7300-91-6Relevant academic research and scientific papers
Optimal synthetic design of second-order nonlinear optical material with good temporal stability
Choi,Song,Jahng,Kim
, p. 17 - 26 (1996)
Second-order nonlinear optical copolymers containing p-hydroxyphenyl maleimide or 4-cinnamoyloxy-phenylmaleimide as a comonomer were newly synthesized. For improving the temporal stability, we adopted the crosslink reaction thermally and photochemically. Second-order nonlinear optical properties of the poled/cured films were investigated in terms of the second harmonic generation (SHG) and linear electro-optic (EO) coefficient measurement. SHG coefficient, d33 was found to be 14 pm/V at the fundamental wavelength of 1064 nm and EO coefficient, r33 was found to be 25-30 pm/V at 633 nm wavelength in two different crosslinked structures. To prevent the orientational relaxation of poled polymer, thermal crosslink reaction was induced using diisocyanate as a crosslinker between the side chains themselves. Another photo-crosslink was induced exposing the film at 257 nm wavelength during poling. Temporal stabilities of second-order NLO coefficients of crosslinked polymer systems were proved much better than that of guest-host system or other side chain polymers.
Comment on: Synthesis of new azo compounds based on N-(4-Hydroxyphenyl)maleimide and N-(4-Methylphenyl)maleimide. Molecules 2010, 15, 7498–7508
Morrison, John J.,Brandt, Viktoria K.,Yeates, Stephen G.
, (2019)
The synthesis of (E)-phenylazo-3-N-(4-hydroxyphenyl)maleimide (1) using a procedure previously reported in Molecules is deemed to be erroneous. A detailed re-investigation of the earlier work suggests that the spectral data for key intermediates and the final product, (1), was mis-assigned. We conclude that compound (1) was not synthesized, but rather an unusual ring opening reaction of the maleimide unit of the starting material, N-(4-hydroxyphenyl)maleimide (2) leading to the generation of (Z)-4-((4-hydroxyphenyl)amino)-4-oxobut-2-enoic acid, (3) was observed instead. Examination of the original experimental data reveals systematic errors in the reporting of all of the combustion microanalytical data. Overall, the present investigation suggests that errors in the interpretation of spectral data, falsification of analytical data and selective editing of experimental results raise questions over the veracity of the work presented in the original paper.
Application of maleimide compound as chitin synthase inhibitor
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Paragraph 0120-0123; 0136-0139, (2020/07/12)
The invention discloses an application of a maleimide compound as shown in a formula I. In the formula I, R0 is phenyl, benzyl, phenethyl, phenylpropyl, p-fluorophenyl, p-chlorophenyl, p-bromophenyl,p-methoxyphenyl, p-methylphenyl or p-hydroxyphenyl, R1 is hydrogen, methyl, phenyl or chlorine; and R2 is hydrogen, methyl, phenyl or chlorine. The provided maleimide compound has a good inhibition effect on chitin synthase.
New phosphorus- and nitrogen-containing poly(methyl methacrylate)-based copolymer: Enhanced flame retardancy and thermal stability
Shi, Xingxing,Jiang, Saihua,Xiao, Liang
, p. 333 - 342 (2019/06/17)
Pure poly(methyl methacrylate) (PMMA) always exhibits high flammability and low thermal stability. To address that, a novel reactive comonomer containing phosphorus and nitrogen elements, 4-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl) phenyl diethylphosphoramidate (PDM), was successfully synthesized and then introduced into PMMA matrix through emulsion copolymerization method. The structure of PDM and as-obtained poly(MMA-co-PDM) copolymers was characterized using Fourier transform infrared (FT-IR), 1H nuclear magnetic resonance spectroscopy (1H NMR) and 31P NMR. From thermal gravimetric analysis and microscale combustion calorimeter, the poly(MMA-co-PDM) copolymers exhibit significantly enhanced flame retardancy and thermal stability, such as the higher degradation temperatures, and decreased peak heat release rate (maximally by 24.1%) and total heat release (maximally by 22.1%). The glass transition temperature (Tg) values of poly(MMA-co-PDM) copolymers obtained by differential scanning calorimetry slightly decrease as the raising flexibility of polymer chain. The char residue analysis by scanning electron microscopy and FT-IR demonstrates that the incorporation of PDM can catalyze the charring of copolymers in condensed phase and form an excellent thermal stability char residue with aromatic structure, further preventing the inner substrate from further combustion. The detailed mechanism was proposed.
Monomer compound and preparation method thereof, and copolymer, preparation method and applications thereof
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Paragraph 0085-0087; 0090; 0091; 0115; 0117; 0120; 0121, (2020/04/17)
The invention relates to the technical field of polymer oil displacement, and discloses a monomer compound and a preparation method thereof, and a copolymer, a preparation method and applications thereof. The monomer compound provided by the invention has a structure represented by a formula (1), is a temperature-resistant and salt-resistant functional monomer, can improve the tackifying property,the temperature resistance and the salt resistance of a copolymer after being introduced into the copolymer, and can make the copolymer have a certain surface activity so as to be well applied to theoil extraction process of an oil field.
