminocarbonyl, acetylamino, propionylamino, n- or i butyroylamino, methoxycarbonylamino, ethoxycarbonylamino n- or i 15 propoxycarbonylamino, methylaminocarbonylamino, ethylaminocarbonyl amino, n- or i-propylaminocarbonylamino, methylsulphonylamino, ethyl sulphonylamino, n-or i-propylsulphonylamino. R very particularly preferably represents hydrogen and represents in each case 20 optionally cyano-, fluorine-, chlorine-, methoxy-, ethoxy-, n- or i-propoxy-, methylthio-, ethylthio-, methylsulphinyl-, ethylsulphinyl-, methylsulphonyl-, ethylsulphonyl-substituted methyl, ethyl, n- or i-propyl. R 2 very particularly preferably represents benzo-fused cycloalk(en)yl from the 25 list below where all cyclic groupings may be substituted by one of the groupings listed below: [lacuna] 30 -5 R most preferably represents hydrogen, methyl, ethyl of n- or i-propyl. R2 most preferably represents one of the groupings below:

NH

2 OH

CH

3 5 Preference according to the invention is given to the compounds of the formula (I) which contain a combination of the meanings listed above as being preferred. 10 Particular preference according to the invention is given to the compounds of the formula (I) which contain a combination of the meanings listed above as being particularly preferred. Very particular preference according to the invention is given to the compounds of 15 the formula (I) which contain a combination of the meanings listed above as being very particularly preferred. Most preference according to the invention is given to the compounds of the formula (I) which contain a combination of the meanings listed above as being most 20 preferred. The abovementioned general or preferred radical definitions apply both to the end products of the formula (I) and, correspondingly, to the starting materials or intermediates required in each case for the preparation. These radical definitions can 25 be combined with one another as desired, i.e. including combinations between the given preferred ranges.

-6 The novel substituted N-cyano-amidines of the general formula (I) have interesting biological properties. In particular, they have strong herbicidal activities. 5 The novel substituted N-cyano-amidines of the general formula (I) are obtained when N-cyano-imidates of the general formula (II) R' R O N~CN (II) N CN in which 10 Ri is as defined above and R' represents alkyl 15 are reacted with amino compunds of the general formula (III)

R

2 (III) H H in which R2 is as defined above, 20 if appropriate in the presence of a reaction auxiliary and if appropriate in the presence of a diluent. Using, for example, ethyl N-cyano-propaneimidate and indan-2-yl-amine as starting 25 materials, the course of the reaction in the process according to the invention can be illustrated by the formula scheme below: -7 C2H HC2 0 I2 + K NT CN'C H N H HSC 2 .N H The formula (II) provides a general definition of the N-cyano-imidates to be used as starting materials in the process according to the invention for preparing compounds 5 of the general formula (I). In the general formula (II), R 1 preferably has the meaning which has already been mentioned above, in connection with the description of the compounds of the general formula (I) according to the invention, as being preferred, particularly preferred, very particularly preferred or most preferred for R1; R' preferably represents alkyl having 1 to 4 carbon atoms, in particular methyl or ethyl. 10 The N-cyano-imidates of the general formula (II) are known and/or can be prepared by processes known per se (cf. J. Am. Chem. Soc. 104 (1982), 235-239; loc. cit. 106 (1984), 2805-2811; J. Org. Chem. 28 (1963), 1816-1821; loc. cit. 46 (1981), 1457 1465; Synthesis 1983, 402-404; Tetrahedron Lett. 21 (1980), 909-912). 15 The formula (III) provides a general definition of the amino compounds further to be used as starting materials in the process according to the invention for preparing compounds of the general formula (I). In the general formula (III), R2 preferably has that meaning which has already been mentioned above, in connection with the 20 description of the compounds of the general formula (I) according to the invention, as being preferred, particularly preferred, very particularly preferred or most preferred for R 2 . The amino compounds of the general formula (III) are known and/or can be prepared 25 by processes known per se (cf. J. Am. Chem. Soc. 88 (1966), 2233-2240; loc. cit. 95 (1973), 4083-4084); J. Chem. Soc. C 1966, 717-722; Synthesis 1980, 695-697; Tetrahedron 24 (1968), 3681-3696; loc. cit. 50 (1994), 3627-3638).

