4,4 -Dicarboxydiphenyl ether

Nanocomposites from (poly[2,2 -(p-oxidiphen-ylene)-5,5 -bibenzimidazole]) and polyhedral oligomeric silsesquioxane (POSS) with a pendant phenyl group have been prepared by an in situ polymerization of 4,4 -dicarboxydiphenyl ether and 3,3 -diaminobenzidine in the presence of POSS [21]. The PBI chains were successfully attached to the phenyl group of the POSS by aFriedel-Crafls reaction. 

More extreme corrugation of sheets can lead to 2D 3D parallel interpenetration. Again, in this mode, the mean planes of the interpenetrating sheets are all parallel, but now they are no longer coincident (as they often are for 2D entanglements). The structure of [Cu(dde)(bpe)].H20, dde = 4,4 -dicarboxydiphenyl ether, bpe = 1,2-bis(4-pyridyl)ethene typifies this interpenetration... 

In some special cases, Ueda s approach is more useful for PBI synthesis. For example, the authors found that the copolymerization of disodium 4,6-fcis(4-carboxyphenoxy) benzene-l,3-disulfonate (BCPOBDS-Na), 4,4 -dicarboxydiphenyl ether (DCDPE), and 3,3 -diaminobenzidine (DABz) in Eaton s reagent at IdO C yielded organo soluble linear sulfonated polybenzimidazoles (SOPBIs) [7], whereas insoluble gel was obtained when the polymerization was conducted in PPA probably because of the occurrence of cross-linking reactions between sulfonate groups and activated benzene rings. 

Phaeanthine, C3JH42O0N2. (Item 8 list, p. 350.) This alkaloid was isolated by Santos.It has m.p. 210°, [a]u°° — 278° (CHCI3), yields a hydriodide, m.p. 268°, picrate, m.p. 263°, aurichloride, m.p. 170-1°, and a platinichloride, m.p. 280° (dec.), and contains four methoxyl and two methylimino groups. By the Hofmann degradation process it yields an optically inactive methine base A, m.p. 173°, which is oxidised by potassium permanganate in acetone to 2-methoxy-5 4 -dicarboxydiphenyl ether (p. 348). A comparison of the properties of phseanthine and tetrandrine by Kondo and Keimatsu indicates that these two alkaloids are optical antipodes, so that phseanthine will be represented by either (XXXIX) or (XL) as given on p. 348, 1 and of these two formula (R = Me) one must represent oxyacanthine methyl ether and the other berbamine methyl ether (centres of asymmetry d- and 1-) tetrandrine (centres of asymmetry both d-) and phseanthine (centres of asymmetry both 1-). 

N-Methylation (CH20 followed by reduction with NaBH4) transformed codonocarpine (104) to its methyl derivative (105). Acid-catalyzed hydrolysis of 104 gave spermidine. The permethylated alkaloid was oxidized with KMn04 to 2,2 -dicarboxydiphenyl ether (106), which was also synthesized. 

The structure of the diphenyl ether moiety of 0-methylthalicberine was determined by degradation. 0-Methylthalicberine dimethochloride was converted through the Hofmann elimination reaction to a methine base (CVII) which was oxidized with permanganate to an acid identified as 2-methoxy-5,4 -dicarboxydiphenyl ether (XVIII) (81). 

Substituted toluenes Mn(III) Dicarboxydiphenyl sulphone Dicarboxyphenyl ether Tolualdehyde... 

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