Double Deprotonation of CH 3 CN by an Iron-Aluminium Complex.

Herein we present the first double deprotonation of acetonitrile (CH ₃ CN) using two equivalents of a bimetallic iron-aluminium complex. The products of this reaction contain an exceeding simple yet rare [CHCN] ^2- dianion moiety that bridges two metal fragments. DFT calculations suggest that the bonding to the metal centres occurs through heavily polarised covalent interactions. Mechanistic studies reveal the intermediacy of a monomeric [CH ₂ CN] ^- complex, which has been characterised in situ. Our findings provide an important example in which a bimetallic metal complex achieves a new type of reactivity not previously encountered with monometallic counterparts. ^[1, 2] The isolation of a [CHCN] ^2- dianion through simple deprotonation of CH ₃ CN also offers the possibility of establishing a broader chemistry of this motif.
Competing Interests: The authors declare no conflict of interest.
(© 2023 The Authors. Angewandte Chemie published by Wiley-VCH GmbH.)