Abstract
Silica gel was employed to react with the suspected metaphosphate intermediate of the acid-promoted cleavage of monoalkyl α-(oxyimino)benzylphosphonates. The silica gels displayed CP-MAS 31P NMR signals at about δ −8. A similar value was obtained for silica gel phosphorylated with ethyl metaphosphate from a different source (thermolysis of a P-ethoxy 2,3-oxaphosphabicyclo[2.2.2]octene derivative.
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