Back to results
US 5,969,199 AGranted
Process for the addition of HF to halogenated alkenes
AssigneeSolvay SA
InventorsRaimund Franz, Gunter Siegemund
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for the addition of HF to halogenated alkenes by reacting these with at least one hydrofluoride of the formula [B.cndot.n HF], in which B is an organic nitrogen base and n is an integer or fraction .ltoreq.4, it being intended that the reaction of perfluoroiso-butene CF.sub.2 =C(CF.sub.3).sub.2 is excluded.
Claims32
A process for the addition of HF to a halogenated alkene of the formula (I)
- R.sup.1 CF=CR.sup.2 R.sup.3 (I)
- in which R.sup.1 to R.sup.3 have the following meaning:
- R.sup.1 =F, CF.sub.3 or CF.sub.2 R.sup.4, where R.sup.4 =C.sub.1 -C.sub.4 -alkyl, unsubstituted or substituted by one or more halogen atoms,
- R.sup.2 =H, halogen or CF.sub.3,
- R.sup.3 =H, F, CF.sub.3 or C.sub.1 -C.sub.4 -alkyl, unsubstituted or substituted by one or more halogen atoms, which comprises
- (a) preparing at least one hydrofluoride of an organic nitrogen base of the formula (II)
- {B.cndot.n HF} (II)
- in which B is an organic nitrogen base and n is an integer or fraction .ltoreq.4, by reaction of the organic base B with HF;
- and
- (b) reacting the halogenated alkene of the formula (I) with said hydrofluoride, wherein formula (I) is not CF.sub.2 =C(CF.sub.3).sub.2.
7 more elements
A process for the hydrofluorination of a halogenated alkene wherein said halogenated alkene is ##STR4## said process comprising:
- (a) hydrofluorinating said halogenated alkene essentially by reaction with at least one hydrofluoride of an organic nitrogen base of the formula (II)
- {B.cndot.nHF} (II)
- in which B is a tertiary organic nitrogen base having a total of 3 to 12 carbon atoms and n is a number .ltoreq.4, and
- (b) isolating essentially only the hydrofluorinated addition product having the halogen atoms of said halogenated alkene and, in addition, an additional F atom and an additional H atom.
1 more element
A process for the addition of HF to a halogenated alkene of the formula (I)
- R.sup.1 CF=CR.sup.2 R.sup.3 (I)
- in which R.sup.1 to R.sup.3 have the following meaning:
- R.sup.1 =F, CF.sub.3 or CF.sub.2 R.sup.4, where R.sup.4 =C.sub.1 -C.sub.4 -alkyl, unsubstituted or substituted by one or more halogen atoms,
- R.sup.2 =H, halogen or CF.sub.3,
- R.sup.3 =H, F, CF.sub.3 or C.sub.1 -C.sub.4 -alkyl, unsubstituted or substituted by one or more halogen atoms, which comprises
- (a) preparing at least one hydrofluoride of an organic nitrogen base of the formula (II)
- {B.cndot.n HF} (II)
- in which B is an organic nitrogen base and n is an integer or fraction .ltoreq.4, by reaction of the organic base B with HF;
- and
- (b) reacting the halogenated alkene of the formula (I) in the substantial absence of free hydrogen fluoride with said hydrofluoride, wherein formula (I) is not CF.sub.2 =C(CF.sub.3).sub.2.
7 more elements
Dependencies are inferred from the claim text.