N,N-Dimethylaniline → HCID 19785983, compound

A solution of 3,4-dichlorobenzylchloride (49.2 g, 0.254 mole) in dry ether (125 ml) was added dropwise during one hour to magnesium (6.08 g, 0.250 mole) in a three-necked flask equipped with stirrer and reflux condenser. Refluxing was continued until all the magnesium was dissolved and the solution was then cooled. Acetone (15.0 g, 0.258 mole) was added dropwise and the solution heated to reflux for three hours. After cooling the reaction mixture was poured out on ice (125 ml) and a concentrated hydrochloric acid (23 ml). The phases were separated and the organic layer was washed with water, dried (Na2SO4) and evaporated in vacuum. The residual oil was distilled affording 1-(3,4-dichlorophenyl)-2-methyl-2-propanol (bp. 81°-83° C./0.2 mm Hg; 31.3 g, 57% yield). After several recrystallizations from petroleum ether the compound melted at 40°-41° C. The substituted propanol above (21.9 g, 0.100 mole) was mixed with dimethylaniline (12.4 g, 0.102 mole) and ether (50 ml). The solution was cooled and α-bromopropionyl bromide (21.4 g, 0.099 mole) was added dropwise during 40 minutes. Stirring at room temperature for 48 hours gave a crystalline precipitate of dimethylaniline hydrobromide, which was filtered off and washed with ether. The etheral solutions were combined and evaporated in vacuo. The residual oil was distilled affording 2-bromopropanoic acid 1-(3,4-dichlorophenyl)-2-methyl-2-propolyester (bp. 135°-143° C./0.2 mm Hg; 19.2 g, 55% yield).

1. customAfter several recrystallizations from petroleum ether the compound melted at 40°-41° C
2. temperatureThe solution was cooled

ORD record

ord-47bfe4ce0cfd49009fd06f992f4ec2ce

Source dataset

uspto-grants-1982_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04331684