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Bis(arylimido) Complexes of Chromium (VI)

By Martyn P Coles, Christopher I Dalby, Vernon C Gibson, William Clegg and Mark R J Elsegood


A synthetic entry into bis(arylimido) chromium(VI) chemistry is described. Cr(NAr)2(NHBut)Cl (1; Ar = 2,6-Pri2C6H3 may be obtained (1) by treatment of Cr(NBut)2Cl2 with two equivalents of 2,6-diisopropylaniline in pentane, or (2) via the reaction of Cr(NBut)2Cl2 with two equivalents of LiNHAr in Et2O. An X-ray structure determination on 1 reveals a pseudo-tetrahedral coordination geometry with Cr---N distances of 1.643(3) and 1.654(4) Å for the imido groups and 1.813(3) Å for the tertbutylamido ligand ; the substituents of the amide are orientated perpendicular to the Cl---Cr---N(amido) plane. Compound 1 is readily converted to Cr(NAr)2Cl2(2) by treatment with excess BCl3 in dichloromethane

Publisher: Elsevier
Year: 1995
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