PROCESSOS PARA A PRODUCAO DE 1-(ALCOXI INFERIOR)-1-(ALQUIL INFERIOR)-3-4-(2-ALCOXI INFERIOR-2,3-DI-HIDRO-7-BENZOPIRANILOXI)FENIL-UREIAS,DE 1-HIDROXI-3-4(2-ALCOXI INFERIOR-2,3-DI-HIDRO-7-BENZOPIRANILOXI)FENIL-UREIAS E DE ISOCIANATO DE 4-(2-ALQUIL INFERIOR-2,3-DI-HIDRO-7-BENZOPIRANILOXI)FENILA,E COMPOSTOS

摘要

A 1-lower alkoxy-1-lower alkyl-3-[4-(2-lower alkoxy-2,3-dihydro-7-benzopyranyloxy)phenyl]-urea is prepared by a process which comprises alkylating a novel 1-hydroxy-3-[4-(2-lower alkoxy-2,3-dihydro-7-benzopyranyloxy)phenyl]urea with a corresponding alkylating agent selected from the group consisting of a sulfuric acid ester and an alkyl halide in the presence of a basic compound. The 1-lower alkoxy-1-lower alkyl-3-[4-(2-lower alkoxy-2,3-dihydro-7-benzopyranyloxy)phenyl]urea has a herbicidal activity. New intermediates and processes for production thereof are also disclosed.