Ultraviolet spectra of some nitrobenzofurans and some nitrocumarilic acids was written by Andrisano, Renato;Duro, Francesco;Pappalardo, Giovanni. And the article was included in Gazzetta Chimica Italiana in 1956.Name: Methyl benzofuran-2-carboxylate This article mentions the following:
Spectra of benzofuran derivatives (wave length of maxima in A. and ε values in parentheses): 2-NO2, 2240 (4.31), 2965 (4.02), 3350 (3.92); 4-NO2 (I), m. 99-100°, 2160 (3.60), 3240 (3.97); 5-NO2, 2380 (4.43), 2820 (3.83); 6-NO2, 2235 (4.08), 3055 (4.03); 7-NO2, 2200 (4.11); 2980 (3.87). Derivatives of coumarilic acid: 4-NO2 (II), m. 243-4°, 2400 (4.18), 3085 (3.87), 3400 (3.89); 5-NO2, 2250 (4.57), 2990 (barely perceptible shoulder (III)) (3.84); 6-NO2, 2140 (4.21), 2270 (4.13), 3130 (4.17); 7-NO2, 2520 (4.47), 2910 (III) (3.84). Me cumarilate (IV): 2180 (3.94); 2730 (4.28); derivatives of (IV): 4-NO2, m. 162-3°, 2420 (4.13), 3080 (4.02), 3240 (4.01); 5-NO2, m. 164-5°, 2560 (4.54), 2950 (III) (3.70); 6-NO2, m. 147-8°, 2140 (4.15), 2260 (4.10), 2990 (4.25); 7-NO2, m. 164-5°, 2250 (4.51), 2950 (III) (3.69). II is prepared in 42% yield by adding 0.2 mole salicylaldehyde in 100 ml. MeCOEt to 0.26 mole BrCH(CO2Et)2 and 0.3 mole K2CO3, refluxing 5 hrs., evaporating most solvent, dissolving the residue in H2O, acidifying with H2SO4, extracting with Et2O, evaporating the solvent, refluxing the residue 1 hr. with 10% alc. KOH, evaporating the alc., dissolving the residue in H2O, acidifying with H2SO4, dissolving the precipitate in dilute NH3, filtering, and acidifying the filtrate. I is prepared in 85% yield by refluxing 0.1 mole II in 100 ml. quinoline 1.5 hr. with 1.5 g. powd. Cu, diluting with Et2O, filtering, washing with 2N HCl and H2O, evaporating the solvent, and crystallizing the residue or subliming it in vacuo. IV and derivatives are prepared in 89-95% yield by dissolving the acids in MeOH, saturating the solution with HCl in the cold, refluxing 0.5 hr., adding to H2O, extracting with Et2O, and evaporating the solvent. In the experiment, the researchers used many compounds, for example, Methyl benzofuran-2-carboxylate (cas: 1646-27-1Name: Methyl benzofuran-2-carboxylate).
Methyl benzofuran-2-carboxylate (cas: 1646-27-1) belongs to benzofurans derivatives.Benzofuran is one of the most significant oxygen-containing heterocycles consisting of fused benzene and furan ring, which are widely presented in various naturally occurring and synthetically active compounds. Benzofurans are stable towards alkali and readily polymerize on treatment with sulfuric acid, due to which they are useful for the preparation of low cost chemically relatively inert resins.Name: Methyl benzofuran-2-carboxylate
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem