Claims
- 1. A process for the preparation of vinylphosphonic acid dichloride and 2-chloroethanephosphonic acid dichloride which consists essentially of heating a 2-chloroethanephosphonic compound containing 2-chloroethyl ester groups to 150.degree.-230.degree. C. in a first step, with cleavage of dichloroethane and formation of a vinylphosphonic compound as a reaction product of said first step, and in a second step, reacting the said reaction product with phosgene at 90.degree.-200.degree. C., in the presence of a basic catalyst, or of an alkali metal salt as catalyst, and in the presence of a phosphonic acid dichloride.
- 2. A process as claimed in claim 1, wherein the reaction is carried out in the first step in the presence of an acid or basic catalyst.
- 3. A process as claimed in claim 1, wherein the reaction is carried out in the first step at 170.degree. to 215.degree. C. and in the 2nd step at 120.degree. to 170.degree. C.
- 4. A process as claimed in claim 1, wherein the reaction is carried out in the second step in the presence of a mixture of vinylphosphonic acid dichloride and 2-chloroethanephosphonic acid dichloride.
- 5. A process according to claim 1 wherein said first step is carried out with formation of a mixture of vinylphosphonic acid compounds as reaction products of said first stage, and, in a second step, reacting this mixture with phosgene at 90.degree.-200.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3033614 |
Sep 1980 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 297,734 filed Aug. 31, 1981, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3950413 |
Finke et al. |
Apr 1976 |
|
4013715 |
Finke et al. |
Mar 1977 |
|
4069247 |
Kleiner |
Jan 1978 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
297734 |
Aug 1981 |
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