- Fluorine-containing aromatic diamine compound and preparation method thereof, and fluorine-containing polyimide compound and preparation method thereof
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The invention provides a fluorine-containing aromatic diamine compound and a preparation method thereof, and a fluorine-containing polyimide compound and a preparation method thereof. The fluorine-containing aromatic diamine compound has a structural general formula shown in the specification. The preparation method of the fluorine-containing aromatic diamine compound comprises the following stepsof: mixing materials including a compound A and a compound B, carrying out a first reaction to obtain a compound C, and carrying out a hydrogenation reaction on the compound C to obtain the fluorine-containing aromatic diamine compound. Raw materials of the fluorine-containing polyimide compound comprise the fluorine-containing aromatic diamine compound. The preparation method of the fluorine-containing polyimide compound comprises the following steps of: mixing materials including the fluorine-containing aromatic diamine compound and a dianhydride compound to obtain a mixture, and then carrying out a sixth reaction to obtain a precursor; and carrying out dehydration cyclization reaction on the pre-polymer, and carrying out post-treatment to obtain the fluorine-containing polyimide compound. The polyimide compound prepared from the fluorine-containing aromatic diamine compound provided by the invention is good in solubility, relatively high in transmittance and good in mechanical property.
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Paragraph 0129; 0130-0133
(2021/01/29)
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- Coordinating Activation Strategy-Induced Selective C?H Trifluoromethylation of Anilines
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A simple protocol for the synthesis of 2-(trifluoromethyl)aniline derivatives through a coordinating activation strategy was developed. The reaction showed good reactivity and gave the target products in moderate to good yields. Pleasingly, the directing group could be recovered in excellent yield. Furthermore, this strategy allowed efficient access to the synthesis of floctafenine. A single-electron-transfer mechanism was proposed to be responsible for this trifluoromethylation reaction.
- Xu, Jun,Cheng, Ke,Shen, Chao,Bai, Renren,Xie, Yuanyuan,Zhang, Pengfei
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p. 965 - 970
(2018/02/12)
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- Preparation 2-trifluoromethyl-4-substituted aniline compounds
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The invention relates to a method for preparing 2-trifluoromethyl-4-substituted phenylamine and 2-trifluoromethyl-4-substituted acetanilide. The method for preparing the2-trifluoromethyl-4-substituted phenylamine and 2-trifluoromethyl-4-substituted acetanilide comprises the following main step: in the presence of sodium trifluoromethanesulfonate and tert-butyl hydroperoxide but no metal salt catalyst and under the stirring condition, maintaining a 4-substituted phenylamine compound (concrete structure shown in a formula II is described in the specification) in a reaction medium of mixture composed of dichloromethane and water at the temperature of 0-25 DEG C for 72-120 hours, so that the 2-trifluoromethyl-4-substituted phenylamine target product is obtained. The preparation method provided by the invention has potential commercial value.
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Paragraph 0023-0026; 0092-0095
(2017/02/23)
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- Copper-free direct C-H trifluoromethylation of acetanilides with sodium trifluoromethanesulfinate
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A copper-free direct C-H ortho trifluoromethylation of electron-deficient 4-substituted acetanilides using Langlois reagent (NaSO2CF3) as the CF3 source in the presence of tert-butyl hydroperoxide (tBuOOH, TBHP) was developed.
- Wu, Mingxi,Ji, Xinfei,Dai, Wenpeng,Cao, Song
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p. 8984 - 8989
(2015/01/09)
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- Catalytic reduction of ortho - And para -azidonitrobenzenes via tert -butoxide ion mediated electron transfer
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The reduction of a range of substituted azidonitrobenzene derivatives to the corresponding aniline is described. The chemoselective reaction proceeds cleanly and in good yield, generating minimal waste products. The process involves a thiazolium salt derived species which is proposed as a radical anion relay, with tert-butoxide as the stoichiometric reductant.
- Burnley, James,Carbone, Giorgio,Moses, John E.
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supporting information
p. 652 - 656
(2013/04/10)
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- The [Cu]-catalyzed SNAR reactions: Direct amination of electron deficient aryl halides with sodium azide and the synthesis of arylthioethers under Cu(II) - Ascorbate redox system
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A one pot [Cu]-promoted SNAr reaction of electron-deficient halobenzenes with sodium azide and the reduction of the intermediate aryl azides under the same Cu(II)-ascorbate redox conditions leading to anilines has been documented. Control experiments revealed that both ascorbate and proline play important role in the reaction path way. Further, the use of this catalytic Cu(II)-ascorbate redox system has been explored for the synthesis of arylthioethers.
- Goriya, Yogesh,Ramana
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experimental part
p. 7642 - 7650
(2010/12/19)
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- A convenient copper-catalyzed direct animation of nitroarenes with 9-alkylhydroxylamines
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O-Alkylhydroxylamines, particularly O-methylhydroxylamine, aminate nitroarenes in the presence of a strong base and a copper catalyst to give aminonitroarenes in good yields, ortho- or para-Animation with respect to the nitro group takes place, and in some cases the ortho-aminated product is preferentially obtained. With 3-substituted nitrobenzenes where the substituent has a lone pair of electrons, preferential amination occurs at the 2-position to give the sterically most congested 3c-f, 14 and 22g.
- Seko, Shinzo,Miyake, Kunihito,Kavvamura, Norio
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p. 1437 - 1444
(2007/10/03)
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- Nitroarylamines via the Vicarious Nucleophilic Substitution of Hydrogen: Amination, Alkylamination, and Arylamination of Nitroarenes with Sulfenamides
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A new reaction of sulfenamides with electrophilic arenes under basic conditions is described. The σ adducts formed from nitroarenes and the anions of sulfenamides undergo elimination of thiol to produce the corresponding o- and/or p-nitroanilines. This reaction is analogous to the known alkylation and hydroxylation of nitroarenes via the vicarious nucleophilic substitution of hydrogen (VNS). The reaction gives access to a wide range of substituted nitroanilines, nitronaphthylamines, and aminoheterocycles. By means of the reaction with N-alkyl- and N-arylsulfenamides, it is possible to obtain N-alkylnitroanilines and nitrodiarylamines. By varying the structure of sulfenamide and the reaction conditions, particularly the nature and concentration of the base, it is possible to control the orientation of animation.
- Makosza, Mieczyslaw,Bialecki, Maciej
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p. 4878 - 4888
(2007/10/03)
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- Process for the preparation of aromatic amines
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Electrophilic aromatic compounds can be reacted with sulphenamides in the presence of bases to form the corresponding aromatic amines.
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- Amination of Nitroarenes with Sulfenamides via Vicarious Nucleophilic Substitution of Hydrogen
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Nitroarenes react with sulfenamides RSNH2 in the presence of strong bases to give p- and o-nitroanilines.
- Makosza, Mieczyslaw,Bialecki, Maciej
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p. 4784 - 4785
(2007/10/02)
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- Direct Nitration of Anilines Using Nitrocyclohexadienones
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Nitrocyclohexadienones (in particular, 2,3,5,6-tetrabromo-4-methyl-4-nitro-2,5-cyclohexadienone) are used as reagents for the direct nitration of anilines.Depending on the conditions, good yields of C-nitroanilines are obtained.Under the same conditions, N,N-dimethylaniline is converted into N-methyl-N-nitroaniline.
- Lemaire, M.,Guy, A.,Boutin, P.,Guette, J. P.
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p. 761 - 763
(2007/10/02)
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