Claims
- 1. A method for making a vinylphosphonic acid diester of the formula
- CH.sub.2 .dbd.CH--P(O)(OR).sub.2
- wherein R is C.sub.1 -C.sub.4 -alkyl, which method comprises heating a dialkyl-2-acetoxyethane-phosphonate of the formula
- CH.sub.3 COOCH.sub.2 CH.sub.2 P(O)(OR).sub.2
- at a temperature from 150.degree. C. to 270.degree. C. in the presence of an acidic or basic catalyst to form a vinylphosphonic acid monoester, and then reacting this monoester with an orthoester of the formula
- R.sup.1 C(OR).sub.3,
- wherein R.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl, or C.sub.1 -C.sub.4 -alkoxy, at a temperature from 30.degree. to 200.degree. C.
- 2. A method as in claim 1 wherein said phosphonate is heated to a temperature from 170.degree. to 230.degree. C.
- 3. A method as in claim 1 wherein said diester is subsequently hydrolyzed by reacting with water at a temperature from 130.degree. to 230.degree. C. while distilling off the alcohol formed thereby.
- 4. A method as in claim 3 wherein said diester is hydrolyzed at a temperature between 140.degree. and 175.degree. C.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3120438 |
May 1981 |
DEX |
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3120437 |
May 1981 |
DEX |
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Parent Case Info
This is a continuation-in-part application of U.S. patent application Ser. No. 380,351 and Ser. No. 380,352 filed May 20, 1983, now both abandoned.
Non-Patent Literature Citations (3)
Entry |
Yamagami et al., "Nippon Kagaka Kaisha," 10, (1972), p. 1991. |
Canavan et al., "Jou. Chem. Soc. (London)," (1962), pp. 331-334. |
Kosolapoff et al., "Organic Phosphorus Compounds," vol. 7, (1977), pp. 10, 11 & 22. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
380351 |
May 1983 |
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