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    • 6. 发明授权
    • Process for chroman carboxylates
    • 苯并二氢吡喃羧酸盐的工艺
    • US5780652A
    • 1998-07-14
    • US890251
    • 1997-07-09
    • Robert Eugene Hormann
    • Robert Eugene Hormann
    • C07C69/757C07D311/58C07D311/74
    • C07C69/757C07D311/58C07D311/74
    • This invention relates to an improved process for the preparation of 5-methylchroman-6-carboxylic acid, a useful intermediate in the preparation of chroman-containing diacylhydrazines which are useful as insecticides, by reacting a Hagemann's ester with a propargyl derivative in the presence of a base and a solvent to produce a propargyl ether, rearranging the propargyl ether by application of heat with a suitable catalyst being present, with or without a solvent, to produce a cyclic ether type compound and isomerizing the cyclic ether type compound with a catalyst in a suitable solvent to produce a chroman ester. The propargyl ethers and the cyclic ether type compounds produced by the process of the present invention are new.
    • 本发明涉及一种制备5-甲基苯并二氢吡喃-6-羧酸的改进方法,该5-甲基苯并二氢吡喃-6-羧酸是制备可用作杀虫剂的含色马酰二酰肼的有用中间体,可通过使Hagemann酯与炔丙基衍生物在 碱和溶剂以产生炔丙基醚,通过在存在或不含有溶剂的情况下用合适的催化剂进行加热来重排丙炔醚,以产生环醚型化合物并用催化剂异构化环醚型化合物 合适的溶剂以产生苯并二氢吡喃酯。 通过本发明方法制备的炔丙醚和环醚型化合物是新的。