The invention comprises compounds of the formula <;FORM:0781413/IV (a)/1>; where R is alkyl, X is O or NH, Y is O or S, and Ar is aryl, which may have one or more alkyl, alkoxy, hydroxyalkyl, nitro or halogen substituents; the alkyl and alkoxy groups have not more than 4 carbon atoms. The compounds are prepared (1) by the action of H-Y-Ar on the appropriate pyrones or pyridones having a -CH2Z substituent where Z is a reactive ester group such as halide, sulphuric or sulphonic ester, preferably in a solvent at 50-100 DEG C. in the presence of a basic condensing agent, or (2) by the alkylation of the corresponding 5-hydroxy compounds. In addition the pyridones may be made from the pyrones by heating with ammonia. Examples show the preparation by method (1) of 2-aryloxymethyl-5 - methoxy - 4 - pyrones where aryl group is phenyl, b -naphthyl, and the following substituted phenyl groups:-chloro (3 isomers), 2:4-dichloro, 2:4:6-trichloro, pentachloro, methyl (3 isomers), dimethyl (6 isomers), 2:4:6-trimethyl, 2-methyl-4- and -6-chloro, 3-methyl-4-chloro, 4-methyl-2-chloro, 2-methyl-4:6-dichloro, 4 - methyl - 2:6 - dichloro, 2:4 - dimethyl-6-chloro, 3:5-dimethyl-4-chloro, 4-isopropyl, 4-cyclohexyl, 2- and 4-nitro, 2-methylol, 2:4 - dichloro - 6 - methylol, 2 - chloro - 4:6 - dimethylol, 4 - chloro - 2:6 - dimethylol, 4 - methyl - 2 - methylol, 4 - methyl - 2:6 - dimethylol, 2:5 - dimethyl - 4 - methylol, 3:4 - dimethyl - 6 - methylol, 3 - methoxy, and 2 - methoxy-4-, -5- and -6-methyl; also 2-(21-methylolphenoxymethyl) - 5 - ethoxy - 4 - pyrone and 2-(41-chlorophenylthiomethyl) - 5 - methoxy-4-pyrone. I further examples 2-(41 chlorophenoxymethyl) - 5 - methoxy - 4 - pyridone (hydrochloride described) and 2-(21-methyl - 61 - chlorophenoxymethyl) - 5 - methoxy-4-pyridone are made from the corresponding pyrones and ammonia. It is also stated that Ar may also be ethylphenyl, ethoxyphenyl or hydroxy-ethyl-phenyl.ALSO:Compositions for use as plant growth regulants contain as active ingredient a compound of the formula: <;FORM:0781413/I/1>; where R is alkyl, X is O or NH, Y is O or S and Ar is aryl which may have one or more alkyl, alkoxy, hydroxyalkyl, nitro or halogen substituents; the alkyl and alkoxy groups have not more than 4 carbon atoms. The compositions may be in the form of powders, sprays, aerosols, emulsions or solutions in organic or aqueous organic solvents. There may also be present wetting agents, synergists and other plant growth regulants. In an example 2-(21 : 41-dichlorophenoxymethyl)-5-methoxy-4-pyrone is dissolved in dimethylformamide and diluted with water to give a solution which enhances root formation when plant stems are soaked with it. Many other suitable compounds are mentioned.ALSO:Compositions for use as systemic fungicides or herbicides contain as essential ingredient a compound of the formula <;FORM:0781413/VI/1>; where R is alkyl, X is O or NH, Y is O or S and Ar is aryl which may have one or more alkyl, alkoxy, hydroxyalkyl, nitro or halogen substituents; the alkyl and alkoxy groups have not more than 4 carbon atoms. The compositions may be in the form of powders, sprays, aerosols, emulsions or solutions in organic or aqueous organic solvents. There may also be present wetting agents, synergists, and other plant-growth regulants or fungicides. In examples, fungicides are made of (1) 2-(21-methyl - 41 - chlorophenoxymethyl) - 5 - methoxy-4-pyrone dispersed in water with the aid of a wetting agent; and (2) 2-(31:51-dimethylphenoxy - methyl) - 5 - methoxy - 4 - pyrone and talc similarly dispersed; herbicides are made from (3) 2-(2-(21:41-dichlorophenoxymethyl) - 5 - methoxy - 4 - pyrone; and (4) 2-(41 - chlorophenoxymethyl) - 5 - methoxy - 4-pyrone, in each case dissolved in toluene and acetone and dispersed in water with the aid of a wetting agent. Many other suitable compounds are mentioned.;FORM:0781413/VI/1>;FORM:0781413/I/1>;FORM:0781413/IV>
该发明包括以下公式的化合物:其中R为烷基,X为O或NH,Y为O或S,Ar为芳基,可能具有一个或多个烷基、烷氧基、羟基烷基、硝基或卤素取代基;烷基和烷氧基基团的碳原子数不超过4。这些化合物通过以下方法制备:(1)在适当的吡喃酮或吡啶酮上作用H-Y-Ar,其中吡喃酮或吡啶酮具有一个-CH2Z取代基,其中Z是反应性酯基,如卤化物、硫酸酯或磺酸酯,最好在50-100摄氏度的溶剂中,在碱性缩合剂的存在下进行,或者(2)通过对应的5-羟基化合物的烷基化制备。此外,吡啶酮可以通过与氨加热制备。示例表明,通过方法(1)制备了2-芳氧基甲基-5-甲氧基-4-吡喃,其中芳基为苯基、β-萘基,以及以下取代苯基:氯(3个异构体)、2,4-二氯、2,4,6-三氯、五氯、甲基(3个异构体)、二甲基(6个异构体)、2,4,6-三甲基、2-甲基-4-和-6-氯、3-甲基-4-氯、4-甲基-2-氯、2-甲基-4,6-二氯、4-甲基-2,6-二氯、2,4-二甲基-6-氯、3,5-二甲基-4-氯、4-异丙基、4-环己基、2-和4-硝基、2-甲基醇、2,4-二氯-6-甲基醇、2-氯-4,6-二甲基醇、4-氯-2,6-二甲基醇、4-甲基-2-甲基醇、4-甲基-2,6-二甲基醇、2,5-二甲基-4-甲基醇、3,4-二甲基-6-甲基醇、3-甲氧基、2-甲氧基-4-, -5-和-6-甲基;还有2-(21-甲基醇苯氧基甲基)-5-乙氧基-4-吡喃和2-(41-氯苯硫醚基甲基)-5-甲氧基-4-吡喃。另外还有一些其他化合物的例子。