- Stilbene solid fluorescent material
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The invention discloses a stilbene solid fluorescent material, and belongs to the field of functional materials. The stilbene compound provided by the invention has a simple molecular skeleton structure, and the synthesis method is simple and convenient. The fluorescent material has weak fluorescence in a solution state. By testing the fluorescence emission intensity of the fluorescent material in a tetrahydrofuran and water mixed solvent with the water content of 0-99%, the fluorescent material is found to have obvious aggregation-induced emission property. The fluorescent material can emit bright blue fluorescence in a solid powder state, has very high absolute fluorescence quantum yield, and has a potential application in the photoelectric field.
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Paragraph 0052-0057
(2021/08/19)
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- A stilbene compound of preparation method
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The invention provides a preparation method of toluylene compounds. A deep eutectic solvent formed by use of choline chloride and amide is taken as a reaction solvent, and substituted or unsubstituted diethyl benzylphosphonate and substituted or unsubstituted benzaldehyde are taken as raw materials to have a Wittig-Horner reaction under catalysis of an alkali, and consequently, the toluylene compounds can be obtained. According to the preparation method, the deep eutectic solvent formed by use of choline chloride and amide is taken as the reaction solvent, and the solvent is suitable for the synthesis of the toluylene compounds; the preparation method has the advantages of good universality, mild reaction conditions, convenient operations, low cost, environmental friendliness and the like, and is suitable for industrial production.
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Paragraph 0068-0070
(2017/05/04)
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- Palladium-catalyzed cross-coupling reactions of potassium alkenyltrifluoroborates with organic halides in aqueous media
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Potassium vinyl and alkenyltrifluoroborates are cross-coupled with aryl and heteroaryl bromides using 1 mol % Pd loading of 4-hydroxyacetophenone oxime derived palladacycle or Pd(OAc)2 as precatalysts, K 2CO3 as base, and TBAB as additive and water reflux under conventional or microwave heating to afford styrenes, stilbenoids, and alkenylbenzenes. These borates can be cross-coupled diastereoselectively with allyl and benzyl chlorides using KOH as base in acetone-water (3:2) at 50°C and 0.1 mol % Pd loading, giving the corresponding 1,4-dienes and allylarenes, respectively. These simple phosphine-free reaction conditions allow the palladium recycling from the aqueous phase during up to five runs by extractive separation of the products, which contain 58-105 ppm of Pd.
- Alacid, Emilio,Najera, Carmen
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supporting information; experimental part
p. 2321 - 2327
(2009/07/18)
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- Ruthenium(I)-catalyzed cyclopropanation reactions with (trimethylsilyl)diazomethane and aryldiazomethanes
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The polymeric ruthenium(I) complex [Ru2(CO)4(μ-OAc)2]n is a suitable catalyst for the cyclopropanation of mono-, 1,1- as well as 1,2-disubstituted, and trisubstituted alkenes with (trimethylsilyl)diazomethane, phenyl-diazomethane, and (4-cyanophenyl)diazomethane. Trisubstituted alkenes are cyclopropanated with a remarkable degree of syn-selectivity.
- Maas, Gerhard,Seitz, Jürgen
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p. 6137 - 6140
(2007/10/03)
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- THE EFFECT OF ARYL SUBSTITUENTS ON ARYLCARBENE REACTIVITY
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Substituted (p-MeO, p-Me, H, p-Cl, p-Br, m-Br, m-MeO, 3,4-Cl2, p-CO2Me, m-CN and p-CN) monophenylcarbenes are generated in a binary mixture of substrates (methanol, cis-4-methyl-2-pentene and cyclohexane) and the relative rate of O - H insertion into methanol to stereospecific cyclopropanation of the olefin to C - H insertion into cyclohexane are calculated from the ratios of products and substrates.It is found (i) that the reactivities of the substrates decrease in the order of methanol, olefin and cyclohexane and (ii) that electron-donating substituents generally lead to reaction with the more reactive substrates while the reaction with the less reactive substrates is favoured in the case of electron-withdrawing substituents.These results are interpreted in terms of the change in the electrophilicity of the singlet arylcarbene by the substituents rather than the change in the singlet-triplet equilibrium.
- Tomioka, Hideo,Tabayashi, Kazuo,Ozaki, Yasuji,Izawa, Yasuji
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p. 1435 - 1440
(2007/10/02)
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- Electron Transfer in Competition with Loss of Nitrogen in Photochemical Reactions of Aryldiazomethane with Diethylamine
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The photolysis of aryldiazomethanes was studied as a function of aryl substituents and the p-nitro group was found to exert a special effect of product distribution.
- Tomioka, Hideo,Tabayashi, Kazuo,Izava, Yasuji
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p. 906 - 907
(2007/10/02)
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- REACTIONS OF ORGANIC ANIONS. PART C. PHASE-TRANSFER ALKYLATION OF C-H ACIDS ACTIVATED BY THE ISONITRILE FUNCTION. UNPRECENDENTED β-ELIMINATION OF THE ISONITRILE GROUP
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Benzylation and nitrobenzylation reactions of isocyanides in a catalytic two-phase system and in some homolytic systems were studied.Elimination of the isocyanide group has been observed in the products obtained.
- Jawdosiuk, Mikolaj,Uminski, Maciej,Kmiotek-Skarzynska, Irena,Makasza, Mieczyslaw
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p. 1309 - 1320
(2007/10/02)
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