Method for preparing N,N-disubstituted hydroxylamines
    1.
    发明授权
    Method for preparing N,N-disubstituted hydroxylamines 失效
    制备N,N-二取代羟胺的方法

    公开(公告)号:US6031130A

    公开(公告)日:2000-02-29

    申请号:US81943

    申请日:1998-05-21

    摘要: A method for preparing N,N-disubstituted hydroxylamine compounds represented by the formula (II): HO--N(R.sup.1)(R.sup.2) wherein R.sup.1 and R.sup.2 may be the same or different, and independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aromatic heterocyclic group, which comprises the step of adding a rhenium catalyst and aqueous hydrogen peroxide to a mixture containing a secondary amine compound represented by the formula (I): HN(R.sup.1)(R.sup.2) wherein R.sup.1 and R.sup.2 have the same meanings as those defined above and a dehydrating agent.

    摘要翻译: 制备由式(II)表示的N,N-二取代羟胺化合物的方法:HO-N(R1)(R2)其中R1和R2可以相同或不同,并且独立地表示取代或未取代的烷基, 取代或未取代的芳基或取代或未取代的芳族杂环基,其包括将铼催化剂和过氧化氢水溶液加入到由式(I)表示的仲胺化合物的混合物中:HN(R1)(R2 )其中R1和R2具有与上述相同的含义和脱水剂。

    Method of making hydroxy-substituted hydroxylamines and color developers
containing same
    2.
    发明授权
    Method of making hydroxy-substituted hydroxylamines and color developers containing same 失效
    制备羟基取代羟胺的方法和含有它们的显色剂

    公开(公告)号:US6028225A

    公开(公告)日:2000-02-22

    申请号:US153681

    申请日:1998-09-15

    申请人: Lynda W. McGarry

    发明人: Lynda W. McGarry

    CPC分类号: G03C7/413 C07C239/12

    摘要: Hydroxy-substituted hydroxylamine antioxidants can be prepared by reacting hydroxylamine or a mono-substituted hydroxylamine, in free base form, with an epoxide. The antioxidant reaction product can be used without isolation from the reaction solution, and combined with a color developing agent to provide a photographic color developing composition in either concentrated or working strength formulations. The method for preparing the antioxidant is rapid and efficient because of the use of the free base form of the hydroxylamine reactant, higher temperatures (at or above 50.degree. C.) and certain molar ratios of reactants.

    摘要翻译: 羟基取代的羟胺抗氧化剂可以通过游离碱形式的羟胺或单取代羟胺与环氧化物反应来制备。 抗氧化反应产物可以在不与反应溶液分离的情况下使用,并与彩色显影剂组合使用,以提供浓缩或加工强度制剂中的照相显色组合物。 制备抗氧化剂的方法是快速和有效的,因为使用游离碱形式的羟胺反应物,较高的温度(等于或高于50℃)和某些摩尔比的反应物。