SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF THE BERYLLIUM COMPOUNDS [BE(2,4,6-ME3C6H2)2(OET2)], [BE(O(2,4,6-T-BU3C6H2))2(OET2)], AND [BE(S(2,4,6-T-BU3C6H2))2(THF)].PHME AND DETERMINATION OF THE STRUCTURE OF [BECL2(OET2)2]

The preparations of some new classes of beryllium compounds that have a coordination number of 3 at beryllium are reported. They were synthesized by the reaction of BeCl2(OEt2)2 With the appropriate lithium salt to give the products [BeMes2(OEt2)] (1; Mes = 2,4,6-Me3C6H2), [Be(OMes*)2(OEt2)] (2; Mes* = 2,4,6-t-Bu3C6H2), and [Be(SMes*)2(THF)].PhMe (3). The compounds were characterized by H-1 NMR and IR spectroscopy, C and H analysis, and X-ray crystallography. The crystal structure of [BeCl2(OEt2)2] (4) was also determined. Crystal data (Mo Kalpha (lambda = 0.710 69 angstrom) at 130 K) are as follows: [BeMeS2(OEt2)] (1), a = 11.913(3) angstrom, c = 28.390(8) angstrom, V = 4029(2) angstrom3, tetragonal,space group I42mBAR, 975 (I > 3sigma(I)) data, R = 0.042; [Be(OMes*)2OEt2] (2), a = 25.022(9) angstrom, b = 9.834(3) angstrom, c = 16.290(4) angstrom, beta = 96.48(3)-degrees, V = 3982(2) angstrom3, monoclinic, space group C2/c, 3173 (I > 3sigma(I)) data, R = 0.051; [Be(SMes*)2THF].PhMe (3), a = 8.695(4) angstrom, b = 17.399(10) angstrom, c = 17.437(8) angstrom, alpha = 60.80(4)-degrees, beta = 83.29(4)-degrees, gamma = 84.24(4)-degrees, V = 2284(2) angstrom3, triclinic, space group P1BAR, 3751 (I > 2sigma(I)) data, R = 0.061; [BeCl2(OEt2)2] (4), a = 7.486(3) angstrom, c = 20.022(8) angstrom, V = 971.7(6) angstrom3, trigonal, space group P3(1)2(1), 646 (I > 2sigma(I)) data, R = 0.028.