Carbon Extrusion/Cluster Contraction: Synthesis of the Fluorinated Cyano‐ closo ‐Undecaborate K 2 [3‐NC‐ closo ‐B 11 F 10 ]

Releasing carbon : Deprotonation of the amino group of the [1‐H 2 N‐ closo ‐CB 11 F 11 ] − anion results in a transformation of the carba‐ closo ‐dodecaborate cluster into a closo ‐undecaborate dianion. The rearrangement is accompanied by loss of a fluoride anion, and the CN fragment is converted into a cyano ligand (see scheme).