Fluorinated fluorene derivatives
    82.
    发明授权
    Fluorinated fluorene derivatives 有权
    氟化芴衍生物

    公开(公告)号:US07087272B2

    公开(公告)日:2006-08-08

    申请号:US10473332

    申请日:2002-03-07

    摘要: The invention relates to fluorinated fluorene derivatives of negative DC anisotropy, of the formula I R1—(—A1—Z1—)k1—(—A2—Z2—)k2—W—(—Z3—A3—)k3—(—Z4—A4—)k4—R2I in which W denotes the sub-formula L1 and L2, independently of one another, are H, F, Cl, —CH2F, —CHF2 or —CF3, with the proviso that L1 and L2 are not both H, L3 and L4, independently of one another, are H or F, and R1, R2, A1, A2, A3, A4, Z1, Z2, Z3, Z4, k1, k2, k3 and k4 are as defined above. The invention furthermore relates to liquid-crystalline media and to optical and electro-optical display elements.

    摘要翻译: 本发明涉及负直流各向异性的氟化芴衍生物,式I <βin-line-formula description =“In-line Formulas”end =“lead”?> R 1 - ( - - - - - - - - - - - - - - - - - - ( - 2 - - - - - - - - - - - - - - - - - - - - - - ( - Z - SUP> 4 4 其中W表示子公式L 1和L 2彼此独立的“公式”end =“tail”?>是H,F,Cl, -CH 2 2 F,-CHF 2或-CF 3 3,条件是L 1和L 2, SUP> 2 不是H,L 3和L 4都彼此独立地是H或F,R 1, SUP>,R 2 2,A 1,A 2,A 3,A 4, Z 1,Z 1,Z 2,Z 3,Z 4,K 1,K 2,K 3和K 4 如上所述。 本发明还涉及液晶介质和光学和电光显示元件。

    Method for the nuclear chlorination of ortho-xylene
    83.
    发明授权
    Method for the nuclear chlorination of ortho-xylene 有权
    邻二甲苯核氯化方法

    公开(公告)号:US06930216B2

    公开(公告)日:2005-08-16

    申请号:US10659590

    申请日:2003-09-10

    CPC分类号: C07C17/12 C07C25/125

    摘要: A method for the nuclear chlorination of ortho-xylene using a chlorinating agent in the presence of at least one Friedel-Crafts catalyst and chloro-substituted 2,8-dimethylphenoxathiin as co-catalyst. The co-catalyst used is preferably tetrachlorinated 2,8-dimethylphenoxathiin, in particular 1,3,7,9-tetrachloro-2,8-dimethylphenoxathiin of the formula

    摘要翻译: 在至少一种Friedel-Crafts催化剂和氯取代的2,8-二甲基苯氧硫蛋白作为助催化剂的存在下,使用氯化剂对邻二甲苯进行核氯化的方法。 所用的助催化剂优选为四氯化的2,8-二甲基苯氧硫蛋白,特别是1,3,7,9-四氯-2,8-二甲基苯氧硫蛋白

    Method for the preparation of iodonium salts
    87.
    发明授权
    Method for the preparation of iodonium salts 失效
    碘鎓盐的制备方法

    公开(公告)号:US5426222A

    公开(公告)日:1995-06-20

    申请号:US292149

    申请日:1994-08-17

    CPC分类号: C07C303/32 C07C17/12

    摘要: The present invention relates to an improved method for the preparation of iodonium salts. More specifically, the present invention relates to an improved method for the production of symmetric or asymmetric diaryliodonium triflate (trifluoromethane sulfonate) salts. The diaryliodonium salts of the present invention are useful as photoacid catalysts for use in acid-sensitive polymerization and in curing systems such as radiation curable release coating compositions.

    摘要翻译: 本发明涉及一种制备碘鎓盐的改进方法。 更具体地说,本发明涉及制备对称或不对称二芳基碘鎓三氟甲磺酸盐(三氟甲烷磺酸盐)盐的改进方法。 本发明的二芳基碘盐可用作用于酸敏感聚合的光酸催化剂,以及用于固化体系如辐射固化脱模涂料组合物。

    Process for producing a halobenzene
    90.
    发明授权
    Process for producing a halobenzene 失效
    卤代苯的制备方法

    公开(公告)号:US4831199A

    公开(公告)日:1989-05-16

    申请号:US57650

    申请日:1987-06-09

    IPC分类号: C07C25/00 C07C17/12 C07C41/22

    CPC分类号: C07C41/22 C07C17/12

    摘要: A process for producing a halobenzene represented by the formula: ##STR1## where R is a lower alkyl group, a lower alkoxy group or a halogen atom, and X is a halogen atom, which comprises halogenating a benzene represented by the formula: ##STR2## where R is as defined above, in a liquid phase in the presence of a catalyst, characterized in that the catalyst is a combination of an aliphatic carboxylic acid component and a zeolite having a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of from 3 to 8 and a pore size of from 6 to 10 .ANG..

    摘要翻译: 一种制备由下式表示的卤代苯的方法:其中R是低级烷基,低级烷氧基或卤原子,X是卤素原子,其中包括将由式 :其中R如上定义,在催化剂存在下的液相中,其特征在于催化剂是脂族羧酸组分和SiO 2 / Al 2 O 3摩尔比为1:1的沸石的组合 3至8,孔径为6至10安培。