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1940-57-4 Usage

Chemical Properties

yellow to beige-orange crystalline powder


9-Bromofluorene, is used to treat skin dermatological conditions and in pharmaceutical industry.

Check Digit Verification of cas no

The CAS Registry Mumber 1940-57-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,4 and 0 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1940-57:
84 % 10 = 4
So 1940-57-4 is a valid CAS Registry Number.

1940-57-4 Well-known Company Product Price

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  • Alfa Aesar

  • (A10428)  9-Bromofluorene, 98+%   

  • 1940-57-4

  • 5g

  • 353.0CNY

  • Detail
  • Alfa Aesar

  • (A10428)  9-Bromofluorene, 98+%   

  • 1940-57-4

  • 50g

  • 1365.0CNY

  • Detail
  • Alfa Aesar

  • (A10428)  9-Bromofluorene, 98+%   

  • 1940-57-4

  • 250g

  • 5637.0CNY

  • Detail

1940-57-4Relevant articles and documents

Synthesis of novel fluorene-functionalised nanoporous silica and its luminescence behaviour in acidic media

Yadavi, Marzieh,Badiei, Alireza,Ziarani, Ghodsi Mohammadi,Abbasi, Alireza

, p. 751 - 758 (2013)

Fluorene-functionalised nanoporous silica (FL-NH2-SBA-15) was prepared using the post-synthesis grafting method of SBA-15. The material thus obtained was characterised by means of small- and wide-angle X-ray diffraction, nitrogen adsorption-desorption, Fourier transform infrared spectroscopy, Raman spectroscopy, thermogravimetric analysis, and elemental analysis. The results showed that the organised structure is preserved after the post-grafting procedure. Surface area and pore-size decreased by attaching functional groups to the pore surface. In addition, the pore volume was reduced with functionalisation. The amount of fluorene grafted onto the surface of SBA-15 was 0.55 mmol with a yield of approximately 46 %. The emission spectra of FL-NH2-SBA-15 in acidic media were studied and are discussed in detail. The structural change between FL-NH2-SBA-15 and the protonated form might be an effective candidate for acid-dependent molecular-sensor models for advanced application in molecular sensors in the future.

C-9 fluorenyl substituted anthracenes: A promising new family of blue luminescent materials

Wang, Jing,Wan, Wen,Jiang, Haizhen,Gao, Yan,Jiang, Xueyin,Lin, Huaping,Zhao, Weiming,Hao, Jian

, p. 3874 - 3877 (2010)

Syntheses, optical, and electrochemical properties of novel C-9 fluorenyl substituted anthracenes linked by a tetrahedral sp3-hybridized carbon atom are reported for blue light emitting materials. Remarkably, an unoptimized organic light-emitting diode based on 1-fold fluorene-functionalized anthracene 3 exhibits a radiance of 4100 cd/m2 at 12 V and a maximum EL efficiency of 1.36 cd/A with color purity CIE x, y (0.157, 0.082), which is very close to the National Television System Committee standard blue.

Design and synthesis of 9H-fluorenone based 1,2,3-triazole analogues as Mycobacterium tuberculosis InhA inhibitors

Suresh, Amaroju,Srinivasarao, Singireddi,Agnieszka, Napiórkowska,Ewa, Augustynowicz-Kope?,Alvala, Mallika,Lherbet, Christian,Chandra Sekhar, Kondapalli Venkata Gowri

, p. 1078 - 1086 (2018)

We prepared fifty various 9H-fluorenone based 1,2,3-triazole analogues varied with NH, –S–, and –SO2– groups using click chemistry. The target compounds were characterized by routine analytical techniques, 1H, 13CNMR, mass, elemental, single-crystal XRD (8a) and screened for in vitro antitubercular activity against Mycobacterium tuberculosis (MTB) H37Rv strain and two “wild” strains Spec. 210 and Spec. 192 and MIC50 was determined. Further, the compounds were evaluated for MTB InhA inhibition study as well. The final analogues exhibited minimum inhibitory concentration (MIC) ranging from 52.35 to >295?μm. Among the –NH– analogues, one compound 5p (MIC 58.34?μm), among –S– containing analogues four compounds 8e (MIC 66.94?μm), 8f (MIC 74.20?μm), 8g (MIC 57.55?μm), and 8q (MIC 56.11?μm), among –SO2– containing compounds one compound 10p (MIC 52.35?μm) showed less than MTB MIC 74.20?μm: Compound 4-(((9H-fluoren-9-yl)sulfonyl)methyl)-1-(3,4,5-trimethoxyphenyl)-1H-1,2,3-triazole (10p) was found to be the most active compound with 73% InhA inhibition at 50?μm; it inhibited MTB with MIC 52.35?μm. Further, 10f and 10p were docked to crystal structure of InhA to know binding interaction pattern. Most active compounds were found to be non-cytotoxic against HEK 293 cell lines at 50?μm.



, p. 895 (1948)


Blue fluorescent host compound, and preparation method and device thereof


Paragraph 0070-0074, (2020/01/12)

The invention relates to a blue fluorescent host compound, and a preparation method and a device thereof. The structural formula of the blue fluorescent host compound is represented by chemical formula 1 shown in the description. Compared with a conventional material, the blue fluorescent host compound of the invention has the advantages of excellent electroluminescent properties, long device service life and proper color coordinates. The organic light-emitting device prepared from the blue fluorescent host compound adopts the novel compound of the chemical formula 1, so that the device becomes the organic light-emitting device with a high efficiency and a long service life. The preparation method of the blue fluorescent host compound has the advantages of simple process and high yield.

Carbocation Catalyzed Bromination of Alkyl Arenes, a Chemoselective sp3 vs. sp2 C?H functionalization.

Ni, Shengjun,El Remaily, Mahmoud Abd El Aleem Ali Ali,Franzén, Johan

supporting information, p. 4197 - 4204 (2018/09/25)

The versatility of the trityl cation (TrBF4) as a highly efficient Lewis acid organocatalyst is demonstrated in a light induced benzylic brominaion of alkyl-arenes under mild conditions. The reaction was conducted at ambient temperature under common hood light (55 W fluorescent light) with catalyst loadings down to 2.0 mol% using N-bromosuccinimide (NBS) as the brominating agent. The protocol is applicable to an extensive number of substrates to give benzyl bromides in good to excellent yields. In contrast to most previously reported strategies, this protocol does not require any radical initiator or extensive heating. For electron-rich alkyl-arenes, the trityl ion catalyzed bromination could be easily switched between benzylic sp3 C?H functionalization and arene sp2 C?H functionalization by simply alternating the solvent. This chemoselective switch allows for high substrate control and easy preparation of benzyl bromides and bromoarenes, respectively. The chemoselective switch was also applied in a one-pot reaction of 1-methylnaphthalene for direct introduction of both sp3 C?Br and sp2 C?Br functionality. (Figure presented.).

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