1568-80-5Relevant academic research and scientific papers
Spiro-bis-benzoxazole diamine and preparation method and application thereof, polyimide and preparation method and application thereof
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Paragraph 0065-0066; 0185-0186, (2021/09/04)
The invention belongs to the technical field of macromolecules, and particularly relates to spirobibenzoxazole diamine, a preparation method and application thereof, polyimide and a preparation method and application thereof. According to the present invention, the spiro-bis-benzoxazole diamine is adopted as the monomer to prepare the polyimide, and the spiro structure is introduced into the diamine structure, such that the obtained polyimide has excellent solubility and excellent processability; meanwhile, the polyimide forms a microporous structure, so that the gas permeability of the polyimide is improved.
Development of C2-Symmetric Chiral Spirocyclic Phase-Transfer Catalysts: Synthesis and Application to Asymmetric Alkylation of Glycinate Schiff Base
Xu, Changming,Qi, Yinsheng,Yang, Xinshuang,Li, Xiangfan,Li, Zhenpeng,Bai, Lei
supporting information, p. 2890 - 2894 (2021/05/05)
A class of C2-symmetric chiral spirocyclic phase-transfer catalysts based on tetramethyl-1,1′-spirobiindane scaffold was synthesized from commercially available bisphenol A in 12 steps with 22-25% total yields, which features a more rigid and stable backb
Organic compound and organic electroluminescent device thereof
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Paragraph 0132-0134, (2020/11/23)
The invention provides an organic compound and an organic light-emitting device thereof, and relates to the technical field of organic photoelectric materials. According to the invention, the organiccompound provided by the invention is obtained by introd
CFA-18: A homochiral metal-organic framework (MOF) constructed from rigid enantiopure bistriazolate linker molecules
Bredenk?tter, Bj?rn,Bultinck, Patrick,Herrebout, Wouter,Kanschat, Lisa,Knippen, Katharina,Kraft, Maryana,Sugimoto, Kunihisa,Vermeyen, Tom,Volkmer, Dirk
, p. 15758 - 15768 (2020/11/24)
In this work, we introduce the first enantiopure bistriazolate-based metal-organic framework, CFA-18 (Coordination Framework Augsburg-18), built from the R-enantiomer of 7,7,7′,7′-tetramethyl-6,6′,7,7′-tetrahydro-3H,3′H-5,5′-spirobi[indeno[5,6-d]-[1,2,3]triazole] (H2-spirta). The enantiopurity and absolute configuration of the new linker were confirmed by several chiroselective methods. Reacting H2-spirta in hot N,N-dimethylformamide (DMF) with manganese(ii) chloride gave CFA-18 as colorless crystals. The crystal structure with the composition [Mn2Cl2(spirta)(DMF)2] was solved using synchrotron single-crystal X-ray diffraction. CFA-18 shows a framework topology that is closely related to previously reported metal-azolate framework (MAF) structures in which the octahedrally coordinated manganese(ii) ions are triazolate moieties, and the chloride anions form crosslinked one-dimensional helical chains, giving rise to hexagonal channels. In contrast to MAFs crystallizing in the centrosymmetric space group R3, the handedness of the helices found in CFA-18 is strictly uniform, leading to a homochiral framework that crystallizes in the trigonal crystal system within the chiral space group P3121 (no. 152). This journal is
Arylamine-based organic compound and organic light-emitting device thereof (by machine translation)
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Paragraph 0129-0132, (2020/09/16)
The invention provides an arylamine organic compound and an organic light-emitting device thereof, and relates to the technical field of organic photoelectric materials. The arylamine type organic compound disclosed by the invention adopts tetramethyl spi
Molecular engineering of high-performance nanofiltration membranes from intrinsically microporous poly(ether-ether-ketone)
Abdulhamid, Mahmoud A.,Akhtar, Faheem Hassan,Ng, Kim Choon,Park, Sang-Hee,Schwingenschl?gl, Udo,Szekely, Gyorgy,Vovusha, Hakkim
, p. 24445 - 24454 (2020/12/21)