-8 The process according to the prevention for preparing compounds of the general formula (I) is, if appropriate, carried out using a reaction auxiliary. Reaction auxiliaries suitable for the process according to the invention are, in general, the 5 customary inorganic or organic bases or acidic acceptors. These preferably include alkali metal or alkaline earth metal acetates, amides, carbonates, bicarbonates, hydrides, hydroxides or alkoxides, such as, for example, sodium acetate, potassium acetate or calcium acetate, lithium amide, sodium amide, potassium amide or calcium amide, sodium carbonate, potassium carbonate or calcium carbonate, sodium 10 bicarbonate, potassium bicarbonate or calcium bicarbonate, lithium hydride, sodium hydride, potassium hydride or calcium hydride, lithium hydroxide, sodium hydroxide, potassium hydroxide or calcium hydroxide, sodium methoxide, ethoxide, n- or i-propoxide, n-, i-, s- or t-butoxide or potassium methoxide, ethoxide, n- or i propoxide, n-, i-, s- or t-butoxide; furthermore also basic organic nitrogen com 15 pounds, such as, for example, trimethylamine, triethylamine, tripropylamine, tributyl amine, ethyl-diisopropylamine, N,N-dimethyl-cyclohexylamine, dicyclohexylamine, ethyl-dicyclohexylamine, N,N-dimethyl-aniline, N,N-dimethyl-benzylamine, pyridine, 2-methyl-, 3-methyl-, 4-methyl-, 2,4-dimethyl-, 2,6-dimethyl-, 3,4 dimethyl- and 3,5-dimethyl-pyridine, 5-ethyl-2-methyl-pyridine, 4-dimethylamino 20 pyridine, N-methyl-piperidine, 1,4-diazabicyclo[2,2,2] -octane (DABCO), 1,5 diazabicyclo[4,3,0]-non-5-ene (DBN), or 1,8-diazabicyclo[5,4,0]-undec-7-ene (DBU). In most cases, the use of one of the reaction auxiliaries mentioned above can be 25 dispensed with. The process according to the invention for preparing compounds of the general formula (I) is preferably carried out using a diluent. Suitable diluents are, in addition to water, especially inert organic solvents. These include, in particular, aliphatic, 30 alicyclic or aromatic, optionally halogenated hydrocarbons, such as, for example, benzine, benzene, toluene, xylene, chlorobenzene, dichlorobenzene, petroleum ether, hexane, cyclohexane, dichloromethane, chloroform, carbon tetrachloride; ethers, such -9 as diethyl ether, diisopropyl ether, dioxane, tetrahydrofuran or ethylene glycol dimethyl ether or ethylene glycol diethyl ether; ketones, such as acetone, butanone or methyl isobutyl ketone, nitriles, such as acetonitrile, propionitrile or butyronitrile; amides, such as N,N-dimethylformamide, N-dimethylacetamide, N-methyl 5 formanilide, N-methyl-pyrrolidone or hexamethylphosphoric triamide; esters such as methyl acetate or ethyl acetate, sulphoxides such as dimethylsulphoxide, alcohols, such as methanol, ethanol, n- or i-propanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, mixtures thereof with water or pure water. 