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    Process for preparing .alpha.-chloro-.alpha.-oximino-4-hydroxyacetophenone
    3.
    发明授权
    Process for preparing .alpha.-chloro-.alpha.-oximino-4-hydroxyacetophenone 失效
    制备α-氯-α-肟基-4-羟基苯乙酮的方法

    公开(公告)号：US5292945A

    公开(公告)日：1994-03-08

    申请号：US17550

    申请日：1993-02-16

    申请人： John R. Durrwachter ,  Charlet R. Lindley ,  Graham N. Mott

    发明人： John R. Durrwachter ,  Charlet R. Lindley ,  Graham N. Mott

    IPC分类号： C07C259/02 ,  C07C53/00

    CPC分类号： C07C259/02

    摘要： A process for the preparation of .alpha.-chloro-.alpha.-oximino-4-hydroxyacetophenone by reacting nitrosyl chloride with a mixture of 4-hydroxyacetophenone and a strong acid catalyst such as hydrogen chloride is disclosed. The nitrosyl chloride is introduced as a gas into the reactor to contact 4-hydroxyacetophenone and said acid catalyst dissolved in a solvent therein.

    摘要翻译： 公开了通过使亚硝酰氯与4-羟基苯乙酮和强酸催化剂如氯化氢的混合物反应来制备α-氯-α-肟基-4-羟基苯乙酮的方法。 将亚硝酰氯作为气体引入反应器中以接触溶于其中的溶剂中的4-羟基苯乙酮和所述酸催化剂。

    BF3 catalyzed acylation of aromatic compounds
    4.
    发明授权
    BF3 catalyzed acylation of aromatic compounds 失效
    BF3催化芳构化合物

    公开(公告)号：US5118860A

    公开(公告)日：1992-06-02

    申请号：US619157

    申请日：1990-11-27

    申请人： Charlet R. Lindley

    发明人： Charlet R. Lindley

    IPC分类号： B01J27/12 ,  C07B41/06 ,  C07B61/00 ,  C07C45/46 ,  C07C49/76 ,  C07C317/24 ,  C07C323/22

    CPC分类号： C07C45/46

    摘要： In accordance with the present invention, aromatic ketones are prepared by the acylation of aromatic reactants using boron trifluoride as a catalyst and in a solvent medium comprising anhydrous liquid sulfur dioxide. The acylation proceeds in accordance with the equation I: ##STR1## wherein n ranges from 5 to 9, Ar is phenylene and n is 5, naphthalene and n is 7, or a bis phenylene radical having the structure: ##STR2## and n is 9; wherein Z is selected from the group consisting of a covalent carbon to carbon bond, O, S, SO.sub.2, C.dbd.O and C.sub.1 to C.sub.3 alkylene or alkylidene, X is selected from the group consisting of H, OH, halogen, C.sub.1 to C.sub.6 alkyl C.sub.1 to C.sub.6 alkoxy and combinations thereof, R is an alkyl group containing from 1 to about 16 carbon atoms and Y is selected from the group consisting of hydroxy, acyloxy and halogen.The acylation process of this invention gives rise to aromatic ketones which are highly selectively acylated at the activated ring carbon and also yields a high ratio of conversion of the aromatic starting material.The process also provides a faster rate of reaction than analogous processes and affords the opportunity to recover large quantities of the BF.sub.3 catalyst as well as the SO.sub.2 solvent for recycle, thus offering improved economy and efficiencies.