Benzene → Isovalerophenone

Temperature

0 °C

A mixture of 3-methylbutanoic acid (20.4 g, 0.2 mol), thionyl chloride (35.7 g, 0.3 mol) and DMF (0.5 ml) was heated at reflux for 2 h. The mixture was carefully concentrated in vacuo to give the crude acid chloride. A suspension of anhydrous aluminium chloride (15.4 g, 115 mmol) in dichloromethane (100 ml) was cooled to 0° C. and a solution of the above acid chloride in dichloromethane (50 ml) was added dropwise. The mixture was stirred for 15 min and a solution of benzene (17.9 g, 0.23 mol) in dichloromethane (50 ml) was added dropwise and the resulting mixture stirred at room temperature for 16 h. The reaction mixture was poured into cold 0.05N hydrochloric acid (300 ml) and the resulting mixture extracted with dichloromethane (3×100 ml). The combined organic phases were washed with 1 hydrochloric acid (300 ml), water (300 ml) and saturated sodium hydrogen-carbonate solution (300 ml) and dried (MgSO4). The solvent was evaporated in vacuo to give 21.6 g of 3-methylbutyrophenone.

1. temperaturewas heated
2. temperatureat reflux for 2 h
3. concentrationThe mixture was carefully concentrated in vacuo
4. customto give the crude acid chloride
5. stirringthe resulting mixture stirred at room temperature for 16 h
6. extractionthe resulting mixture extracted with dichloromethane (3×100 ml)
7. washThe combined organic phases were washed with 1 hydrochloric acid (300 ml), water (300 ml) and saturated sodium hydrogen-carbonate solution (300 ml)
8. dry with materialdried (MgSO4)
9. customThe solvent was evaporated in vacuo

ORD record

ord-e927872c0497471c97180761baaa14a5

Source dataset

uspto-grants-1997_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05608069