An Adduct of Sulfur Monoxide to a Frustrated Sn/P Lewis Pair

Abstract

Abstract The geminal frustrated Lewis pair (F 5 C 2 ) 3 SnCH 2 P(tBu) 2 ( 1 ) reacted with N‐sulfinylaniline PhNSO to afford the first sulfur monoxide adduct of a main group metal, (F 5 C 2 ) 3 SnCH 2 P(tBu) 2 ⋅SO ( 2 ), which contains a SnCPSO ring. The second product is a phenylnitrene adduct of 1 . The surprising stability of 2 was compared with the stabilities of the so far inaccessible O 2 and S 2 adducts of 1 . Attempts to prepare these from 1 and the elemental chalcogens (O 2 , S 8 , Se ∞ , Te ∞ ) led to four‐membered SnCPE ring systems. Quantum‐chemical investigations of 2 demonstrate the bond polarity of the SO unit to stabilize 2 .