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Fukuoka Daisuke C O Mitsui Pet, Ishitoku Takeshi C O Mitsui Pe, Hashimoto Isao C O Mitsui Petr, Kihara Noriaki C O Mitsui Petr, Takesue Mitsuyuki C O Mitsui P: Process for the production of 1-lower alkoxy-1-lower alkyl-3-substituted phenylurea, and intermediate thereof and process for the production of the intermediate.. Mitsui Petrochemical, June 26, 1991: EP0434074-A2

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 ...