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27 条记录 (耗时 0.023 秒)

    Preparation of 4-phenyl-1,2,3,6-tetrahydropyridines
    2.
    发明授权
    Preparation of 4-phenyl-1,2,3,6-tetrahydropyridines 有权
    4-苯基-1,2,3,6-四氢吡啶的制备

    公开(公告)号：US6136981A

    公开(公告)日：2000-10-24

    申请号：US334776

    申请日：1999-06-16

    申请人： Francis Brion ,  Christian Richard

    发明人： Francis Brion ,  Christian Richard

    IPC分类号： C07B57/00 ,  C07D211/42 ,  C07D211/70 ,  C07D491/044 ,  C07D493/04 ,  C07D211/74

    CPC分类号： C07D493/04 ,  C07D211/42 ,  C07D211/70

    摘要： A process for the preparation of a compound of the formula ##STR1## wherein R.sub.1 is selected from the group consisting of hydrogen and alkyl of 1 to 8 carbon atoms, R.sub.2 and R.sub.4 are alkyl of 1 to 4 carbon atoms and R.sub.3 is alkyl of 1 to 8 carbon atoms comprising reacting a compound of the formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are defined as above or an amine salt thereof with an electrophilic halogenating agent to obtain a compound of the formula ##STR3## wherein Hal.sub.1 is halogen, reacting the latter with a halohydroxylating agent to obtain a compound of the formula ##STR4## wherein Hal.sub.2 is halogen, reacting the latter with a base to obtain a compound of the formula ##STR5## reacting the latter with a diastereoselective reducing agent to obtain a compound of the formula ##STR6## reacting the latter with a reducing agent to obtain a cis racemic compound of formula I and optionally resolving the latter with a resolution agent to obtain the desired optical form and novel intermediates.

    摘要翻译： 一种制备下式化合物的方法，其中R 1选自氢和1至8个碳原子的烷基，R 2和R 4是1至4个碳原子的烷基，R 3是1至8个碳原子的烷基 包括使下式化合物其中R 1，R 2，R 3和R 4如上定义，或其胺盐与亲电卤化剂反应，得到下式化合物其中Hal1为卤素，使其与卤代羟基化试剂反应，得到 得到下式的化合物，其中Hal 2是卤素，使其与碱反应，得到下式的化合物，使其与非对映选择性还原剂反应，得到下式的化合物，使后者与还原剂反应，得到顺式 式I的外消旋化合物，并任选用分解剂拆分后者，得到所需的光学形式和新的中间体。

    Method for producing a sheet of paper comprising calcite
    6.
    发明授权
    Method for producing a sheet of paper comprising calcite 失效
    用于生产包含方解石的纸的方法

    公开(公告)号：US07504000B2

    公开(公告)日：2009-03-17

    申请号：US10467461

    申请日：2002-02-14

    申请人： Christian Richard

    发明人： Christian Richard

    IPC分类号： D21H17/63 ,  D21H23/02 ,  C01F11/18

    CPC分类号： D21H17/70 ,  D21H17/675

    摘要： The invention relates to a method for producing a sheet of paper (6) comprising paper fibres and calcium carbonate mainly in the form of calcite crystals linked directly to the paper fibres. The inventive method is characterised in that it comprises the following steps:—(i) an aqueous composition comprising calcium bicarbonates (5) and/or hydrated and/or dissolved carbon dioxide (3) and (ii) an aqueous composition comprising calcium hydroxide (4) are mixed in an aqueous medium in such a way as to precipitate the calcium carbonate in the form of vaterite crystals;—paper fibres (2, 2′) are immediately added;—the vaterite crystals are left to transform into calcite crystals on contact with the fibres;—said mixture containing the calcite crystals which are fixed to the fibres is subsequently sent on the conveying wire of the papermaking machine (M) for drainage and so that the sheet of paper can be formed;—the sheet of paper (6) thus obtained is treated, if necessary, and dried.

    摘要翻译： 本发明涉及一种用于生产纸张（6）的方法，所述纸（6）包括主要以直接连接到纸纤维的方解石晶体形式的纸纤维和碳酸钙。 本发明的方法的特征在于其包括以下步骤： - （i）包含碳酸氢钙（5）和/或水合和/或溶解的二氧化碳（3）的水性组合物和（ii）包含氢氧化钙 4）在水性介质中以使球状晶体形式的碳酸钙沉淀的方式混合; - 立即加入纸纤维（2,2'）;将球霰石晶体转变成方解石晶体， 与纤维接触;含有固定在纤维上的方解石晶体的混合物随后送到造纸机（M）的输送线上排出，从而可以形成纸张; - 纸张 （6）如果需要，进行处理并干燥。

    Process for the adaptative coding and the decoding of a television picture and devices for performing this process
    8.
    发明授权
    Process for the adaptative coding and the decoding of a television picture and devices for performing this process 失效
    用于电视图像的适应编码和解码以及用于执行该处理的装置的处理

    公开(公告)号：US4567519A

    公开(公告)日：1986-01-28

    申请号：US591479

    申请日：1984-03-20

    申请人： Christian Richard

    发明人： Christian Richard

    IPC分类号： H04N7/32 ,  H04N7/34 ,  H04N7/12

    CPC分类号： H04N19/593

    摘要： This coding process makes it possible to reduce the information quantity of a television picture. A coding device comprises: a device for detecting the high brightness gradient points; a device detecting, from among the blocks formed from among four consecutive picture points so-called high gradients blocks containing at least one high gradient point; a device for coding points of the high gradient blocks, which carries out a differential coding of the brightness values and a quantification in accordance with a first non-linear scale; a device for coding points of low gradient blocks, which carries out a differential coding and a quantification in accordance with a second non-linear scale, the coding only being carried out for alternate points of the low gradient blocks, a device for decoding points of the high gradient blocks, and a device for decoding points of the low gradient blocks, the brightness values of the uncoded points of the low gradient blocks being reconstituted by linear interpolation on the basis of the decoded brightness values of adjacent points.

    摘要翻译： 该编码处理使得可以减少电视图像的信息量。 编码装置包括：用于检测高亮度梯度点的装置; 在从包含至少一个高梯度点的所谓高梯度块的四个连续图像点中形成的块之间进行检测; 用于编码高梯度块的点的装置，其执行亮度值的差分编码和根据第一非线性标度的量化; 用于对低梯度块的点进行编码的装置，其执行根据第二非线性标度的差分编码和量化，仅对低梯度块的交替点执行编码，用于解码 高梯度块和用于解码低梯度块的点的装置，通过基于相邻点的解码亮度值的线性内插来重建低梯度块的未编码点的亮度值。