申请人:Agro-Chemie Novenyvedoszer Gyarto Ertekesito est Forgalmazo Kft.
公开号:US06320085B1
公开(公告)日:2001-11-20
The subject matter of the invention is the process for the preparation of mixed ethers of formula I, wherein Ar represents an aromatic or one or more heteroatom-containing moiety, optionally substituted by one or more C1-4 alkoxy, methylenedioxy, C1-4 alkyl, halogen, C1-4 haloalkyl or nitro-group, and/or condensed with a benzene ring; R1 and R2 independently mean hydrogen, C1-4 alkyl, C1-4 haloalkyl, C2-4 alkenyl, phenyl, substituted phenyl, C3-6 cycloalkyl group, R3 means C3-6 alkynyl, optionally substituted by one or more C1-6 alkyl, C3-6 alkenyl, C3-6 alkynyl, C1-6 haloalkyl group, or halogen atom, R3 also means a C1-4 alkyloxy-C1-4 alkyloxy-C1-4 alkyl group. The process comprises the step of reacting the compounds of general formula II with 1 to 3 molar equivalent of the alcohol of general formula IlI in the presence of acid, a Lewis acid, a metal oxide or a metal carbonate, X means hydroxy, halogen or sulphonester leaving group, the resulting ether of general formula I is isolated, if desired, stabilized by the addition of a base and/or an antioxidant; and if desired the excess of the alcohol is recovered.
该发明的主题是制备式I的混合醚的过程,其中Ar代表芳香族或一个或多个含杂原子的基团,可以选择地被一个或多个C1-4烷氧基,亚甲二氧基,C1-4烷基,卤素,C1-4卤代烷基或硝基取代,并/或与苯环融合;R1和R2独立地表示氢,C1-4烷基,C1-4卤代烷基,C2-4烯基,苯基,取代苯基,C3-6环烷基,R3表示C3-6炔基,可以选择地被一个或多个C1-6烷基,C3-6烯基,C3-6炔基,C1-6卤代烷基或卤素原子取代,R3还表示C1-4烷氧基-C1-4烷氧基-C1-4烷基基团。该过程包括将通用式II化合物与通用式III醇1至3摩尔当量在酸、路易斯酸、金属氧化物或金属碳酸盐存在下反应,X表示羟基、卤素或磺酯基离去基团,所得的通用式I醚被分离,如有需要,通过添加碱和/或抗氧化剂稳定;如有需要,回收剩余的醇。