Process for the preparation of thioether-substituted aromatic ketones
    224.
    发明授权
    Process for the preparation of thioether-substituted aromatic ketones 失效
    制备硫醚取代的芳族酮的方法

    公开(公告)号:US6096929A

    公开(公告)日:2000-08-01

    申请号:US369300

    申请日:1999-08-06

    Applicant: Neil W. Boaz

    Inventor: Neil W. Boaz

    CPC classification number: C07C319/14 C07C201/12

    Abstract: The preparation of aromatic ketones substituted with a thioether group at the ortho position is accomplished by the initial reaction of an aromatic nucleus substituted with a halide and an ortho nitro group with a nitroalkane in the presence of a hydroxide base. The resulting ortho-nitroalkyl nitroarene compound is converted to the corresponding ortho-nitroaryl ketone by an oxidative Nef reaction. The aromatic nitro group of the ortho-nitroaryl ketone is replaced with a thioether group by reaction with a thiolate anion, most preferably under phase-transfer conditions. Aromatic ketones may be used to prepare various pharmaceutical and herbicidal compounds.

    Abstract translation: 在邻位置由硫醚基取代的芳族酮的制备通过在氢氧化物碱存在下,用卤化物和邻硝基取代的芳香核与硝基烷烃的初始反应来实现。 所得邻硝基烷基硝基芳烃化合物通过氧化Nef反应转化成相应的邻硝基芳基酮。 通过与硫醇盐阴离子反应,最优选在相转移条件下,邻硝基芳基酮的芳基硝基被硫醚基取代。 芳族酮可用于制备各种药物和除草化合物。

    Method for the preparation of 3,4-dihydroxy-5-nitrobenzaldehyde
    229.
    发明授权
    Method for the preparation of 3,4-dihydroxy-5-nitrobenzaldehyde 失效
    3,4-二羟基-5-硝基苯甲醛的制备方法

    公开(公告)号:US5710343A

    公开(公告)日:1998-01-20

    申请号:US809405

    申请日:1997-05-08

    CPC classification number: C07C201/12 C07C201/16

    Abstract: The invention provides a method for the preparation of 3,4-dihydroxy-5-nitrobenzaldehyde by reacting 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde with a reagent comprising zinc chloride, water and hydrogen chloride.

    Abstract translation: PCT No.PCT / FI95 / 00513 Sec。 371日期:1997年5月8日 102(e)日期1997年5月8日PCT提交1995年9月20日PCT公布。 出版物WO96 / 09274 日期:1996年3月28日本发明提供通过使3-乙氧基-4-羟基-5-硝基苯甲醛与包含氯化锌,水和氯化氢的试剂反应来制备3,4-二羟基-5-硝基苯甲醛的方法。

    Process for the preparation of 2-nitrobenzaldehydes
    230.
    发明授权
    Process for the preparation of 2-nitrobenzaldehydes 失效
    2-硝基苯甲醛的制备方法

    公开(公告)号:US5576463A

    公开(公告)日:1996-11-19

    申请号:US398228

    申请日:1995-03-03

    CPC classification number: C07C201/12

    Abstract: The new process for the preparation of 2-nitrobenzaldehydes of the general formula ##STR1## in which X.sub.1 and X.sub.2 either independently of one another represent hydrogen or halogen or one of the substituents represents nitro and the other substituent then represents hydrogen,by oxidation of 2-nitrotoluenes of the general formula ##STR2## in which X.sub.1 and X.sub.2 have the meaning indicated above is characterized in that the oxidation with oxygen or an oxygen-containing gas is carried out in the presence of at least one alkoxyalkylamine as a solvent and in the presence of strong bases.

    Abstract translation: 制备通式(I)的2-硝基苯甲醛的新方法,其中X 1和X 2彼此独立地表示氢或卤素或一个取代基表示硝基,而另一个取代基则代表氢,由 其中X1和X2具有上述含义的通式为“IMAGE”(II)的2-硝基甲苯的氧化特征在于用氧或含氧气体进行氧化在至少一种烷氧基烷基胺 作为溶剂,并存在强碱。

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