10 When carrying out the process according to the invention, the reaction temperatures can be varied within a relatively wide range. In general, the process is carried out at temperatures between 0 0 C and 150'C, preferably between 10*C and 120'C. 15 The process according to the invention is generally carried out under atmospheric pressure. However, it is also possible to carry out the process according to the invention under elevated or reduced pressure - in general between 0.1 bar and 10 bar. For carrying out the process according to the invention, the starting materials are 20 generally employed in approximately equimolar amounts. However, it is also possible to use a relatively large excess of in each case one of the components. The reaction is generally carried out in a suitable diluent in the presence of a reaction auxiliary, if appropriate, and the reaction mixture is generally stirred at the required temperature for a plurality of hours. Work-up is carried out by customary methods 25 (cf. the Preparation Examples). The active compounds according to the invention can be used as defoliants, desiccants, haulm killers and, especially, as weed killers. By weeds in the broadest sense there are to be understood all plants which grow in locations where they are 30 undesired. Whether the substances according to the invention act as total or selective herbicides depends essentially on the amount used. The active compounds according to the invention can be used, for example, in connection with the following plants: -10 Dicotyledonous weeds of the genera: Sinapis, Lepidium, Galium, Stellaria, Matricaria, Anthemis, Galinsoga, Chenopodium, Urtica, Senecio, Amaranthus, Portulaca, Xanthium, Convolvulus, Ipomoea, Polygonum, Sesbania, Ambrosia, 5 Cirsium, Carduus, Sonchus, Solanum, Rorippa, Rotala, Lindernia, Lamium, Veronica, Abutilon, Emex, Datura, Viola, Galeopsis, Papaver, Centaurea, Trifolium, Ranunculus, Taraxacum. Dicotyledonous crops of the genera: Gossypium, Glycine, Beta, Daucus, Phaseolus, 10 Pisum, Solanum, Linum, Ipomoea, Vicia, Nicotiana, Lycopersicon, Arachis, Brassica, Lactuca, Cucumis, Cucurbita. Monocotyledonous weeds of the genera: Echinochloa, Setaria, Panicum, Digitaria, Phleum, Poa, Festuca, Eleusine, Brachiaria, Lolium, Bromus, Avena, Cyperus, 15 Sorghum, Agropyron, Cynodon, Monochoria, Fimbristylis, Sagittaria, Eleocharis, Scirpus, Paspalum, Ischaemum, Sphenoclea, Dactyloctenium, Agrostis, Alopecurus, Apera, Aegilops, Phalaris. Monocotyledonous crops of the genera: Oryza, Zea, Triticum, Hordeum, Avena, 20 Secale, Sorghum, Panicum, Saccharum, Ananas, Asparagus, Allium. However, the use of the active compounds according to the invention is in no way restricted to these genera, but also extends in the same manner to other plants. 25 Depending on the concentration, the active compounds according to the invention are suitable for total weed control, for example on industrial terrain and railway tracks and on paths and areas with or without tree growth. Equally, the active compounds according to the invention can be employed for controlling weeds in perennial crops, for example forests, ornamental tree plantings, orchards, vineyards, citrus groves, nut 30 orchards, banana plantations, coffee plantations, tea plantations, rubber plantations, oil palm plantations, cocoa plantations, soft fruit plantings and hop fields, on lawns and turf and pastures and for selective weed control in annual crops.

