Reaktion #2186181

Reaktionsgleichung

compound ( b44 )

1-chloro-3-ethoxy-2-fluorobenzene

bromine

→

1-bromo-2-chloro-4-ethoxy-3-fluorobenzene

Ausbeute 87.9%

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added dropwise over 1 hour in a temperature range of 20 to 40° C.
2. 2
   SonstigeThe resulting reaction mixture
3. 3
   Waschenwas washed with a saturated sodium thiosulfate aqueous solution
4. 4
   workup.DISTILLATIONThe residue was subjected to fractional distillation under reduced pressure

Vorschrift

504 g of the compound (b44) was added to a reactor in a nitrogen atmosphere, to which 434 g of bromine was added dropwise over 1 hour in a temperature range of 20 to 40° C., followed by stirring for 30 minutes. The resulting reaction mixture was washed with a saturated sodium thiosulfate aqueous solution, a 10% sodium hydroxide aqueous solution, and water. The residue was subjected to fractional distillation under reduced pressure to obtain 605 g of 1-bromo-2-chloro-4-ethoxy-3-fluorobenzene (C12). The resulting compound (C12) was white solid and had a melting point of 48.0 to 48.5° C. and a boiling point of 88 to 90° C./1 mmHg.

Quelle