A specialty of silicon: A stable dimeric silaisonitrile (ArNSi:)2 (see picture; Ar=2,6-bis(2,4,6-triisopropylphenyl)phenyl) was prepared by the reduction of dichlorosilaimine IPr⋅Cl2SiNAr with KC8. The dimer is the first base-free disilylene with two-coordinate silicon atoms; reaction with trimethylsilyl azide affords the first bis(silaimine) (ArNSiNSiMe3)2 with three-coordinate silicon atoms.
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