Sodium Fluoride → 2,4,6-Trichloro-5-fluoropyrimidine

0.5 mol of fluorine in the form of a 30% by volume mixture with helium was introduced into a suspension of 36.7 g (0.2 mol) of 2,4,6-trichloropyrimidine, 21 g of sodium fluoride (0.5 mol) and 250 ml of trichlorofluoromethane, at a temperature of -78° C. The rate of introduction was 0.15 mol of fluorine per hour. After the introduction, the reaction mixture was filtered and 19.3 g of pure 5-fluoro-2,4,6-trichloropyrimidine were obtained from the filtrate by distillation over iron filings. This corresponds to a yield of 48% of theory. The boiling point of the isolated product was 80°-87° C. at 10 mbar. The reaction mixture also contained more highly fluorinated pyrimidine derivatives.

1. filtrationAfter the introduction, the reaction mixture was filtered

ORD record

ord-d0b214783d1d42c189fbe9d14cd04a5e

Source dataset

uspto-grants-1992_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05145961