| 摘要 |
Some at least of the bromine atoms in a compound AB (as defined below) are replaced by fluorine by treating AB with BrF3 plus liquid bromine at a temperature not above 60 DEG C.; A is C1- 5 aliphatic residue containing at least one bromine atom, the remaining substituents being H, F or Cl; and B is H. Cl, NO2, CN, COF, CHO, -OCOR, -COOR, -OR or -COR, where R is C1- 3 alkyl. Examples prepare (1) CF2Br.CHBrF or CF3.CHBrF from CF2Br.CHBr2; (2) CH3.CHBrF from CF3.CHBr2; CF3.CH2F from CF3.CH2Br; CF3.CHBrF and CF3.CHF3 from CHBrF.CBr2F; CHF2.CHBr2 and CHBrF.CHBr2 from CHBr2.CHBr2; (3) CH2F. CH2F from CH2Br.CH2Br; (4) CH3.CH2F from CH3.CH2Br; (5) CHClF.CHClF from CHBrCl.CHBrCl; (6) CF2Cl (CH2)4F from CF2Cl(CH2)4Br; (7) CH3OCF2.CHBrF and CH3OCF2.CHF2 from CH3OCF2.CHBr2; (8), (9) CF2Br.NO2 and CFBr2.NO2 from CBr3.NO2; (10) CHBrF.COOCH3 from CHBr2.COOCH3. Other starting materials are listed.
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