A New In4 Cluster with Short InIn Bonds in Trigonal‐Planar In(InTrip2)3

Trigonal-planar coordination is seen for the indium center in In(InTrip2)3 (1) (Trip  2,4,6-iPr3C6H2), the first indane with three unusually short bonds to indium substituents. The compound is obtained by the reduction of the diindane Trip2InInTrip2 with lithium metal. In contrast, reduction of the aluminum and gallium analogs gives the [Trip2MMTrip2]− anions, which have a MM π-bond order of 0.5.