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Square-planar complexes of the type RZMX (M = Pt or Pd), containing the terdentate ligand 2,6-(Me,NCH,),C,H,, undergo with Me1 (M = Pt, X = BF,) oxidative addition and consecutive reductive elimination resulting in the formation of the complex BF,-[IPtgR-Me]+ in which the C-aryl centre, a t which C-C coupling has occurred, is bonded to the cationic Pt-centre by a novel Pt-to-C-interaction.

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Insertion of isocyanides into the Cu-C bond of arylcopper ( I) compounds affords novel, thermally stable a-cupriobenzylideneamines.RECENTLY we reported the isolation and characterization of thermally, oxidatively, and hydrolytically stable arylcopper(1) compounds which contain, preferably in the ortho position, hetero-atom containing substituents (e.g. NMe,, OMe, CH,-NMe,, and CH,.OMe).l We have now found that these compounds readily react with isocyanides to afford a-cupriobenzylideneamines instead of organocopper isocyanide complexes. t The observed insertion reaction represents a novel reaction type in organometallic chemistry of Group IB elements.

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Abstract:The crystal and molecular structure and absolute configuration of 2-[ l-(S)-Me2NCH(Me)]C6H4SfnMePhBr, which is the first example of a diastereomerically pure chiral triorganotin halide, are determined by a single-crystal x-ray diffraction study. Crystals are orthorhombic, space group P212121 with Z = 4 in a unit cell of dimensions n = 9.370 (4), b = 13.361 (3), and c = 14.283 (4) A. The final R value is 0.048 for 2784 reflections. The tin atom has a distorted trigonal bipyramidal geometry with the C,N-bonded Me2NCH(Me)C6H4 group spanning one equatorial (C) and one axial (N) site. The Ph and M e groups reside in the two equatorial positions resulting in an (S)sn configuration at the tin atom (cf. Figure 1). The configuration at Sn was unambiguously determined by using anomalous diffraction effects which likewise resulted in an independent check of the configuration at the CY-C atom (S configuration). The

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