- 11 The compounds of the formula (I) according to the invention have strong herbicidal activity and a broad activity spectrum when used on the soil and on rough-ground parts of plants. To a certain extent, they are also suitable for selective control of 5 monocotyledonous and dicotyledonous weeds in monocotyledonous and dicotyledonous crops, both by the pre-emergence and by the post-emergence method. The active compounds can be converted into the customary formulations, such as solutions, emulsions, wettable powders, suspensions, powders, dusts, pastes, soluble 10 powders, granules, suspo-emulsion concentrates, natural and synthetic substances impregnated with active compound, and microencapsulations in polymeric substances. These formulations are produced in a known manner, for example by mixing the 15 active compounds with extenders, that is to say liquid solvents and/or solid carriers, optionally with the use of surfactants, that is to say emulsifiers and/or dispersants and/or foam formers. If the extender used is water, it is also possible to use, for example, organic solvents 20 as auxiliary solvents. Liquid solvents which are suitable are mainly: aromatics, such as xylene, toluene or alkylnaphthalenes, chlorinated aromatics and chlorinated aliphatic hydrocarbons, such as chlorobenzenes, chloroethylenes or methylene chloride, aliphatic hydrocarbons, such as cyclohexane or paraffins, for example petroleum fractions, mineral and vegetable oils, alcohols, such as butanol or glycol, 25 and also their ethers and esters, ketones, such as acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone, strongly polar solvents, such as dimethylformamide and dimethyl sulphoxide, and water. Suitable solid carriers are for example ammonium salts and ground natural minerals, 30 such as kaolins, clays, talc, chalk, quartz, attapulgite, montmorillonite or diatomaceous earth, and ground synthetic minerals, such as finely divided silica, alumina and silicates; suitable solid carriers for granules are for example crushed and -12 fractionated natural rocks, such as calcite, marble, pumice, sepiolite, dolomite and synthetic granules of inorganic and organic meals, and granules of organic material, such as sawdust, coconut shells, maize cobs and tobacco stalks; suitable emulsifiers and/or foam formers are for example nonionic and anionic emulsifiers, such as 5 polyoxyethylene fatty acid esters, polyoxyethylene fatty alcohol ethers, for example alkylaryl polyglycol ethers, alkylsulphonates, alkyl sulphates, arylsulphonates and protein hydrolysates; suitable dispersants are for example lignosulphite waste liquors and methylcellulose. 10 Tackifiers, such as carboxymethylcellulose, natural and synthetic polymers in the form of powders, granules or latices, such as gum arabic, polyvinyl alcohol and polyvinyl acetate, and also natural phospholipids, such as cephalins and lecithins and synthetic phospholipids can be used in the formulations. Other possible additives are mineral and vegetable oils. 15 It is possible to use colorants, such as inorganic pigments, for example iron oxide, titanium oxide, Prussian blue, and organic dyestuffs, such as alizarin dyestuffs, azo dyestuffs and metal phthalocyanine dyestuffs, and trace nutrients, such as salts of iron, manganese, boron, copper, cobalt, molybdenum and zinc. 20 The formulations generally comprise between 0.1 and 95 per cent by weight of active compound, preferably between 0.5 and 90%. For controlling weeds, the active compounds according to the invention, as such or in 25 the form of their formulations, can also be used as mixtures with known herbicides, finished formulations or tank mixes being possible. Possible components for the mixtures are known herbicides, for example acetochlor, acifluorfen(-sodium), aclonifen, alachlor, alloxydim(-sodium), ametryne, 30 amidochlor, amidosulphuron, anilofos, asulam, atrazine, azafenidin, azimsulphuron, benazolin(-ethyl), benfuresate, bensulphuron(-methyl), bentazone, benzobicyclon, benzofenap, benzoylprop(-ethyl), bialaphos, bifenox, bispyribac(-sodium), bromo- -13 