Organometallics other along the (a + c)/2 direction. A diagram of the unit cell is available."The structure is consistent with that of Mg(SiMe3)?. DME in which the Si-C distance is 2.630 (2) A and Si-Mg-Si angle is 125.2 ( 1 ) O . The smaller Si-Mg-Si angle in the present result (115') may be explained by VSEPR theory on the basis that the weaker base, TMEDA, will form less polar Mg-N bonds than the Mg-0 bonds in the DME adduct. Alternatively the methyl groups on TME-DA may cause interference with those on the trimethylsilyl group forcing the smaller angle separation between these units. Further, the N-Mg bond distances and angles are similar to those observed for organomagnesium compounds. Comparison with the three complexes MgMe2.TMEDA,22 which have average N-Mg distances of 2.24,2.20, and 2.26 A and N-Mg-N angles of 81.5,82.5, and 82.5, respectively, are clearly within the range of those observed in the present system. MgPh2.TMEDA,B and q5-C5H5MgBr.(Et2N(CH2)2NEt2),24 (22) Greiser, T.; Kopf, J.; Thoennes, D.; Weiss, E. J. Organomet.1983,2, 750-755

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