PRODUCTION OF 2-CHLOROFORMYLETHYLMETHYL-PHOSPHINIC ACID CHLORIDES

PRODUCTION OF 2-CHLOROFORMYLETHYLMETHYL-PHOSPHINIC ACID CHLORIDES

PRODUCTION OF 2-CHLOROFORMYLETHYLMETHYL- PHOSPHINIC ACID CHLORIDES The invention relates to a process for making 2-chloroformylethylmethylphosphinic acid chlorides of the general formula: in which R1 and R2 each stand for hydrogen or CH3. To this end, methyldichlorophosphane is reacted with acrylic...

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Bibliographische Detailangaben
Hauptverfasser: GEHRMANN, KLAUS, NEUMAIER, HUBERT, OHORODNIK, ALEXANDER
Format: Patent
Sprache:eng ; fre
Schlagworte:
ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:PRODUCTION OF 2-CHLOROFORMYLETHYLMETHYL- PHOSPHINIC ACID CHLORIDES The invention relates to a process for making 2-chloroformylethylmethylphosphinic acid chlorides of the general formula: in which R1 and R2 each stand for hydrogen or CH3. To this end, methyldichlorophosphane is reacted with acrylic acid, methacrylic acid or crotonic acid at elevated temperature. More particularly, a solution of methyldichlorophosphane in phosphorus trichloride, the solution originating from a reaction of phosphorus trichloride with methane at temperatures higher than 500.degree. C, is used. The reaction is effected at temperatures within the range 50 to 90.degree. C in the presence of hydrogen chloride; and the phosphorus trichloride is distilled off.