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(b) One isomer of dimethoxybenzoic acid has 1H NMR spectrum dµ (ppm) 3.85 (6H, s), 6.63 (1H, t, J 2 Hz), and 7.17 (2H, d, J 2Hz), One isomer of coumalic acid has 'H NMR spectrum dн (ppm) 6.41 (1H, d, J 10 Hz), 7.82 (1H, dd, J 2 Hz, 10 Hz) and 8.51 (1H, d, J 2Hz). In each case, which isomer is represented here? The bonds sticking into the centre of the ring can be to any carbon atom. Note: COOH proton is not indicated in the spectra MeO HO₂C CO2H MeO dimethoxybenzoic acid coumalic acid

(b) One isomer of dimethoxybenzoic acid has 1H NMR spectrum dµ (ppm) 3.85 (6H, s), 6.63 (1H, t, J 2 Hz), and 7.17 (2H, d, J 2Hz), One isomer of coumalic acid has 'H NMR spectrum dн (ppm) 6.41 (1H, d, J 10 Hz), 7.82 (1H, dd, J 2 Hz, 10 Hz) and 8.51 (1H, d, J 2Hz). In each case, which isomer is represented here? The bonds sticking into the centre of the ring can be to any carbon atom. Note: COOH proton is not indicated in the spectra MeO HO₂C CO2H MeO dimethoxybenzoic acid coumalic acid

Organic Chemistry
Organic Chemistry
9th Edition
ISBN:9781305080485
Author:John E. McMurry
Publisher:John E. McMurry
Chapter24: Amines And Heterocycles
Section24.SE: Something Extra
Problem 65AP: Phenacetin, a substance formerly used in over-the-counter headache remedies, has the formula...
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(b) One isomer of dimethoxybenzoic acid has 1H NMR spectrum dµ (ppm) 3.85 (6H, s), 6.63 (1H, t, J 2 Hz), and 7.17 (2H, d, J 2Hz), One isomer of coumalic acid has 'H NMR spectrum dн (ppm) 6.41 (1H, d, J 10 Hz), 7.82 (1H, dd, J 2 Hz, 10 Hz) and 8.51 (1H, d, J 2Hz). In each case, which isomer is represented here? The bonds sticking into the centre of the ring can be to any carbon atom. Note: COOH proton is not indicated in the spectra MeO HO₂C CO2H MeO dimethoxybenzoic acid coumalic acid
Transcribed Image Text:(b) One isomer of dimethoxybenzoic acid has 1H NMR spectrum dµ (ppm) 3.85 (6H, s), 6.63 (1H, t, J 2 Hz), and 7.17 (2H, d, J 2Hz), One isomer of coumalic acid has 'H NMR spectrum dн (ppm) 6.41 (1H, d, J 10 Hz), 7.82 (1H, dd, J 2 Hz, 10 Hz) and 8.51 (1H, d, J 2Hz). In each case, which isomer is represented here? The bonds sticking into the centre of the ring can be to any carbon atom. Note: COOH proton is not indicated in the spectra MeO HO₂C CO2H MeO dimethoxybenzoic acid coumalic acid
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