butide, bromofenoxim, bromoxynil, butachlor, butroxydim, butylate, cafenstrole, caloxydim, carbetamide, carfentrazone(-ethyl), chlomethoxyfen, chloramben, chlor idazon, chlorimuron(-ethyl), chlornitrofen, chlorsulphuron, chlorotoluron, cinidon (-ethyl), cinmethylin, cinosulphuron, clefoxydim, clethodim, clodinafop(-propargyl), 5 clomazone, clomeprop, clopyralid, clopyrasulphuron(-methyl), cloransulam(-methyl), cumyluron, cyanazine, cybutryne, cycloate, cyclosulphamuron, cycloxydim, cyhalofop(-butyl), 2,4-D, 2,4-DB, 2,4-DP, desmedipham, diallate, dicamba, diclofop(-methyl), diclosulam, diethatyl(-ethyl), difenzoquat, diflufenican, diflufenzopyr, dimefuron, dimepiperate, dimethachlor, dimethametryn, 10 dimethenamid, dimexyflam, dinitramine, diphenamid, diquat, dithiopyr, diuron, dymron, epropodan, EPTC, esprocarb, ethalfluralin, ethametsulphuron(-methyl), ethofumesate, ethoxyfen, ethoxysulphuron, etobenzanid, fenoxaprop(-P-ethyl), fentrazamide, flamprop(-isopropyl), flamprop(-isopropyl-L), flamprop(-methyl), flazasulphuron, florasulam, fluazifop(-P-butyl), fluazolate, flucarbazone, flufenacet, 15 flumetsulam, flumiclorac(-pentyl), flumioxazin, flumipropyn, flumetsulam, fluometuron, fluorochloridone, fluoroglycofen(-ethyl), flupoxam, flupropacil, flurpyrsulphuron(-methyl, -sodium), flurenol(-butyl), fluridone, fluroxypyr(-methyl), flurprimidol, flurtamone, fluthiacet(-methyl), fluthiamide, fomesafen, glufo sinate(-ammonium), glyphosate(-isopropylammonium), halosafen, haloxyfop 20 (-ethoxyethyl), haloxyfop(-P-methyl), hexazinone, imazamethabenz-(-methyl), imazamethapyr, imazamox, imazapic, imazapyr, imazaquin, imazethapyr, imazo sulphuron, iodosulphuron(-methyl, -sodium), ioxynil, isopropalin, isoproturon, isouron, isoxaben, isoxachlortole, isoxaflutole, isoxapyrifop, lactofen, lenacil, linuron, MCPA, MCPP, mefenacet, mesotrione, metamitron, metazachlor, 25 methabenzthiazuron, metobenzuron, metobromuron, (alpha-)metolachlor, meto sulam, metoxuron, metribuzin, metsulphuron(-methyl), molinate, monolinuron, naproanilide, napropamide, neburon, nicosulphuron, norflurazon, orbencarb, oryzalin, oxadiargyl, oxadiazon, oxasulphuron, oxaziclomefone, oxyfluorfen, para quat, pelargonic acid, pendimethalin, pendralin, pentoxazone, phenmedipham, 30 piperophos, pretilachlor, primisulphuron(-methyl), prometryn, propachlor, propanil, propaquizafop, propisochlor, propyzamide, prosulphocarb, prosulphuron, pyra flufen(-ethyl), pyrazolate, pyrazosulphuron(-ethyl), pyrazoxyfen, pyribenzoxim, -14 pyributicarb, pyridate, pyriminobac(-methyl), pyrithiobac(-sodium), quinchlorac, quinmerac, quinoclamine, quizalofop(-P-ethyl), quizalofop(-P-tefuryl), rimsulphuron, sethoxydim, simazine, simetryn, sulcotrione, sulphentrazone, sulpho meturon(-methyl), sulphosate, sulphosulphuron, tebutam, tebuthiuron, tepraloxydim, 5 terbuthylazine, terbutryn, thenylchlor, thiafluamide, thiazopyr, thidiazimin, thifen sulphuron(-methyl), thiobencarb, tiocarbazil, tralkoxydim, triallate, triasulphuron, tribenuron(-methyl), triclopyr, tridiphane, trifluralin and triflusulphuron. A mixture with other known active compounds, such as fungicides, insecticides, acaricides, nematicides, bird repellents, plant nutrients and agents which improve soil 10 structure, is also possible. The active compounds can be used as such, in the form of their formulations or in the use forms prepared therefrom by further dilution, such as ready-to-use solutions, suspensions, emulsions, powders, pastes and granules. They are used in the 15 customary manner, for example by watering, spraying, atomizing, scattering. The active compounds according to the invention can be applied both before and after the emergence of the plants. They can also be incorporated into the soil before sowing. 20 The amount of active compound used can vary within a relatively wide range. It depends essentially on the nature of the desired effect. In general, the amounts used are between 1 g and 10 kg of active compound per hectare of soil surface, preferably between 5 g and 5 kg per ha. 25 The preparation and the use of the active compounds according to the invention can be seen from the examples below.

