تفاعل #1994220

معادلة التفاعل

calcium hydroxide

2,4-dimethylbenzoic acid

sulfuric acid

ethanol

→

1

المردود 95.0%

Ethyl 2,4-Dimethylbenzoate

المردود 95.0%

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةThe mixture was refluxed over night
2. 2
   درجة الحرارةcooled down
3. 3
   ترشيحThe suspension was filtered over celite and
4. 4
   تركيزconcentrated in vacuo
5. 5
   workup.DISTILLATIONThe crude product was purified by vacuum distillation

الإجراء التجريبي

To a solution of commercially available 2,4-dimethylbenzoic acid (67.8 g, 451 mmol) in 1000 mL of ethanol was added 10 mL of sulfuric acid. The mixture was refluxed over night, cooled down and was neutralized by adding calcium hydroxide in small portions (˜30 g). The suspension was filtered over celite and concentrated in vacuo. The crude product was purified by vacuum distillation yielding 76.4 g (95%) of 1 as a colorless oil: 1H-NMR (400 MHz, CDCl3): δ 1.38 (t, J=7.3 Hz, 3H), 2.34 (s, 3H), 2.57 (s, 3H), 4.33 (q, J=7.2 Hz, 2H), 7.01-7.06 (m, 2H), 7.82 (d, J=8.5 Hz, 1H); 13C-NMR (100 MHz, CDCl3): δ 14.3, 21.3, 21.7, 60.4, 126.3, 126.9, 130.7, 132.4, 140.1, 142.3, 167.6; MS (ESI) m/z=133.0 (100), 132.0 (57), 178.1 (M+, 51).

المصدر