Strained and Reactive Donor/Acceptor‐Supported Metallasilanone

A novel stable donor/acceptor‐supported MnI‐metallasilanone 3 was synthesized. The intramolecular silanone‐MnI interaction induces a highly strained three‐membered cyclic structure, leading to an exceptionally high reactivity of 3 as a donor/acceptor complex of silanone. Indeed, metallasilanone 3 readily reacts with various small molecules such as H2 or ethylene gas in mild conditions. A new stable donor/acceptor‐supported MnI‐metallasilanone was synthesized. This silanone complex is highly strained because of its incorporation in a small cyclic structure formed by the intramolecular silanone‐MnI interaction. Thanks to the high ring strain, the interaction Si=O→Mn is labile, leading to an exceptionally high reactivity with various small molecules such as H2 or ethylene gas in mild conditions.