Biphenyl 2,2 dicarboxylate

Condensation of Biphenyl-2,2 -dicarboxylic Anhydride with Hydrazines... 

Hydrazine or its substituted derivatives react with biphenyl-2,2 -dicarboxylic anhydride (1) to provide 1,2-diazocinedione derivatives 2.13 1S... 

Biphenyl-2,2 -dicarboxylate was formed by Ph. chrysosporium in a reaction mixture with manganese peroxidase, Oj, and unsaturated lipid, and it was suggested that a MnP-mediated lipid peroxidation was involved (Moen and Hammel 1994). 

Experiment 6.9 BIPHENYL-2,2 -DICARBOXYLIC ACID (Diphenic acid)... 

Experiment 6.151 DIPHENIC ACID (Biphenyl-2,2 -dicarboxylic acid)... 

Biphenyl-2,2 -dicarboxylic acids are oxidatively converted into benzocoumarins with loss of carbon dioxide. A more predictable reaction of a dicarboxylic acid occurs on heating with sodium acetate-acetic anhydride C-acetylation first occurs and decarboxylative lactonization follows, but in low yield. 

Epoxidation. Hoft and Ganschow report that this reagent converts olefins into epoxides, Schiff bases into oxaziridines, and tertiary amines into N-oxides. Epoxidation can be performed more simply by addition of benzoyl isocyanate to a solution of the alkene in THF containing excess anhydrous H2O2 and a trace of a radical inhibitor. Under these conditions phenanthrene is converted at 25° into biphenyl-2,2 -dicarboxylic acid. 

Dimethyl 4,4 -dimethoxy-5,6 5, 6 -bis(methylenedioxy)biphenyl-2,2 -dicarboxylate, in H-10051 Luteolin 4 -0-a-L-Arabinoside, in T-10052 Luteohn 3 -0-jff-D-Xylopyranoside, in T-10052... 

The melting temperatures and thermal stabilities of several polybenzimidazoles are shown in TABLE I. For all aromatic polybenzimidazoies, melting points are over 600 C. Generally, the presence of other structural elements will reduce melting points and thermal stabilities. For example, TABLE I includes polybenzimidazoles condensed from either a tetraamine ether or a diacid ether. Strained polymer structures also reduce polybenzimidazole stability as evidenced by the low melting point of a polymer formed with a biphenyl-2,2 -dicarboxylate. Not surprisingly, the aliphatic, adipic acid forms a much less stable polybenzimidazole than the aromatic examples above it in the table. 

C24H14F16 O4 biphenyl-2,2 -dicarboxylic acid bis-(lH,lH-octafluoro-pentyl) ester 438-63-1... 

A convenient synthesis of biphenyl-2,2 -dicarboxylic acids and of 2 -cyano-biphenyl-2-carboxylic acids has been reported yields for twelve examples in all are between 74% and quantitative. The synthesis and reactions of 2-(4-hydroxy-3-isopropylbenzoyl)benzoic acid have been studied. ... 

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