تفاعل #1994296

معادلة التفاعل

4-chloro-2-fluorobenzaldehyde

sodium hydroxide

acetone

dichloromethane

→

4-(4-chloro-2-fluorophenyl)-3-buten-2-one

المردود 76.0%

(E)-4-(4-chloro-2-fluorophenyl)-but-3-en-2-one

المردود 76.0%

المذيبات

water

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONwas added
2. 2
   أخرىThe aqueous layer was separated
3. 3
   استخلاصextracted with CH2Cl2 (100 mL)
4. 4
   غسيلthe combined organic extracts were washed with brine
5. 5
   تجفيفdried over magnesium sulfate (MgSO4)
6. 6
   أخرىSolvent removal
7. 7
   workup.DISTILLATIONfollowed by Kugelrohr distillation

الإجراء التجريبي

To a mechanically stirred solution of 4-chloro-2-fluorobenzaldehyde (23.8 grams (g), 0.15 mole (mol)) in acetone (100 milliliters (mL)) at room temperature was added over 20 minutes (min) a solution of sodium hydroxide (NaOH, 6.6 g, 0.165 mol) in water (H2O, 400 mL). After stirring the reaction mixture overnight, dichloromethane (CH2Cl2, 100 mL) was added. The aqueous layer was separated and extracted with CH2Cl2 (100 mL), and the combined organic extracts were washed with brine and dried over magnesium sulfate (MgSO4). Solvent removal followed by Kugelrohr distillation gave 4-(4-chloro-2-fluorophenyl)-3-buten-2-one (1; 22.5 g, 76%) as a colorless liquid, which solidified upon standing: by 70-80° C., 0.1 mmHg (13.33 pascals (Pa)); 1H NMR (400 MHz, CDCl3) δ 7.59 (d, J=16.5 Hz, 1H), 7.50 (t, J=8.1 Hz, 1H), 7.22-7.12 (m, 2H), 6.76 (d, J=16.5 Hz, 1H), 2.39 (s, 3H); HRMS-ESI (m/z): calcd for C10H8ClFO, 198.024. found 198.025.

المصدر