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    • 22. 发明授权
    • Liquid crystal compositions
    • 液晶组成
    • US5609790A
    • 1997-03-11
    • US457741
    • 1995-06-01
    • Takashi TanakaYuzuru SatoHiroshi IwaneShiro Inui
    • Takashi TanakaYuzuru SatoHiroshi IwaneShiro Inui
    • C09K19/02C09K19/46C09K19/34C09K19/12C09K19/52
    • C09K19/0266C09K19/46
    • A liquid crystal composition which shows an antiferroelectric smectic phase in a wide temperature range including room temperatures, and allows high speed operation at a low voltage. A liquid crystal composition comprising at least one kind of compound expressed as ##STR1## shows an antiferroelectric smectic liquid crystalline phase at room temperatures. In the above-mentioned formula, both R.sub.1 and R.sub.2 are alkyl groups, X.sub.1 is a bonding group, X.sub.2 and X.sub.3 are independently selected bonding groups, k, m and n are independently selected from 0 or the integer 1, Z is CF.sub.3 or CH.sub.3, A.sub.1 and A.sub.2 are groups independently selected from a six-membered ring optionally replaced with 0 to 2 nitrogen atoms, or a group in which 2 to 3 such six-membered rings of the same kind or different kinds are linked at the para positions directly or via one or more bonding groups, wherein one or more hydrogen atoms in one or more such rings is optionally replaced with either fluorine atom, methyl group or ethyl group.
    • 一种液晶组合物,其在包括室温的宽温度范围内显示出反铁电近晶相,并允许在低电压下高速运行。 包含至少一种表示为“IMAGE”的化合物的液晶组合物在室温下显示出反铁电的近晶液晶相。 在上述式中,R 1和R 2均为烷基,X 1为键合基团,X 2和X 3独立地选自键合基团,k,m和n独立地选自0或整数1,Z为CF 3或CH 3 ,A1和A2是独立地选自任选被0至2个氮原子替代的六元环的基团,或者其中2至3个相同种类或不同类型的六元环直接在对位连接的基团 或经由一个或多个键合基团,其中一个或多个这样的环中的一个或多个氢原子任选被氟原子,甲基或乙基基团取代。
    • 25. 发明授权
    • Method of producing aromatic carbonate
    • 芳香族碳酸酯的制造方法
    • US5543547A
    • 1996-08-06
    • US384258
    • 1995-02-03
    • Hiroshi IwaneHidekazu MiyagiSatoshi ImadaShoichi SeoTakahiro Yoneyama
    • Hiroshi IwaneHidekazu MiyagiSatoshi ImadaShoichi SeoTakahiro Yoneyama
    • C07C68/00C07C69/96
    • C07C68/005
    • The present invention relates to a method of producing an aromatic carbonate by reacting an aromatic hydroxy compound, carbon monoxide and oxygen using as a catalyst a specified catalyst system containing palladium and cerium compounds. Specifically, the present invention relates to a method of producing an aromatic carbonate by reacting an aromatic hydroxy compound, carbon monoxide and oxygen in the presence of a catalyst containing the following compounds:(A) at least one selected from palladium and palladium compounds;(B) at least one of trivalent or tetravalent cerium compounds;(C) at least one selected from quaternary ammonium salts and quaternary phosphonium salts;(D) at least one selected from quinones and reduction products thereof, i.e., aromatic diols; or(A) and (B) components of the above; and(E) at least one inorganic halide selected from alkali metal halides and alkali earth metal halides.
    • 本发明涉及通过使用含有钯和铈化合物的规定催化剂体系的催化剂使芳香族羟基化合物,一氧化碳和氧气反应来制造芳香族碳酸酯的方法。 具体地说,本发明涉及在含有以下化合物的催化剂存在下使芳族羟基化合物,一氧化碳和氧气反应制备芳香族碳酸酯的方法:(A)选自钯和钯化合物中的至少一种; (B)三价或四价铈化合物中的至少一种; (C)选自季铵盐和季鏻盐中的至少一种; (D)选自醌及其还原产物中的至少一种,即芳族二醇; 或(A)和(B)组分; 和(E)至少一种选自碱金属卤化物和碱土金属卤化物的无机卤化物。