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    • 121. 发明申请
    • NEW PROCESSES FOR THE PREPARATION OF 3-BROMOANISOLE AND 3-BROMONITROBENZENE
    • 制备三硼和三溴代苯并噻吩的新工艺
    • WO99051561A1
    • 1999-10-14
    • PCT/IL1999/000161
    • 1999-03-22
    • C07C41/01C07C43/225C07C201/12C07C205/12
    • C07C41/01C07C201/12C07C205/12C07C43/225
    • Process for the preparation of 3-bromoanisole comprising methoxydenitrating 3-bromonitrobenzene in the presence of a phase-transfer catalyst (PTC), and the preparation of 3-bromonitrobenzene by the bromination of nitrobenzene with bromine in oleum. The methoxydenitration reagent is an alkali metal methoxide, which is selected from sodium methoxide and potassium methoxide. The amount of methoxide used is 1-1.5 mol per mol of 3-bromonitrobenzene. The alkali methoxide can be a pre-prepared solid or it can be prepared in situ, by the reaction of the corresponding alkali hydroxide and methanol. In the case when pre-prepared solid methoxide is used, the effective amount of alkali hydroxide is between 1.2-1.7 mol per mol of 3-bromonitrobenzene. The reaction temperatures are between about 40 to 80 DEG C, with preference to reaction temperatures of 50 to 55 DEG C. In the case in which methoxide is prepared in situ, the effective amount of alkali hydroxide is between 2.2-2.4 mol per mol of 3-bromonitrobenzene. The reaction temperatures are between about 50 to 80 DEG C with preference to reaction temperatures of 55 to 65 DEG C.
    • 在相转移催化剂(PTC)的存在下,制备3-溴苯甲醚的方法,其中包括使3-溴硝基苯甲氧基过氧化,通过在发烟硫酸中用溴溴化硝基苯来制备3-溴硝基苯。 甲氧基浓缩试剂是碱金属甲醇钠,其选自甲醇钠和甲醇钾。 所用的甲氧化物的量为每摩尔3-溴硝基苯为1-1.5摩尔。 碱金属甲醇盐可以是预制的固体,也可以通过相应的碱金属氢氧化物和甲醇的反应在原位制备。 在使用预制的固体甲醇钠的情况下,碱金属氢氧化物的有效量为每摩尔3-溴硝基苯1.2-1.7摩尔。 反应温度在约40至80℃之间,优选反应温度为50至55℃。在原位制备甲醇盐的情况下,碱金属氢氧化物的有效量为每摩尔2.2-2.4摩尔 3溴硝基苯。 反应温度在约50至80℃之间,优选的反应温度为55至65℃。
    • 127. 发明申请
    • 3,4-DIFLUOROBENZENES AND THEIR USE IN LIQUID-CRYSTAL MIXTURES
    • 3,4-二氟苯及它们在的液晶混合物
    • WO1995009827A1
    • 1995-04-13
    • PCT/EP1994003125
    • 1994-09-19
    • MERCK PATENT GMBHSCHLOSSER, HubertJUNGBAUER, Dietmar
    • MERCK PATENT GMBH
    • C07C43/225
    • C09K19/3066C07C43/225C07C2601/14C09K19/0403C09K2019/0407
    • Described are 3,4-difluorobenzenes of formula (I) in which the symbols and indices have the following meanings: R is H, a straight-chain or branched-chain alkyl (with or without an asymmetric C-atom) with 1 to 15 C-atoms, whereby one or two non-adjacent -CH2- groups may be replaced by -O-, -CH=CH-, -CC-, cyclopropane-1,2-diyl or -Si(CH3)2- and one or more H-Atoms in the alkyl group may be substituted by F; A , A and A which may be the same or different, are 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl in which one or more H-atoms may be replaced by F, trans 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl or naphthalene-2,6-diyl; M and M , which may be the same or different, are -CH2CH2-, -CH=CH-, -CC-, -CH2CH2CH2CH2-, -CH2CH2CH2-O-, -O-CH2CH2CH2-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CH2-O-, -O-CH2, -CO-O- or -O-CO-; X is -CH2-O- or -O-CH2-; k, l, m, n, o and p are zero or one, under the condition that k+m+o is greater than zero. The compounds described have particularly low melting points. In mixtures, they improve the properties e.g. reducing the glass-transition temperature. This makes for a low viscosity and a low temperature dependence of the viscosity.
    • (I),其中符号和指数具有以下含义的式3,4-二氟苯衍生物,R <1>为H,直链或支链(具有或不具有不对称碳原子),具有1至15个碳原子,其中烷基 被-O - , - CH CH - , - CC-,环丙烷-1,2-二基或-Si(CH 3)2 =一个或两个非相邻-CH 2 - 基团可以被取代,并且其中一个或多个 所述烷基可被F取代的H原子; A <1>,A <2>,A <3>相同或不同的1,4-亚苯基,吡啶-2,5-二基,嘧啶-2,5-二基,其中一个或两个H原子被F取代 可更换,反式-1,4-亚环己基,1,3-二恶烷-2,5-二基或萘-2,6-二基; 中号<1>中,M <2>是相同的或不同的-CH 2 CH 2 - , - CH = CH - , - CC-,-CH2CH2CH2CH2-,-CH2CH2CH2 - , - O-CH 2 CH 2,-CH 2 CH 2 CO-O- ,-O-CO-CH 2 CH 2 -CH 2 -O-,-O-CH 2 - , - CO-O-或-O-CO-; X是-CH2-O-或-O-CH 2 - ; K,L,M,N,O,P是0或1,条件是K + M + O的总和是大于零。 该新型物质通过特别低的熔点表征。 在混合物中,它们具有有利的效果,例如 降低玻璃化转变温度。 这是一个低粘度和它们的低温度依赖性良好。