Method for production of bis(hydroxy-aromatic)compounds
    6.
    发明授权
    Method for production of bis(hydroxy-aromatic)compounds 失效
    双(羟基 - 芳族)化合物的制备方法

    公开(公告)号:US06833482B1

    公开(公告)日:2004-12-21

    申请号:US10681492

    申请日:2003-10-07

    IPC分类号: C07L3912

    CPC分类号: C07C39/15 C07C37/18

    摘要: Disclosed is a method for preparing a bis(hydroxy-aromatic) compound which comprises the steps of: contacting at least one halo-substituted hydroxy-aromatic compound in a solvent mixture comprising water and at least one organic solvent in the presence of at least one base, at least one catalyst comprising palladium and hydrogen gas at a pressure in a range of between atmospheric pressure and 350 Kilopascals.

    摘要翻译: 公开了一种制备双(羟基 - 芳族)化合物的方法,其包括以下步骤:使至少一种卤素取代的羟基 - 芳族化合物在包含水和至少一种有机溶剂的溶剂混合物中,在至少一种 碱,至少一种催化剂,其包含在大气压和350千帕斯卡之间范围内的压力下的钯和氢气。

    Method for preparing hydroquinones and dihydroxybiphenyl compounds from mixtures of bromophenols and benzoquinones
    7.
    发明授权
    Method for preparing hydroquinones and dihydroxybiphenyl compounds from mixtures of bromophenols and benzoquinones 有权
    从溴酚和苯醌的混合物制备氢醌和二羟基联苯化合物的方法

    公开(公告)号:US06815565B2

    公开(公告)日:2004-11-09

    申请号:US10704002

    申请日:2003-11-07

    IPC分类号: C07C3924

    摘要: A method is described for the simultaneous preparation of p-bromophenols and p-benzoquinones, intermediates useful in the preparation of hydroquinones and 4,4′-dihydroxybiphenyls, respectively. Hydroquinones and 4,4′-dihydroxybiphenyls are useful monomers for the preparation of a variety of polymers. The method also comprises reducing the p-benzoquinone to its corresponding hydroquinone in the presence of the p-bromophenol. Limiting the amount of HBr present in the reaction mixture was shown to control the amount of benzoquinone produced. The method also allows for the recycling of many of the reagents used, thereby reducing the cost of producing each monomer.

    摘要翻译: 描述了同时制备对溴苯酚和对苯醌的方法,分别用于制备氢醌和4,4'-二羟基联苯的中间体。 氢醌和4,4'-二羟基联苯是用于制备各种聚合物的有用单体。 该方法还包括在对溴苯酚的存在下将对苯醌还原成其对应的氢醌。 显示出限制反应混合物中存在的HBr的量来控制所产生的苯醌的量。 该方法还允许循环使用许多试剂,从而降低生产每种单体的成本。

    Bromination of hydroxyaromatic compounds
    9.
    发明授权
    Bromination of hydroxyaromatic compounds 有权
    溴化羟基芳族化合物

    公开(公告)号:US07053251B2

    公开(公告)日:2006-05-30

    申请号:US10650566

    申请日:2003-08-28

    IPC分类号: C07L39/24

    CPC分类号: C07B39/00 C07C37/62 C07C39/27

    摘要: A method for brominating hydroxyaromatic compounds to form products, such as p-bromophenol, is disclosed. The method uses elemental bromine as the brominating agent and comprises contacting a hydroxyaromatic compound with bromine and oxygen in the presence of metal catalyst. Suitable catalysts include elemental copper, copper compounds, and compounds of Group IV–VIII transition metals.

    摘要翻译: 公开了用于溴化羟基芳族化合物以形成产物的方法,例如对溴苯酚。 该方法使用元素溴作为溴化剂,并且包括在金属催化剂存在下使羟基芳族化合物与溴和氧接触。 合适的催化剂包括元素铜,铜化合物和IV-VIII族过渡金属的化合物。