Benzophenone-2,4-dicarboxylic acid

Cheng LP, Dwan AH, and Gryte CC. Wholly aromatic thermotropic liquid crystalline polyesters of 4,4 -biphenol, substituted biphenols, and l,l -binaphthyl-4,4 -diol with 3,4 -benzophenone dicarboxylic acid. J. Polym. Sci. Polym. Phys. B 1995 33 211-225. 

The dual-mechanism approach of McCaig and co-workers described above was able to describe the oxygen permeability decay in bisphenol. A benzophenone-dicarboxylic acid (BPA-BnzDCA) films of varying thickness remarkably well. This data is illustrated in Figure 35. All films, regardless of thickness, experience an initial sharp decline in permeability. This drop is due to the lattice-contraction mechanism, which is independent of sample dimension. Only in the thin films where the half-thickness i was less than 2.5 /u,m was a contribution from the free-volume diffusion mechanism observed. 

Reactions of 4,7-phenanthroline-5,6-dione have been the subject of considerable study. It is reduced to 5,6-dihydroxy-4,7-phenanthroline by Raney nickel hydrogenation226,249 or by aromatic thiols in benzene,262 and oxidized by permanganate to 3,3 -bipyridyl-2,2 -dicarboxylic acid.263 It forms bishemiketals with alcohols226 and diepoxides with diazomethane.226 The diepoxides by reaction with hydrochloric acid form diols of type 57, R = Cl, which on oxidation with lead tetraacetate give 3,3 -bipyridyl diketones of type 58, R = Cl. Methyl ketones of type 58, R = H, are also obtained by lead(IV) acetate oxidation of the diol 57, R = H, obtained by lithium aluminum hydride reduction of 57, R = Cl. With phenyldiazomethane and diphenyldiazomethane the dione forms 1,3-dioxole derivatives,264,265 which readily hydrolyze back to the dione with concomitant formation of benzaldehyde and benzophenone, respectively. 

Sulfur tetrafluoride fluorination of aryl perfluoroalkyl esters provides a route to stable aryl perfluoroalkyl ether compounds (1). By using nitrophenyl esters of perfluoroalkyl-ene and perfluoroalkylene ether dicarboxylic acids, a, w-bis (m-nitrophenoxy) perfluoroalkylene ether intermediates were prepared. The conversion of these products to the corresponding amino and isocyanatophenoxy derivatives is described. Reaction of the diamines with benzophenone-tetracarboxylic dianhydride resulted in formation of poly-imides. Cyclotrimerization of the diisocyanate intermediates formed polyisocyanurates. Both the imide and iso-cyanurate polymers have high thermal, oxidative, and hydrolytic stability. 

Cyanuryi chioride. See Cyanuric chloride Cyasorb UV 9. See Benzophenone-3 Cyasorb UV 24. See Benzophenone-8 Cyasorb UV416. See 2-Hydroxy-4-acryioyioxyethoxy benzophenone Cyasorb UV 500. See 1,5-Dioxaspiro [5.5] undecane 3,3-dicarboxylic acid, bis (2,2,6,6-tetramethyi-4-piperidinyl) ester Cyasorb UV 531. See Benzophenone-12 Cyasorb UV 1084. See 2,2 -Thiobis (4-t-octylphenolato)-n-butylamine nickel Cyasorb UV 1164. See 2-[4,6-Bis (2,4-dimethylphenyl)-1,3,5-triazin-2-yl1-5-(octyloxy) phenol... 

Benzophenone-3 Bis [2-hydroxy-5-methyl-3-(benzotriazol-2-yl) phenyl] methane 1,5-Dioxaspiro [5.5] undecane 3,3-dicarboxylic acid, bis (2,2,6,6-tetramethyl-4-piperidinyl) ester 4-Dodecyloxy-2-hydroxybenzophenone Drometrizoie... 

PMR-I (PMR 15, PMR30, PMR 50) Monomethyl ester of 5-norbornene-2,3 dicarboxylic acid (Nadic ester), dimethyl ester of 3,3, 4,4 -benzophenone tetracarbo xylic acid dianhydride (BTDA) and 4,4 -methylene dianiline Mole ratio 2 2.087 3.087 Nadic 340(395)1316 [144-146]... 

Typical procedure. 4,4 -Bis(4-ethoxycarbony benzy ) benzophenone 1250 with phosgene [936] A mixture of ethyl 4-benzylbenzoate 1249 (50 g) and powdered anhydrous aluminum chloride (80 g) in carbon disulfide (500 mL) was cooled to —15 °C, and then phosgene (10 g) was slowly stirred into the mixture at a temperature below —10 °C. The temperature was then allowed to rise slowly to ambient. After standard work-up, 44 g of the keto diester 1250 was obtained as a pale-yellow powder. This powder was used without further purification for the preparation of the corresponding dicarboxylic acid. 

A mixture of 48 g (0.10 mol) of benzophenone-4,4 -dibenzoyl-3,3 -dicarboxylic acid and 140 mL of thionyl chloride was heated at reflux for 4 hrs. The excess thionyl chloride was removed by distillation, and the residue was dried under vacuum to give 51 g of the pseudoacid chloride. 

A 3D framework based on coplanar [Co s] units was isolated under hydrothermal conditions from the reaction of Co(N03)2 6H20, benzophenone-2,4 -dicarboxylic acid (H2bpdc), l,4-diazabicyclo[2,2,2] octane (dabco), and KOH in H2O.44 [Co5(p3-OH)2(bpdc)4(dabco)(H20)2]... 

An investigation of several phenyl-substituted oxetanes and of rrani-diethyl oxetane-2,3-dicarboxylate has been carried out in hot solutions rather than in the gas phase. The solvents must, of course, be high boiling and completely free of any acidic impurities, which would cause an acid-catalyzed decomposition. 2,2-Diphenyl-3,3,4,4-tetramethyloxetane (27) pyrolyzed at 310 °C at practically the same rate in each of three solvents of quite different polarity — diphenyl ether, DMF and TMEDA — showing that the intermediate is relatively non-polar. High regioselectivity is shown in this reaction, which gave mainly benzophenone... 

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