Vier‐ und fünfgliedrige Phosphorheterocyclen, 521) Pentacyclische Diphosphorane aus der Reaktion 2H‐1, 2, 4, 3λ3‐Triazaphosphol/Azodicarbonester

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Abstract
Four‐ and Five‐membered Phosphorus Heterocycles, 521) Pentacyclic Diphosphoranes from the Reaction 2H‐1, 2, 4, 3λ3‐Triazaphosphole/Azodicarboxylic EstersAzodicarboxylic ester react with 2‐methyl‐5‐phenyl‐2H‐1, 2, 4, 3λ3‐triazaphosphole (1) as heterodienes in an oxidative [4 + 1] cycloaddition at the σ2‐phosphorus and a concomitant [2 + 2] dimerization of the supposed intermediate spirocyclic phosphazene 3. The resulting diphosphoranes 4 may also be synthesized from the dichlorotriazaphosphole dimer 5 and hydrazinedicarboxylic esters 6.