SUBVALENT GROUP-14 METAL-COMPOUNDS .13. OXIDATIVE ADDITION-REACTIONS OF GERMANIUM AND TIN AMIDES M(NR2)2 (R = SIME3, M = GE OR SN) WITH SULFUR, SELENIUM, TELLURIUM OR MEOOCC=CCOOME - X-RAY STRUCTURES OF [GE(NR2)2(MU-TE)]2 AND SN(NR2)2CC(OME)OSN(NR2)2CC(OME)O

The germanium and tin divalent amide M(NR2)2 (R = SiMe3, M = Ge or Sn) readily reacts with a chalcogen (E) or MeOOCC = CCOOMe to yield the appropriate metal(IV) oxidative addition product [M(NR2)2(mu-E)]n (E = S, Se or Te) (1-6) or activated Sn(NR2)2CC(OMe)OSn(NR2)2CC(OMe)O (7), respectively. Each of the compounds 1-7 has been characterized by microanalysis and NMR spectra and two of the compounds [Ge{N(SiMe3)2}2(mu-Te)]2 (3) and 7, by single crystal X-ray diffraction. Some selected geometric parameters are as follows. 3: <Ge-N> 1.86(1), <Ge-Te> 2.595(2), <Si-N> 1.76(2) angstrom; <TeGeTe'> 94.38(6), <GeTeGe'> 85.59(6)-degrees. 7: (MeO)C-C(OMe) 1.40(2), CC-C(OMe) 1.36(2), MeOCO-Sn 2.125(9), Sn-C 2.07(1), <Sn-N> 2.031(9), <Si-N> 1.75(1) angstrom. Each of the compounds Sn(eta-C5H4R)(NR2) (8) and Sn(eta-C5H3R2-1,3)(NR2) (9) was obtained in a mixture with Sn(NR2)2 and the appropriate bis(cyclopentadienyl)tin(II) compound. Sn-119 NMR chemical shifts are reported for compounds 4 and 6-9.