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Die Reaktion des Ammoniumchlorides (II) mit den Rh(II)‐Komplexen (I), (IV) und (VI) liefert über eine oxidative Additionsreaktion die sekundären Rh(III)‐Carben‐ Komplexe (III), (V) und (VII).

Treatment of 2,4,6-tri-t-butylaniline (NH2Ar) with LiBun in OEt2 yields the white crystalline trans-[Li(p-NHAr)(OEt2)I2, (2), which in turn furnishes the orange Sn(NHAr)2 (with SnCI2) or a mixture of NiVNill amides {using [Ni12(PPh3)2]} which with CO affords colourless crystalline cis-[Ni(C0)2(NHAr),]; the lithium amide (2) has a centrosymmetric four-membered planar LiNLiN ring with the substituents at N arranged in a transoidfashion: Li-N = 2.041(6) and 1.987(5) A, Li-0 = 1.906(5) A, and LNLiN = 102.2(2)".

in polar solvents, to the corresponding cis-isomers. This rearrangement was first noted 676 when tmns-PtC1,-(CNPhCH,CH,NPh) (PEt,) was heated in order to determine its m.p. ; at ca. 200" the colour was discharged to produce cis-PtCl,(CNPhCH,CH,NPh) (PEt,) .59G (A single-crystal X-ray analysis has established the molecular structure for crystalline forms of both isomer^.^^^)