Poly(ether-ether-ketone) has received increased attention due to its high thermal and chemical stability, and high performance in various applications. However, it suffers from a semi-crystalline morphology, low fractional free volume, and poor processability, requiring the use of harsh acidic solvents, which leads to undesired sulfonation. In this work, three intrinsically microporous poly(ether-ether-ketones) (iPEEKs), incorporating spirobisindane, Tr?ger's base, and triptycene contorted structures, were developed for organic solvent nanofiltration. Molecular dynamics simulations have assisted the molecular engineering of the polymers and the understanding of the improved membrane performance through the binding energies between solvents and polymers. Application of the design principles of polymers of intrinsic microporosity has led to a paradigm shift with a notable enhancement in both the polymer properties and the subsequently fabricated nanofiltration membranes' performance. The iPEEKs showed excellent solution processability, a high surface area of 205-250 m2 g-1, and excellent thermal stability. Mechanically flexible nanofiltration membranes were prepared from N-methyl-2-pyrrolidone dope solution at iPEEK concentrations of 19-35 wt%. The molecular weight cutoff of the membranes was fine-tuned in the range of 450-845 g mol-1 displaying 2-6 fold higher permeance (3.57-11.09 L m-2 h-1 bar-1) than previous reports. The long-term stabilities were demonstrated by a 7 day continuous cross-flow filtration. This journal is
Aromatic polyimides containing pyridine and spirocyclic units: Preparation, thermal and gas separation properties
Wang, Shuli,Ma, Shengqi,He, Hongru,Ai, Wenming,Wang, Daming,Zhao, Xiaogang,Chen, Chunhai
, p. 199 - 208 (2019/03/14)
Six polyimides, containing pyridine and spirocyclic units, were successfully synthesized by chemical imidization. Structure-dependent properties such as thermal decomposition temperatures and gas permeabilities of the high-performance polymers were explicitly investigated. Results showed that all polyimide films exhibited good solubility in common organic solvents and non-polar solvents such as chloroform and tetrahydrofuran. The polymers exhibited good thermal stability, all demonstrating thermal decomposition temperatures (Td10%) over 496 °C in nitrogen. Important from a commercial viewpoint, the permeability coefficients of these for the acidic gas CO2 showed an increase over other tested gases by virtue of the basic group pyridine (C–N linkages) in their structures.
Atroposelective Phosphoric Acid Catalyzed Three-Component Cascade Reaction: Enantioselective Synthesis of Axially Chiral N-Arylindoles
Wang, Lei,Zhong, Jialing,Lin, Xufeng
supporting information, p. 15824 - 15828 (2019/10/28)
An efficient organocatalytic atroposelective three-component cascade reaction of 2,3-diketoesters, aromatic amines, and 1,3-cyclohexanediones has been developed for the highly enantioselective synthesis of axially chiral N-arylindoles. The success of this method derives from the use of a newly developed second-generation chiral spirocyclic phosphoric acid as the catalyst. In addition, this protocol was extended to the synthesis of an axially chiral monophosphorus ligand.
Synthesis and Optical Resolution of 3,3,3′,3′-Tetramethyl-1,1′-spirobiindane-7,7′-diol
Zhou, Qiaoxia,Pan, Rihuang,Shan, Huanyu,Lin, Xufeng
, p. 557 - 563 (2019/01/10)
A novel chiral C 2-symmetric spiro diol, 3,3,3′,3′-tetramethyl-1,1′-spirobiindane-7,7′-diol (TMSIOL), was conveniently prepared via practical seven-step route from Bisphenol A in 45.1% overall yield. l-Menthyl chloroformate is used as optical r
Diamine monomer, preparation method therefor, polyimide and preparation method therefor
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Paragraph 0098-0100, (2019/04/10)
The invention relates to the technical field of organic chemistry and particularly relates to a diamine monomer, a preparation method therefor, polyimide and a preparation method therefor. According to the diamine monomer provided by the invention, the diamine monomer provided by the invention contains a spiro center (two rings share one atom) and has a non-coplanar structure, the rigidity of molecular chains is improved, and thus, the condition that continuous micropores are formed inside polyimide, holes are many, and the molecular structure is loose is caused due to the fact that macromolecular principal chains in the polyimide prepared from the diamine monomer provided by the invention cannot rotate freely and effective accumulation among the molecular chains is inhibited, so that thegas permeability, solubility and the like of a polyimide film prepared from the diamine monomer provided by the invention can be improved on the premise that selectivity is kept; and furthermore, thepolyimide prepared from the diamine monomer provided by the invention has relatively good solubility and light transmittance.
