Phosphine‐substituted N‐coordinated Stannylene: Efficient Catalyst in Ketone Hydroboration

P ‐substituted stannylene (Ph 2 PCH 2 )(L)Sn containing N,C,N ‐pincer ligand (L=[2,6‐(Me 2 NCH 2 ) 2 C 6 H 3 ]) was prepared. The complex was further oxidised to prepare P ‐substituted organotin (IV) compounds (Ph 2 PCH 2 )(L)SnX 2 . Finally, P(S) ‐substituted N ‐coordinated stannylene [(Ph 2 P(S)CH 2 ](L)Sn containing P atom in the oxidation state +V was also prepared. All these P ‐substituted organotins were tested as catalysts for the hydroboration of ketones to see the effect of oxidation numbers of Sn/P atoms. Stannylene (Ph 2 PCH 2 )(L)Sn showed remarkable conversions with TOF about 1800 h −1 and is suitable for the reduction of several ketones. The mechanistic studies are also discussed.