2‐Phenoxy‐4,4‐dimethyltetrahydro‐2H‐1,3,4,2‐oxadiazaphosphorinium 2‐oxide inner salt, the first known cyclic phosphaminimide, was synthesized by dehydroiodination of its hydrazinium salt. The corresponding 2‐phenyl derivative was unstable and not isolated. The 2‐phenoxy and 2‐phenylphosphorinium iodides and their precursors produced weak inhibition of sympathetic ganglionic transmission. The phosphaminimide caused a slight potentiation and was also found to be less toxic than its corresponding hydrazinium iodide precusor.
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