Benzo furan-3-carboxylic acids

Benzo[b]furan-2-carboxylic acid, 3,6-dimethoxy-, methyl ester UV, 4, 589 <71AJC1883> Benzo[b]furan-2-carboxylic acid, 5,6-dimethyl-, methyl ester... [Pg.8]

H NMR, 4, 561 <65MI31002> Benzo[b]furan-2-carboxylic acid, methyl ester UV, 4, 589 Benzo[b]furan-3-carboxylic acid, 6-chloro-4,5,7-trifluoro-2-methyl-, ethyl ester C NMR, 4, 568 <72JCS(P2)1733> Benzo[b]furan-3-carboxylic acid, 6-cyano-4,5,7-trifluoro-2-methyl-, ethyl ester C NMR, 4, 568 <72JCS(P2)1733>, 569 <72JCS(P2)1733>... [Pg.8]

F NMR, 4, 569 <72JCS(P2)1733> Benzo[b]furan-3-carboxylic acid, 2-methyl-, methyl ester... [Pg.8]

H NMR, 4, 561 <720MR(4)343> Benzo[b]furan-4-carboxylic acid, methyl ester UV, 4, 589 (73AJC1059)... [Pg.8]

Benzo[6]furan-2-carboxylic acid, 5-acyl-2,3-dihydro-applications, 4, 708... [Pg.548]

Benzo[b]furan-2-carboxylic acid, 6,6 -[(2-hydroxy-l,3-propanediyl)bis(oxy)]bis(3-hydroxy-diethyl ester trisodium salt trihydrate applications, 4, 709... [Pg.548]

Benzo[b]furan-3-carboxylic acid, 2-amino-esters... [Pg.548]

C- F coupling constants, 4, 569 Benzo[b]furan-5-carboxylic acid, 4-hydroxy-2-isopropyl-synthesis, 3, 698... [Pg.548]

Benzo[b]furan-2-carboxylic acids bromination, 4, 602 chloromethylation, 4, 602 from coumarins, 3, 686 IR spectra, 4, 590 methyl ester... [Pg.548]

Benzo[b]furan-3-carboxylic acids methyl esters, 4, 646 Benzofuranofurans H NMR, 4, 572 5-Benzo[ b]furanol esters... [Pg.548]

Electron-withdrawing substituents seem to stabilize the benzo[cjfuran system as they do in the analogous benzo[c]thiophene and benzo [c]indole series. l-Cyano-3-phenylbenzo[c]furan (128) was obtained from the aldehyde 127 as stable yellow needles hydrolysis with base yields the carboxylic acid (129). Catalyzed hydrogenation of these cornpounds leads to 1,3-dihydrobenzo[c]furans (130, R = CH2NH2, COOH = Ph). Increased... [Pg.160]

Furan is resinified by sulfuric acid but it can be sulfonated with the complex of sulfur trioxide with pyridine or dioxane. Depending on conditions the 2-sulfonic or the 2,5-disulfonic acid may be obtained. Furan-2-carboxylic acid can be sulfonated with oleum. Benzo[6]furan is polymerized by sulfuric acid. The 2-sulfonic acid has been obtained by oxidation of the sulfinic acid available in turn by treatment of the lithio derivative with sulfur dioxide. Benzo[6]furan with the sulfur trioxide-pyridine complex allegedly affords the 3-sulfonic acid. [Pg.604]

Phenylbenzo[c ]furan-3-carbonitrile and the corresponding carboxylic acid are catalyti-cally reduced in a cis manner to the expected 1,3-dihydro compounds. 1,3-Diaryl-benzo[c]furans are also reduced to phthalans with sodium amalgam. [Pg.614]

Electron withdrawing substituents stabilize the benzo[c]furan system. l-Cyano-3-phenyl-benzo[c]furan (247) can be obtained from the benzophenone (246) (70TL707) as a crystalline solid. The carboxylic acid (248) could be isolated on base catalyzed hydrolysis of (247), while catalytic hydrogenation led to the l,3-dihydrobenzo[c]furans (249). [Pg.683]

Benzo[h]furan-2-carboxylic acid, 2-amino-tautomerism, 4, 648... [Pg.548]

Crounse and Desai29 showed further that 2-(/>-tolyl)benzo[6]furan with Schiff s base derived from terephthalaldehydic acid and aniline gives, on treatment with excess potassium r-butoxide, the corresponding stilbene carboxylic acid. Schiff s base derived from phthalaldehydic acid and aniline exists30 as the 3-anilinophthalide (40). Nevertheless, this also reacts similarly with, for example, the naphthofuran (39) to form 2-(2 -carboxystilben-4-yl)naphtho [ 1,2-6]furan (41).29 Analogous car-... [Pg.187]

Benzo[, ]furan 82 with sodium sand in the presence of 1-chlorooctane gave the 2-sodium salt of benzo[, ]furan, which with CO2 gave the carboxylic acid 93 (Equation 87) <2002AGE340>. [Pg.445]

Copper-mediated decarboxylation was observed to convert benzo [. ]furan-2-carboxylic acid into its corresponding benzoMfuran, albeit in low yield (Equation 174) <2002EJ01937>. [Pg.480]

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