The [4+2] cycloadducts between furan compounds and a methylenechlorophosphane pentacarbonyltungsten complex are converted into the corresponding 2‐hydroxy‐ or 2‐bromophosphinine complexes by treatment with BBr3 and triethylamine. The X‐ray crystal structure of the parent 2‐phosphaphenol complex shows that the hydroxy substituent is coplanar with the ring and that the conjugation between the π lone