-15 Preparation Examples: Example 1 H3C N 1 H NN NNCN 5 A mixture of 0.98 g (10 mmol) of methyl N-cyano-ethaneimidate, 1.42 g (10 mmol) of 1,2,3,4-tetrahydro-1-naphthylamine and 20 ml of water is stirred at room temperature (about 20'C) for 12 hours. The resulting crystalline product is then isolated by filtration with suction, washed with a little water and diethyl ether and 10 dried on a disc made of clay. This gives 1.3 g (62% of theory) of N'-cyano-N-(1,2,3,4-tetrahydro-1-naphthyl) ethaneimideamide of melting point 113'C. 15 Analogously to Example 1, and in accordance with the general description of the preparation process according to the invention, it is also possible to prepare, for example, the compounds of the general formula (I) listed in Table 1 below. R 2 R ' iN.,H CN 20 -16 Table 1: Examples of compounds of the formula (I) Ex. No. Ri R2 Melting point ('C) 2 H NH 2 162 0 C 3 H 148 4 CH 3

NH

2 180 5 CH 3 139 6 CH 3 -.. 176 HO (1R,2S) 7 CH 3 173 HO (lS,2R) 8 C 2

H

5 117 - 17 Ex. No. R R Melting point (C) 9

C

3

H

7 -n 149 10 C 2

H

5

NH

2 203 11

C

2

H

5 .. 140 HO (1R,2S) 12

C

2

H

5 ... 141 HO (1S,2R) 13

C

3

H

7 -n

NH

2 194 14 C 3

H

7 -n -.. (amorphous) HO (1R,2S) 15

C

3

H

7 -n (,) (amorphous) HO (1S,2R) - 18 Ex. No. R R2 Melting point ('C) 16 H H 3 C 223 17 H 149 HO (1R,2S) 18 H -.. 156 HO (1S,2R) 19 H 136 20

CH

3 206 21 C 2 11 5 150 22 C 3

H

7 -n 126 - 19 Ex. No. R R2 Melting point (*C) 23 H -... 105 24 C 2

H

5 .. 133 25 C 3

H

7 -n - 84 26 CH 3

OCH

3 27 CH 3

CH

3 152 0 28 CH 3

OCH

3 144 29 CH 3

OCH

3 142 30 CH 3 228 Br - 20 Ex. No. R R2 Melting point ('C) 31 CH 3 Br 205 32 CH 3 Br 204 33 CH 3

CH

3 34

CH

3

H

3 C

H

3 C 35 H

H

3 C

H

3

C

- 21 Use Examples: Example A 5 Pre-emergence Test Solvent: 5 parts by weight of acetone Emulsifier: 1 part by weight of alkylaryl polyglycol ether 10 To produce a suitable preparation of active compound, 1 part by weight of active compound is mixed with the stated amount of solvent, the stated amount of emulsifier is added and the concentrate is diluted with water to the desired concentration. 15 Seeds of the test plants are sown in normal soil. After about 24 hours, the soil is sprayed with the preparation of active compound such that the particular amount of active compound desired is applied per unit area. The concentration of the spray liquor is chosen such that the particular amount of active compound desired is applied in 1000 litres of water per hectare. 20 After three weeks, the degree of damage to the plant is rated in% damage in comparison to the development of the untreated control. The figures denote: 25 0% = no effect (like untreated control) 100% = total destruction In this test, for example, the compound of Preparation Example 1 shows strong 30 activity against weeds.

- 22 Example B Post-emergence Test 5 Solvent: 5 parts by weight of acetone Emulsifier: 1 part by weight of alkylaryl polyglycol ether To produce a suitable preparation of active compound, 1 part by weight of active compound is mixed with the stated amount of solvent, the stated amount of 10 emulsifier is added and the concentrate is diluted with water to the desired concentration. Test plants of a height of 5 - 15 cm are sprayed with the preparation of active compound such that the particular amounts of active compound desired are applied 15 per unit area. The concentration of the spray liquor is chosen such that the particular amounts of active compound desired are applied in 1000 1 of water/ha. After three weeks, the degree of damage to the plants is rated in% damage in comparison to the development of the untreated control. 20 The figures denote: 0% = no effect (like untreated control) 100% = total destruction 25 In this test, for example, the compound of Preparation Example 1 shows strong activity against weeds.

Claims (8)

