DBU ‐ nicht einfach nur eine starke Base: Eine Eintopfreaktion für ein polycyclisches Ringgerüst mit Diphosphet ‐ Grundstruktur unter Einbeziehung von doppelt deprotoniertem DBU

DBU ‐ Not Simply a Strong Base: A One‐Pot Synthesis of a Polycyclic Framework Consisting of a Diphosphete Central Unit and Two Units of Doubly Deprotonated DBU Two condensed five‐, six‐ and seven‐membered rings are fused in a spirocyclic fashion with a central four‐membered diphosphete ring in 4 , which unexpectedly is formed in a simple two‐component‐one‐pot reaction from Cl 2 P‐CH(SiMe 3 ) 2 and DBU. The latter is doubly deprotonated and acts as a bridge via C‐6 and N‐8 to a P‐P unit. The polyheterocycle 4 crystallizes in two modifications, whose molecular structures are almost identical.