The carboxylic chlorides (I) or ketene (VIII) are coupled with the phosphites (II), (IV), (VI), or (IX) to give the phosphonates (III), (V), (VII), or (X) which have fungicidal activity.
Setzt man Diäthylchlorphosphit (I) in Äther mit Acrylsäure (II) bei 20°C um und arbeitet das Reaktionsgemisch entweder mit Alkohol/Triäthylamin oder mit Triäthylphosphit (VI) auf, dann erhält man im ersten Fall die Verbindung (V), im anderen Fall die Verbindung (VII).
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