1. Subtituted N-cyano-amidines of the general formula (I), R

2 R H 5 CN 5 in which Ri represents hydrogen or represents in each case optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aryl or arylalkyl and 10 R2 represents in each case benzo-fused, pyrido-fused or thieno-fused cycloalk(en)yl, oxacycloalk(en)yl or thiacycloalk(en)yl, where all cyclic and heterocyclic groupings may be substituted. 15 2. Compounds according to Claim 1, characterized in that R represents hydrogen, represents optionally cyano-, halogen-, C 1 -C 4 -alkoxy-, C1-C 4 -alkylthio-, C 1 -C 4 -alkylsulphinyl- or C 1 -C 4 -alkylsulphonyl-substituted alkyl having 1 to 6 carbon atoms, represents in each case optionally halogen 20 substituted alkenyl or alkinyl having in each case 2 to 6 carbon atoms, represents in each case optionally cyano-, halogen- or C 1 -C 4 -alkyl-substituted cycloalkyl or cycloalkylalkyl having in each case 3 to 6 carbon atoms in the cycloalkyl groups and optionally 1 to 4 carbon atoms in the alkyl moiety, or represents in each case optionally nitro-, cyano-, halogen-, C1-C 4 -alkyl-, C 1 25 C 4 -halogenoalkyl-, C1-C 4 -alkoxy- or C 1 -C 4 -halogenoalkoxy-substituted aryl or arylalkyl having in each case 6 or 10 carbon atoms in the aryl groups and optionally 1 to 4 carbon atoms in the alkyl moiety, and -24 R 2 represents in each case benzo-fused, pyrido-fused or thieno-fused cycloalk(en)yl, oxacycloalk(en)yl or thiacycloalk(en)yl from the list below, KI I () 0 S N N 5 S S S S S where all cyclic and heterocyclic groupings may preferably be substituted by 10 one of the groupings listed below: nitro, hydroxyl, amino, cyano, carbamoyl, thiocarbamoyl, formylamino, halogen, C 1 -C 4 -alkyl, C 1 -C 4 -halogenoalkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -halogeno alkoxy, C 1 -C 4 -alkylthio, C 1 -C 4 -halogenoalkylthio, C 1 -C 4 -alkylsulphinyl, 15 C 1 -C 4 -halogenoalkylsulphinyl, C 1 -C 4 -alkylsulphonyl, C 1 -C 4 -halogeno alkylsulphonyl, C 1 -C 4 -alkylamino, di-(C 1 -C 4 -alkyl)-amino, C 1 -C 4 -alkyl carbonyl, C 1 -C 4 -alkoxy-carbonyl, C 1 -C 4 -alkylamino-carbonyl, di (C1-C 4 -alkyl)-amino-carbonyl, C 1 -C 4 -alkyl-carbonyl-amino, CI-C 4 -alkoxy carbonyl-amino, C 1 -C 4 -alkyl-amino-carbonyl-amino, C1-C 4 -alkyl-sulphonyl 20 amino. -25

3. Compounds according to Claim 1 or 2, characterized in that Ri represents hydrogen, represents in each case optionally cyano-, fluorine-, chlorine-, bromine-, methoxy-, ethoxy-, n- or i-propoxy-, methylthio-, 5 ethylthio-, n- or i-propylthio-, methylsulphinyl-, ethylsulphinyl-, n- or i propylsulphinyl-, methylsulphonyl-, ethylsulphonyl-, n- or i-propylsulphonyl substituted methyl, ethyl, n- or i-propyl, n-, i-, s- or t-butyl, represents in each case optionally fluorine-, chlorine- or bromine-substituted ethenyl, propenyl, butenyl, ethinyl, propinyl or butinyl, represents in each case optionally cyano-, 10 fluorine-, chlorine-, bromine-, methyl-, ethyl-, n- or i-propyl-substituted cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclopropylmethyl, cyclo butylmethyl, cyclopentylmethyl or cyclohexylmethyl, or represents in each case optionally nitro-, cyano-, fluorine-, chlorine-, bromine-, methyl-, ethyl-, n- or i-propyl-, n-, i-, s- or t-butyl-, trifluoromethyl-, methoxy-, ethoxy-, n- or 15 i-propoxy-, difluoromethoxy- or trifluoromethoxy-substituted phenyl or benzyl, and R2 represents one of the cyclic and heterocyclic groupings mentioned in Claim 1 or 2, where the substituents may be selected from one of the groupings listed 20 below: nitro, hydroxyl, amino, cyano, carbamoyl, thiocarbamoyl, formylamino, fluorine, chlorine, bromine, methyl, ethyl, n- or i-propyl, n-, i-, s- or t-butyl, difluoromethyl, dichloromethyl, trifluoromethyl, trichloromethyl, chloro difluoromethyl, fluorodichloromethyl, methoxy, ethoxy, n- or i-propoxy, 25 difluoromethoxy, trifluoromethoxy, chlorodifluoromethoxy, fluorodichloro methoxy, methylthio, ethylthio, n- or i-propylthio, difluoromethylthio, trifluoromethylthio, chlorodifluoromethylthio, fluorodichloromethylthio, methylsulphinyl, ethylsulphinyl, trifluoromethylsulphinyl, methylsulphonyl, ethylsulphonyl, trifluoromethylsulphonyl, methylamino, ethylamino, n- or i 30 propylamino, dimethylamino, diethylamino, acetyl, propionyl, n- or i butyroyl, methoxycarbonyl, ethoxycarbonyl, n- or i-propoxycarbonyl, methylaminocarbonyl, ethylaminocarbonyl, n- or i-propylaminocarbonyl, - 26 dimethylaminocarbonyl, diethylaminocarbonyl, acetylamino, propionylamino, n- or i-butyroylamino, methoxycarbonylamino, ethoxycarbonylamino, n- or i propoxycarbonylamino, methylaminocarbonylamino, ethylaminocarbonyl amino, n- or i-propylaminocarbonylamino, methylsulphonylamino, ethyl 5 sulphonylamino, n- or i-propylsulphonylamino.