A Photochemical Ligation System Enabling Solid-Phase Chemiluminescence Read-Out
Delafresnaye, Laura,Schmitt, Christian W.,Barner, Leonie,Barner-Kowollik, Christopher
supporting information, p. 12538 - 12544 (2019/07/15)
The peroxyoxalate chemiluminescence (PO-CL) reaction is among the most powerful and versatile techniques for the detection of hydrogen peroxide (H2O2) and has been employed in various biological and chemical applications over the past 50 years. However, its two-component nature (peroxyoxalate and fluorophore) limits its use. This contribution introduces an innovative and versatile photochemical platform technology for the synthesis of inherently fluorescent PO probes by exploiting the nitrile imine-mediated tetrazole-ene cycloaddition (NITEC) reaction. In the presence of hydrogen peroxide, the pioneered “2-in-1” molecule emits either yellow or blue light, depending on tetrazole (Tz) structure. Even in the absence of base, the emitted light remains visible and H2O2 could be detected in the nanomolar range. Critically, the PO-Tz can be readily incorporated into polymeric materials. As a first application of this promising material, a tailor-made PO-Tz is grafted on poly(divinylbenzene) (PDVB) particles to enable solid-phase chemiluminescence on microspheres.
Novel AB-type benzoxazine monomer and preparation method thereof
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Paragraph 0029; 0030, (2019/06/07)
The invention belongs to the technical field of high-performance thermosetting resin, and discloses a novel AB-type benzoxazine monomer and a preparation method thereof. The preparation method comprises the following steps: firstly, synthesizing 4-maleimide phenol by using maleic anhydride and p-aminophenol as raw materials; and then synthesizing the AB-type benzoxazine monomer by using the 4-maleimide phenol, 2-furylamine and paraformaldehyde as raw materials. A melting point of the AB-type benzoxazine monomer is 123 DEG C; after the monomer is molten, a Diels-Alder reaction can be performedbetween a maleimide group and a furan group which are contained in the monomer; firstly, main chain benzoxazine is produced, and then benzoxazine ring opening and ring curing occur by further warming;a curing peak temperature is 213.85 DEG C; and such unique mechanism enables the resin to have good thermal performance. After the monomer is cured, a resin material has a residual carbon rate of 57%at a temperature of 800 DEG C, Td5 of 357 DEG C and Td10 of 401 DEG C. The resin material obtained by the AB-type benzoxazine monomer disclosed by the invention has excellent thermal and mechanical properties and excellent machinability, and is low in production cost and suitable for scale production.
Alizarin red S-TiO2-catalyzed cascade C(sp3)-H to C(sp2)-H bond formation/cyclization reactions toward tetrahydroquinoline derivatives under visible light irradiation
Hosseini-Sarvari, Mona,Koohgard, Mehdi,Firoozi, Somayeh,Mohajeri, Afshan,Tavakolian, Hosein
supporting information, p. 6880 - 6888 (2018/05/04)
A very low amount of organic dye (Alizarin red S) sensitized TiO2 and it was successfully used to catalyze cascade C(sp3)-H to C(sp2)-H bond formation/cyclization reactions under visible light irradiation. The modified TiO2 photocatalyst efficiently, for the first time, advanced [4+2] cyclization of N,N-dimethylanilines and maleimides to the corresponding tetrahydroquinolines in air atmosphere. The reaction proceeds through α-amino radicals without additional oxidant at ambient temperature to afford products in good to excellent yields.
Solvent-free and room temperature visible light-induced C-H activation: CdS as a highly efficient photo-induced reusable nano-catalyst for the C-H functionalization cyclization of: T -amines and C-C double and triple bonds
Firoozi, Somayeh,Hosseini-Sarvari, Mona,Koohgard, Mehdi
supporting information, p. 5540 - 5549 (2019/01/03)
Nano-sized CdS was successfully prepared, fully characterized and applied as a highly efficient reusable photocatalyst for the synthesis of pyrrolo[3,4-c]quinolone and pyrrolo[2,1-a]isoquinoline-8-carboxylate derivatives through a condensation reaction of N,N-dimethylanilines or alkyl 2-(3,4-dihydroisoquinolin-2(1H)-yl)acetates with maleimides via a C-H activation approach under benign and eco-friendly conditions at room temperature without using any solvent and oxidant under visible light irradiation. Besides, the prepared photocatalyst has been successfully applied for the condensation reaction of N,N-dimethylanilines with alkyl but-2-ynedioates or phenyl acetylenes for the synthesis of novel 1,2-dihydroquinoline-3,4-dicarboxylate and aryl-1,2-dihydroquinoline derivatives for the first time. Using this method, all favourable products were obtained in good yields and relatively short reaction times under benign conditions with the application of visible light irradiation, a renewable energy source. The catalyst was easily recovered and reused several times without any loss of its activity.
Composition, cured product and laminate
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Paragraph 0181; 0182; 0183; 0190; 0191, (2019/04/26)
The present invention addresses the problem of providing a composition that has excellent heat resistance and excellent adhesiveness. The present invention also addresses the problem of providing: a cured product which is obtained by curing this composition; and a laminate which contains this cured product. The present invention also addresses the problem of providing a heat-resistant material, a heat-resistant member, an electronic material and an electronic member, each of which contains this composition. The above-mentioned problems are solved by providing a composition that contains: a (meth)allyl group-containing maleimide compound which is characterized by having a structure that has one or more benzene rings and by having one or more groups each having a (meth)allyl group and one or more groups each having a maleimide group; and a hydroxyl group-containing maleimide compound which is characterized by having a structure that has one or more benzene rings and by having one or more groups each having a hydroxyl group and one or more maleimide groups.
