Reaction of MgCIR(OEt2) [R = CH(SiMe,),] with GeC12-dioxane in OEt2 yields the bright yellow crystalline Ge2R4[having a trans-folded C2,., Ge2C4 framework with a fold angle of 32", a germanium environment intermediate between pyramidal and planar (sum of angles at Ge = 3487, and a GeGe bond length of 2.347(2) A (ca. 4% shorter than in elemental germanium)], which behaves chemically as a singlet germylene GeR2.There has been much recent interest in thermally stable compounds having a 'double bond' between two main group atoms other than carbon, nitrogen, or a chalcogen, the dimetallenes. We define these as the heavy atom congeners of the olefins R'2C=CR'2, azo compounds R'N=NR', or Schiff bases R'2C=NR''. They are thus binuclear molecules of

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The reaction of GaC13 or InCl, with the sterically hindered Li[CH(SiMe3)z] (LiR) yields white crystalline MR,, whereas InC13 with Li(CHPhz) gives In, Ph2CH2, and (PhZCH),. Treatment of InC13 with LiR (in a 1:l or 2:l ratio) in diethyl ether also gave InR3 and not an alkylindium(II1) chloride. Addition of Li[N(SiMe,),] to InBr or InCl in Et20 or LiR to InBr in Et,O at low temperature gives In, with RH + Rz as the organic coproducts in the LiR experiment. Irradiation of B(Cl)R2 with [EtNCHZCH2N(Et)C], in pyridine in the cavity of an ESR spectrometer yields a broad signal, g,, = 2.0034, which is persistent at 30 OC, and is believed to be due to (BRz--)(NC5H5+). The structure of the crystalline In[CH(SiMe3)z]3 has been determined by X-ray crystallography. It crystallizes (with disordered EtzO solvent) in the space group P31c with a = b = 16.302 (6) A, c = 8.890 (3) A, and 2 = 2. The structure was solved by heavy-atom methods and refined to R = 0.032 and R, = 0.041 for 1022 observed reflections. The crystal consists of discrete monomer molecules: the In atom is three-coordinate and lies 0.191 A above the symmetry-related carbon atoms C(1), with CInC angles of 119.3 (2)' and a rather long In-C( 1) bond length of 2.196 ( 6 ) A. The compound is of interest as the first crystallographically authenticated monomeric, heavy group 3 metal trialkyl.