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Herein, we report the first 1,4‐diphosphinine‐1,4‐diide compound [(ADC Ph )P] 2  ( 5‐Ph ) (ADC Ph =PhC{(NDipp)C} 2 ; Dipp=2,6‐ i Pr 2 C 6 H 3 ) derived from an anionic dicarbene (ADC Ph ) as a red crystalline solid. Compound  5‐Ph  containing a 16π‐electron planar fused‐tricyclic ring system was obtained by the 4e reduction of [(ADC Ph )PCl 2 ] 2  ( 4‐Ph ) with Mg (or KC 8 ) in a quantitative yield. Experimental and computational results imply that the central 8π‐electrons C 4 P 2  ring of  5‐Ph , which is fused between two 6π‐electrons C 3 N 2  aromatic rings, is antiaromatic. Thus, each of the phosphorus atoms of  5‐Ph  has two electron‐lone‐pairs, one in a p‐type orbital is in conjugation with the C=C bonds of the C 4 P 2  ring, while the second resides in a σ‐symmetric orbital. This can be shown with the gold complex [(ADC Ph )P(AuCl) 2 ] 2  ( 6‐Ph ) obtained by reacting  5‐Ph  with (Me 2 S)AuCl. A mixture of  5‐Ph  and  4‐Ph  undergoes comproportionation in the presence of MgCl 2  to form the intermediate oxidation state compound [(ADC Ar )P] 2 (MgCl 4 ) ( 7‐Ph ), which is an aromatic species.

Isolation of a 16π‐Electrons 1,4‐Diphosphinine‐1,4‐diide with a Planar C 4 P 2 Ring