申请人:UNIROYAL LIMITED
公开号:EP0044647A2
公开(公告)日:1982-01-27
Hydrogen chloride is passed into p-xylene and acetaldehyde to form bis-1-chloroethyl ether; the latter is converted to 2-(1-chloroethyl)-1,4-dimethylbenzene by the action of sulfuric acid and hydrogen chloride. Alkali metal hydrogen sulfide in aqueous methanol or ethanol converts the 2-(1-chloroethyl)-1,4-dimethylbenzene to alpha,2,5-trimethylbenzenemethanethiol; the sodium salt of the latter reacted with 2-chloropyridine-1-oxide yields 2-[1-(2,5-dimethylphenyl)ethylthio]pyridine-1-oxide which is then oxidized with hydrogen peroxide and alkali metal tungstate or tungstic acid to form 2-[1-(2,5-dimethylphenyl)ethylsulfonyl]pyridine-1-oxide. The latter is useful as a herbicide.
氯化氢进入对二甲苯和乙醛中生成双-1-氯乙基醚;后者在硫酸和氯化氢的作用下转化为 2-(1-氯乙基)-1,4-二甲基苯。碱金属硫化氢在甲醇或乙醇水溶液中可将 2-(1-氯乙基)-1,4-二甲基苯转化为 alpha,2,5-三甲基苯甲硫酚;后者的钠盐与 2-氯吡啶-1-氧化物反应生成 2-[1-(2,5-二甲基苯基)乙硫基]吡啶-1-氧化物,然后与过氧化氢和碱金属钨酸盐或钨酸氧化生成 2-[1-(2,5-二甲基苯基)乙磺酰基]吡啶-1-氧化物。后者可用作除草剂。