25189-84-8Relevant articles and documents
The reaction of perfluoro-2,5-diazahexane 2,5-dioxyl with alkenes
Green, Michael J.,Tipping, Anthony E.
, p. 115 - 126 (1993)
The liquid-phase reaction at room temperature of the title dioxyl (1) with an excess of the alkenes CH2=CHR (R = H, F, COCl), CF2=CHF, CHCl=CCl2 and cis-CHCl=CHCl gives 1:1 copolymers 3 in high yield, although with the alkenes CH2=CH2, CH2=CHF and CF2=CHF cyclic 1:1 adducts 2 are also formed in low yield.The reactions with the alkenes CH2=CMe2, CH2=CHEt, CH2=CHCO2H, and cis-HO2CCH=CHCO2H produce copolymers which are not 1:1 copolymers.The 1:1 copolymer 3f from acryloyl chloride is hydrolysed readily by water to the acrylic acid/dioxyl 1 1:1 copolymer 3j.Gas-phase reaction at room temperature of 1 with an excess of the alkenes CH2=CHR (R=Cl, Br, COCl, COF), CH2=CXCH3 (X = Cl, Br), CHCl=CCl2, cis- and trans-CHCl=CHCl, CH2=CCl2, CF2=CCl2, CF2=CFCl and CF2=CFBr affords cyclic 1:1 adducts 2 (11.5-78percent) and copolymers 3 (18.5-76.5percent): hydrolysis of the acryloyl fluoride 1:1 adduct 2j gives the acrylic acid 1:1 adduct 2s in high yield.
The molecular design of photo-curable and high-strength benzoxazine for 3D printing
Lu, Yong,Ng, Kok Wei Joseph,Chen, Hui,Chen, Xuelong,Lim, Song Kiat Jacob,Yan, Weili,Hu, Xiao
, p. 3375 - 3378 (2021)
Low viscosity photo-curable benzoxazines (BZs) are designed and synthesized for use in stereolithography 3D printing. An initial investigation shows that the thermally polymerized polybenzoxazines (PBZs) have remarkably highTg(264 °C) and flexural modulus (4.91 GPa) values. Subsequently, the formulated photoprintable resins are employed for use in high-resolution projection micro-stereolithography (PμSL) printing. Complex PBZ 3D structures can be achieved from the as-printed objects after they are thermally treated. These findings advance the design of BZ monomers for photopolymerization-based 3D printing and offer a method for the efficient fabrication of high-performance thermosets for various demanding engineering applications.
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Wolfrom,M.L. et al.
, p. 2597 - 2599 (1961)
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Synthesis, characterization and ionic conductivity of supramolecular structure of uracil-functionalized PEG/LiClO4 blend system
Rajendran,Jaisankar
, p. 646 - 648 (2015)
In this paper, the synthesis and ionic conductivity behaviour of supramolecular structure based end group functionalized poly(ethylene glycol) with uracil are reported. The uracil (U) functionalized poly(ethylene glycol) (PEG), (U-PEG-U) was synthesised through Michael addition. The synthesized polymer electrolyte was characterized by Fourier-transform infrared and nuclear magnetic resonance spectral methods. Further, we described the interaction behaviour of synthesized polymer electrolyte with Li+ ions. Differential scanning calometry and FTIR studies demonstrates that the significant ability of functionalized poly(ethylene glycol) to donate its electron to coordinate with lithium ion. It is further observed that the ionic conductivity of polymer electrolyte is not only dependent on the electron donation strength of carbonyl group, but also on the molecular structure of polyester.
Fabrication of poly[zinc aerylate-co-acrylic poly(ethylene glycol) ester] Nanoflbers
Zhao, Qingchun,Xu, Ling
, p. 378 - 379 (2009)
In this paper, we report a facile chemical route to fabricate polymer nanofibers under ambient conditions using aqueous/organic polymerization. The chemical structures of obtained polymers were investigated by infrared spectra and 1H NMR. Scanning electron microscopy (SEM) observation shows poly[zinc acrylate-co-acrylic poly(ethylene glycol) ester] nanofibers with average diameter 100-140 nm and several micrometers length. A possible mechanism for the formation of polymer nanofibers was investigated. Copyright
Asymmetric Allylation Catalyzed by Chiral Phosphoric Acids: Stereoselective Synthesis of Tertiary Alcohols and a Reagent-Based Switch in Stereopreference
Lazzarotto, Mattia,Hartmann, Peter,Pletz, Jakob,Belaj, Ferdinand,Kroutil, Wolfgang,Payer, Stefan E.,Fuchs, Michael
supporting information, p. 3138 - 3143 (2021/04/28)
The substrate scope of the asymmetric allylation with zinc organyls catalyzed by 3,3-bis(2,4,6-triisopropylphenyl)-1,1-binaphthyl-2,2-diyl hydrogenphosphate (TRIP) has been extended to non-cyclic ester organozinc reagents and ketones. Tertiary chiral alcohols are obtained with ee's up to 94% and two stereogenic centers can be created. Compared to the previous lactone reagent the stereopreference switches almost completely, proving the fact that the nature of the organometallic compound is of immense importance for the asymmetry of the product. (Figure presented.).
Zinc-Catalyzed β-Functionalization of Cyclopropanols via Enolized Homoenolate
Sekiguchi, Yoshiya,Yoshikai, Naohiko
supporting information, p. 18400 - 18405 (2021/11/16)
We report herein a zinc-catalyzed β-allylation of cyclopropanols with Morita-Baylis-Hillman (MBH) carbonates with retention of the cyclopropane ring. The reaction is promoted by a zinc aminoalkoxide catalyst, affording cyclopropyl-fused α-alkylidene-δ-valerolactone derivatives in moderate to good yields. Mechanistic experiments suggest that the present reaction does not proceed via direct β-C-H cleavage of the cyclopropanol, but involves zinc homoenolate and its enolization to generate a key bis-nucleophilic species. α-Allylation of this "enolized homoenolate"with MBH carbonate would be followed by regeneration of the cyclopropane ring and irreversible lactonization. The enolized homoenolate mechanism has also been proven to allow for β-functionalization with alkylidenemalononitrile as the reaction partner. A sequence of the present reaction and known cyclopropanol transformation provides an opportunity to transform a simple cyclopropanol into α,β- or β,β-difunctionalized ketones.
