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    Thio carbamates and their derivatives
    11.
    发明授权
    Thio carbamates and their derivatives 失效
    THIO碳水化合物及其衍生物

    公开(公告)号：US5151540A

    公开(公告)日：1992-09-29

    申请号：US935461

    申请日：1986-11-26

    Applicant: Mohammad Aslam ,  Kenneth G. Davenport

    Inventor： Mohammad Aslam ,  Kenneth G. Davenport

    IPC: B01J27/06 ,  B01J27/00 ,  C07C67/00 ,  C07C313/00 ,  C07C319/02 ,  C07C323/34 ,  C07C325/00 ,  C07C333/02 ,  C07C333/04

    CPC classification number: C07C333/02

    Abstract: A method is provided for preparing N-acylaminothiophenols, e.g., N-acetyl-para-aminothiophenol, or aminothiophenols, e.g., para-aminothiophenol, or N,S-diacylaminothiophenols, e.g., N,S-diacetyl-para-aminothiophenol, by reacting any of certain sulfur-containing ketones, viz., an S-(acylaryl) N,N-di(organo)thiocarbamate, e.g., S-(4'-acetophenyl)-N,N-dimethylthiocarbamate, an acylthiophenol acylate ester, e.g., 4-acetothiophenol acetate, or a free acylthiophenol, e.g., 4-acetothiophenol with hydroxylamine or a hydroxylamine salt, to form the oxime of the ketone, subjecting the oxime to a Beckmann rearrangement in the presence of a catalyst to form an S-(N-acyl-aminoaryl) N,N-di(organo)thiocarbamate, e.g., S-(N-acetyl-para-aminophenyl) N,N-dimethylthiocarbamate, an N,S-diacylaminothiophenol, e.g., N,S-diacetyl-paraaminothiophenol, or an N-acyl aminothiophenol, e.g., N-acetyl-para-aminothiophenol, respectively. The S-(N-acyl-aminoaryl) N,N-di(organo)thiocarbamate may be hydrolyzed to the N-acyl aminothiophenol or aminothiophenol. The S-(acylaryl) N,N-di(organo)thiocarbamate may be produced by reacting a hydroxy aromatic ketone, e.g., 4-hydroxyacetophenone (4-HAP) with an N,N-di(organo)thiocarbamoyl halide, e.g., N,N-dimethylthiocarbamoyl chloride (DMTC) to form an O-(acylaryl) N,N-di(organo)thiocarbamate, e.g., O-(4'-acetophenyl) N,N-dimethylthiocarbamate, and pyrolytically rearranging the latter compound. The acylthiophenol may be produced by hydrolyzing the S-(acylaryl) N,N-di(organo)thiocarbamate.

    Process for the preparation of bisarylalkyl ethers
    16.
    发明授权
    Process for the preparation of bisarylalkyl ethers 失效
    二芳基烷基醚的制备方法

    公开(公告)号：US5210278A

    公开(公告)日：1993-05-11

    申请号：US934995

    申请日：1992-08-25

    Applicant: Mohammad Aslam ,  Brad L. Smith ,  George Kvakovszky

    Inventor： Mohammad Aslam ,  Brad L. Smith ,  George Kvakovszky

    IPC: C07C67/297

    CPC classification number: C07C67/297

    Abstract: A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydiethylidene)bisphenol dimethyl ether. A process for preparing a bisarylalkyl ether by reacting a corresponding arylalkanol in the presence of an acid catalyst is also disclosed.

    Abstract translation: 公开了一种在酸催化剂存在下使双芳基烷基醚反应制备取代苯乙烯的方法。 该方法优选用于从4,4' - （氧基二亚乙基）双酚二乙酸酯和来自4,4'-（氧基二亚乙基）双酚二甲醚的4-甲氧基苯乙烯制备4-乙酰氧基苯乙烯。 还公开了通过在酸催化剂的存在下使相应的芳基烷醇反应来制备双芳基烷基醚的方法。

    Process for producing thioalkyl or thioarylphenones
    17.
    发明授权
    Process for producing thioalkyl or thioarylphenones 失效
    制备硫代烷基或硫代芳基化合物的方法

    公开(公告)号：US4994623A

    公开(公告)日：1991-02-19

    申请号：US500112

    申请日：1990-03-27

    Applicant: Kenneth G. Davenport ,  Wilson B. Ray ,  Mohammad Aslam

    Inventor： Kenneth G. Davenport ,  Wilson B. Ray ,  Mohammad Aslam

    IPC: C07C319/20 ,  C07C323/22

    CPC classification number: C07C319/20 ,  C07C323/22

    Abstract: Thiophenones are produced by acylating the aromatic ring of thiophenolic ethers in the presence of anhydrous hydrofluoric acid. It has been found that if the thio group is in the form of a thioether and not a thiol, the aromatic ring can be acylated to form the thiophenone in the presence of anhydrous hydrofluoric acid.

    Abstract translation: 通过在无水氢氟酸存在下酰化硫代酚醚的芳环来制备噻吩酮。 已经发现，如果硫基是硫醚而不是硫醇的形式，则芳族环可以在无水氢氟酸的存在下酰化形成噻吩酮。

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