Propylenediamine → HCID 178442810, compound

Temperature

120 °C

In a 500 ml four-necked flask equipped with a reflux condenser and a thermometer were charged 181 g of lauronitrile and 2 g of titanium tetraisopropoxide. Further, 1 g of water was added with stirring and the mixture was heated up to about 120° C. with stirring for 10 minutes. Thereafter, while maintaining the temperature at about 120° C., the mixture was heated for 30 minutes under a reduced pressure to remove isopropanol formed in situ and unreacted water therefrom. After heating the mixture up to 200°-210° C., 74 g of 1,2-diaminopropane were added dropwise for 120 hours with stirring while maintaining the temperature at 200° C. or above. After the addition of the diaminopropane had been completed, the reaction mixture was heated at 210°-220° C. for 4 hours for the completion of the reaction. The resulting mixture was then subjected to vacuum distillation at 1.0 mmHg and at 160°-165° C. to obtain 219 g of 2-undecyl-4-methyl-2-imidazoline with a yield of 92%.

1. customIn a 500 ml four-necked flask equipped with a reflux condenser
2. stirringwith stirring for 10 minutes
3. temperatureThereafter, while maintaining the temperature at about 120° C.
4. temperaturethe mixture was heated for 30 minutes under a reduced pressure
5. customto remove isopropanol
6. customformed in situ and unreacted water
7. additionwere added dropwise for 120 hours
8. stirringwith stirring
9. temperaturewhile maintaining the temperature at 200° C. or above
10. temperaturethe reaction mixture was heated at 210°-220° C. for 4 hours for the completion of the reaction
11. distillationThe resulting mixture was then subjected to vacuum distillation at 1.0 mmHg and at 160°-165° C.

ORD record

ord-7a868f2ff6884e23b6fd0c56e463d828

Source dataset

uspto-grants-1995_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05380899