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Dialkylmonofluorophosphites react with PCI 3  or PBr 3  to yield the title compounds 6 and 7. These reactions take place only in the presence of protic catalysts. As a working hypothesis, it is assumed that phosphorus is quinquevalent in the transition state. The  31 P and  11 F NMR data are tabulated.

Protonenkatalysierte Synthese von Fluorochloro- und Fluorobromophosphiten / Synthesis of Fluorochloro- and Fluorobromophosphites by Proton Catalysis