Synthesis and structure of air-stable trans-1,1,4,4-tetrakis(trimethylsilyl)-1,3-butadiene

Article abstract of DOI:10.1021/om00126a010

The reaction of (CH₃)₃SiC≡CSi(CH₃)₃ and B₅H₉ at 135-140°C in a stainless-steel reactor produced the title compound III as an air-stable solid, along with the known compounds {[(CH₃)₃SiCH=CSi-(CH₃)₃] ₂BH}₂ (I) and nido-[(CH₃)₃Si]₂C₂B ₄H₆ (II). Compound III was characterized by IR, mass, and ¹H, ¹³C, and ²⁹Si NMR spectra and by single-crystal X-ray diffraction. Compound III crystallizes in the triclinic space group P1 (no. 2) with a = 6.466 (1) A?, b = 9.073 (2) A?, c = 10.965 (2) A?, α = 74.29 (2)°, β = 85.72 (1)°, γ = 71.90 (1)°, U = 589 (1) A?³, and Z = 1. Final refinement converged at values R = 0.0602 and R_w = 0.0699. Under similar conditions, the pyrolysis of [(CH₃)₃SiCH=CSi(CH₃)₃]₃B failed to produce III.