4. Compounds according to any of Claims 1 to 3, characterized in that RI represents hydrogen and represents in each case optionally cyano-, fluorine-, 10 chlorine-, methoxy-, ethoxy-, n- or i-propoxy-, methylthio-, ethylthio-, methylsulphinyl-, ethylsulphinyl-, methylsulphonyl-, ethylsulphonyl substituted methyl, ethyl, n- or i-propyl, and R 2 represents benzo-fused cycloalk(en)yl from the list below 15 where all cyclic groupings may be substituted by one of the groupings listed below: 20 nitro, hydroxyl, amino, cyano, carbamoyl, thiocarbamoyl, formylamino, fluorine, chlorine, bromine, methyl, ethyl, n- or i-propyl, n-, i-, s- or t-butyl, difluoromethyl, dichloromethyl, trifluoromethyl, trichloromethyl, chloro difluoromethyl, fluorodichloromethyl, methoxy, ethoxy, n- or i-propoxy, difluoromethoxy, trifluoromethoxy, chlorodifluoromethoxy, fluorodichloro 25 methoxy, methylthio, ethylthio, n- or i-propylthio, difluoromethylthio, trifluoromethylthio, chlorodifluoromethylthio, fluorodichloromethylthio, methylsulphinyl, ethylsulphinyl, trifluoromethylsulphinyl, methylsulphonyl, ethylsulphonyl, trifluoromethylsulphonyl, methylamino, ethylamino, n- or i propylamino, dimethylamino, diethylamino, acetyl, propionyl, n- or i 30 butyroyl, methoxycarbonyl, ethoxycarbonyl, n- or i-propoxycarbonyl, -27 methylaminocarbonyl, ethylaminocarbonyl, n- or i-propylaminocarbonyl, dimethylaminocarbonyl, diethylaminocarbonyl, acetylamino, propionylamino, n- or i-butyroylamino, methoxycarbonylamino, ethoxycarbonylamino, n- or i propoxycarbonylamino, methylaminocarbonylamino, ethylaminocarbonyl 5 amino, n- or i-propylaminocarbonylamino, methylsulphonylamino, ethyl sulphonylamino, n- or i-propylsulphonylamino.

5. Compounds according to any of Claims 1 to 4, characterized in that 10 R represents hydrogen , methyl, ethyl or n- or i-propyl, and R 2 represents one of the groupings below. NH 2 OH CH3 15

6. Process for preparing compounds according to any of Claims 1 to 5, characterized in that N-cyano-imidates of the general formula (II) R' R O N..CN(II) NCN 20 in which RI is as defined in any of Claims 1 to 5 and R' represents alkyl, -28 are reacted with amino compounds of the general formula (III) R(2 H H 5 in which R2 is as defined in any of Claims 1 to 5, if appropriate in the presence of a reaction auxiliary and if appropriate in the presence 10 of a diluent.

7. Herbicidal compositions, characterized in that they comprise at least one compound according to any of Claims 1 to 5 and customary extenders. 15

8. Use of at least one compound according to any of Claims 1 to 5 for controlling undesirable plants.