Liquid crystal naphtalene compounds, represented by the following formula (1) are disclosed.
R-Z-A-NAP-Z′-R′ (1)
In the formula (1), R is an alkyl group containing 1 to 18 carbon atoms; R′ is an alkyl group containing 1 to 21 carbon atoms; NAP represents 2,6-naphthylene group; A, Z and Z′ are as follows: 1) A is Pyr> and (a) Z is - or # and Z′ is O, or (b) Z is - and Z′ is COO; 2) if A is Pym>, (a) Z is - and Z′ is O, or (b) Z is O and Z′ is -, O or #; 3) A is FPhF and (a) Z is - or O and Z′ is -, O or COO, (b) Z is OCO and Z′ is - or O, or (c) Z is # and Z′ is O; 4) A is PhF and (a) Z is - or # and Z′ is O, (b) Z is O and Z′ is -, or (c) Z is - and Z′ is COO; 5) A is FPh and (a) Z is O and Z′ is-, (b) Z is -, O, # or OCO and Z′ is O, or (c) Z is O and Z′ is COO; 6) A is
液晶
萘化合物的
化学式如下所示:R-Z-A-NAP-Z′-R′。在这个
化学式中,R是含有1到18个碳原子的烷基基团;R′是含有1到21个碳原子的烷基基团;NAP代表2,6-
萘基团;A、Z和Z′的具体定义如下:
1)如果A是Pyr,(a) Z是-或#,Z′是O;或者(b) Z是-,Z′是COO;
2)如果A是Pym,(a) Z是-,Z′是O;或者(b) Z是O,Z′是-、O或#;
3)如果A是FPhF,(a) Z是-或O,Z′是-、O或COO;(b) Z是OCO,Z′是-或O;或者(c) Z是#,Z′是O;
4)如果A是PhF,(a) Z是-或#,Z′是O;(b) Z是O,Z′是-;或者(c) Z是-,Z′是COO;
5)如果A是FPh,(a) Z是O,Z′是-;(b) Z是-、O、#或OCO,Z′是O;或者(c) Z是O,Z′是COO;
6)如果A是
Fluoride-mediated selective cross-coupling reactions of alkyl halides and trimethyl(perfluoroalkyl)silanes, Me3SiRf (Rf=CF3, C2F5) in the absence of any catalysts
作者:Wieland Tyrra、Dieter Naumann、Silke Quadt、Sigrid Buslei、Yurii L. Yagupolskii、Mikhail M. Kremlev
DOI:10.1016/j.jfluchem.2007.02.017
日期:2007.7
A temperature range of −18 °C to room temperature was found to be effective for selective fluoride-mediated cross-coupling reactions of trimethyl(perfluoroalkyl)silanes, Me3SiCF3 and Me3SiC2F5, and alkyl halides, RX (X = Br, I) in the absence of any catalyst.
已发现在−18°C到室温的温度范围内对于三甲基(
全氟烷基)
硅烷Me 3 SiCF 3和Me 3 SiC 2 F 5以及烷基卤化物RX( X = Br,I)在没有任何催化剂的情况下。
Metal-free and light-promoted radical iodotrifluoromethylation of alkenes with Togni reagent as the source of CF<sub>3</sub> and iodine
作者:Redouane Beniazza、Maxime Douarre、Dominique Lastécouères、Jean-Marc Vincent
DOI:10.1039/c7cc00214a
日期:——
Iodotrifluoromethylation of alkenes is effectively conducted by combining benzophenone, “black light”, isopropanol and Togni reagent 1 as the source of both the CF3 group and iodine atom.
烯烃的
碘三
氟甲基化反应通过将苯甲酮、"黑光"、
异丙醇和Togni试剂1结合使用,有效进行,Togni试剂1同时作为
CF3基团和
碘原子的来源。
Synthetic uses of thioesters of trifluoromethylated acids. Part 2: Reactions with alkenes
作者:Thierry Billard、Nicolas Roques、Bernard R Langlois
DOI:10.1016/s0040-4039(00)00337-3
日期:2000.4
The photolysis of trifluoromethanethiosulfonates (CF3SO2SR) or trifluorothioacetates (CF3COSR) in the presence of alkenes provides (trifluoromethyl)alkanes or β-sulfanyl (trifluoromethyl)alkanes. The formation of these compounds can be controlled by the nature and the ratio of the reactants.
在烯烃存在下,三
氟甲
硫基
磺酸盐(CF 3 SO 2 SR)或
三氟硫代乙酸盐(CF 3 COSR)的光解提供了(三
氟甲基)
烷烃或β-
硫烷基(三
氟甲基)
烷烃。这些化合物的形成可以通过反应物的性质和比例来控制。
Photocatalytic hydrofluoroalkylation of alkenes with carboxylic acids
作者:Kang-Jie Bian、Yen-Chu Lu、David Nemoto、Shih-Chieh Kao、Xiaowei Chen、Julian G. West
DOI:10.1038/s41557-023-01365-0
日期:2023.12
fluoroalkyl carboxylic acids as the sole reagents. Hydrotrifluoro-, difluoro-, monofluoro- and perfluoroalkylation are all demonstrated, with broad scope, mild conditions (redox neutral) and potential for late-stage modification of bioactive molecules. Critical to success is overcoming the exceedingly high redox potential of feedstock fluoroalkyl carboxylic acids such as trifluoroacetic acid by leveraging cooperative
在药物中掺入氟烷基基序可以增强母体分子的治疗特性。烯烃的氢氟烷基化已成为获得多种氟烷基化化合物的有前途的途径;然而,目前的方法需要超
化学计量氧化剂、昂贵/氧化性氟烷基化试剂和贵
金属,并且通常表现出有限的范围,因此非常需要解决这些限制的通用方案。在这里,我们报道了烯烃的氢氟烷基化反应,其中廉价、丰富且可用 氟烷基
羧酸 作为唯一试剂。氢三
氟、二
氟、单
氟和
全氟烷基化均已得到证明,具有范围广、条件温和(氧化还原中性)和
生物活性分子后期修饰的潜力。成功的关键是利用地球上丰富的廉价
铁和氧化还原活性巯基
硫醇催化作用,克服原料氟烷基
羧酸(如
三氟乙酸)极高的氧化还原潜力,使这些试剂无需预活化即可直接用作氢
全氟烷基化供体。初步的机理研究支持这种合作过程的根本性质。
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