m eta -(Aryloxy)phenols 由 DBU 与 2-bromo-3-(aryloxy)cyclohex-2-en-1-ones 作用形成,后者很容易从 3-chlorocyclohex-2-en-1-ones 中获得两个步骤:用芳氧基取代氯(ArOH、K 2 CO 3、在 100 °C 下回流丙酮或 DMF)和溴化(NBS、DMF、室温)。该过程提供了一种温和的替代经典乌尔曼反应的方法,不需要任何金属催化剂。如果原始苯酚 (ArOH) 带有供电子基团,则该方法效果很好,但当取代基吸电子时,芳构化步骤 (DBU) 会伴随 ArO 单元的一些损失。
dibromoarenes) reacted with diphenols, catalyzed by CuI/Fe(acac)3 in the presence of K2CO3 in anhydrous DMSO at 110 °C for 7 days under nitrogen atmosphere, to afford macrocyclic aryl ethers effectively. To expand this methodology, a cyclic hepta(p-phenylene oxide) and cyclic deca(p-phenylene oxide) were synthesized in one pot. Some macrocyclic aryl ethers showed strong fluorescence in acetone at 25 °C.
在K 2 CO 3的存在下,在无水DMSO中,氮气氛下,CuI / Fe(acac)3催化二碘芳烃(或二溴芳烃)与二酚反应,在110°C的条件下,在氮气氛下,将其催化7天,从而有效地提供了大环芳基醚。为了扩展该方法,在一个罐中合成了环状七(对苯醚)和环状十(对苯醚)。一些大环芳基醚在25°C的丙酮中显示强荧光。
Compositions for producing polymers of high refractive index and low yellowness
申请人:PPG INDUSTRIES, INC.
公开号:EP0224123A2
公开(公告)日:1987-06-03
The yellowness of polymerizates formed from polymerizable compositions containing bisphenol bis(allylic carbonate)-functional material is reduced by inclusion of one or more cyclohexenic compounds in the polymerizable compositions.
A polycarbonate resin composition which has high rigidity, excellent dimensional stability, and low linear expansion properties. The polycarbonate resin composition contains, relative to 100 parts by mass of a polycarbonate resin (A), 10 to 100 parts by mass of an acrylonitrile-styrenic copolymer (B), 10 to 100 parts by mass of glass flakes (C) having an average thickness of 0.45 to 1 μm, and 5 to 50 parts by mass of glass fibers (D) having an elliptical cross section with an ellipticity of more than 1.5 and not more than 8, wherein the mass ratio (D)/(C) of the content of the glass fibers (D) having an elliptical cross section to the content of the glass flakes (C) is 0.1 to 1.
The present invention is a copolymer obtained by condensation, a condensation reaction of a leaving group and a nucleophilic group, of a mixture of the following (A) and (C) with a mixture of (B) and (D), or of a mixture of (A), (B), (C) and (D):
(A) a monomer having two leaving groups and further at least one acid group in a molecule;
(B) a monomer having two nucleophilic groups and further at least one acid group in a molecule;
(C) a monomer having two leaving groups and substantially no acid group in a molecule; and
(D) a monomer having two nucleophilic groups and substantially no acid group in a molecule.