Synthesis and Structure of Cyclic Oligo(p-phenylene oxide)s, −(C6H4O)n− (n = 6−10)
摘要:
Stepwise growth of oligo(p-phenylene oxide)s and cyclization via the Ullmann coupling reaction by using CuI/N,N-dimethyl-glycine afforded cyclic oligo( p-phenyleneoxide)s, -(C6H4O)- (n = 6-10). The structure of the new cyclophanes was determined by X-ray crystallography, which revealed that they have planar or slightly bent structures with diameters of 1.0-1.5 nm.
Synthesis and Structure of Cyclic Oligo(p-phenylene oxide)s, −(C6H4O)n− (n = 6−10)
摘要:
Stepwise growth of oligo(p-phenylene oxide)s and cyclization via the Ullmann coupling reaction by using CuI/N,N-dimethyl-glycine afforded cyclic oligo( p-phenyleneoxide)s, -(C6H4O)- (n = 6-10). The structure of the new cyclophanes was determined by X-ray crystallography, which revealed that they have planar or slightly bent structures with diameters of 1.0-1.5 nm.
Vorob'ev,Yu.P.; Segeev,V.A., Journal of Organic Chemistry USSR (English Translation), 1968, vol. 4, p. 70 - 73
作者:Vorob'ev,Yu.P.、Segeev,V.A.
DOI:——
日期:——
Synthesis of Functionalized<i>p</i>-Phenylene Oxide Oligomers
作者:Leyong Wang、Haitao Xi、Xiaoqiang Sun、Yingzhong Shen、Yang Yang、Yi Pan、Hongwen Hu
DOI:10.1080/00397910008087313
日期:2000.1
Oligomers of p-phenylene oxides have been synthesized by coupling of substituted phenols and aryl bromides in the presence of cuprous chloride. The chain length varies from 2 to 5 phenyl rings functionalized at one end by an OH and OMe group and at the other end by an OH, OMe or NO2 functions. The oligomers could be used in material science and as building blocks in supramolecular chemistry. Methods for chemoselective demethylation of methoxy groups were developed.
DINADIC PHENYL AMINE REACTIVE ENDCAPS
申请人:Lubowitz Hyman Ralph
公开号:US20080300374A1
公开(公告)日:2008-12-04
Dinadic phenyl amine reactive endcap monomers for application in high-temperature polymeric composites are described. The amine group of the endcap is directly reacted with a desired chemical backbone to provide the preferred rigidity and chemical resistance. The ability of the amine group to react with a wide variety of chemical backbones allows the tailoring of formulations for various application temperatures, mechanical properties, processes and resistances while retaining the high degree of crosslinking that yields excellent temperature stability, ease of processing and the necessary toughness. Polyimide oligomers comprising the reaction product of at least one dinadic phenyl amine endcap monomer and a chemical backbone, preferably with a molecular weight not exceeding about 1000-3000, suitable for high-temperature composites are described. The dinadic phenyl amine endcaps may be reacted with an acid anhydride capped precursor to form polyimide resins suitable for high-temperature composites.
SINGLE-STEP-PROCESSABLE POLYIMIDES
申请人:Lubowitz Hyman Ralph
公开号:US20080319159A1
公开(公告)日:2008-12-25
A process for synthesizing formulations for polyimides suitable for use in high-temperature composites in which all reactions other than chain-extension have already taken place prior to making a composite is described, wherein the resulting oligomers comprise a backbone and at least one difunctional endcap. The resulting resin systems have only the single step of endcap-to-endcap reactions during composite processing. Prior to the initiation temperature of these endcap-to-endcap reactions, the resins are stable affording the composite manufacturer a very large processing window.