Structures of sterically overcrowded or charge-perturbed molecules: XXVIII.[(H3C) 3Si] 3C C C C [Si (CH3) 3] 3-a π-system concealed by a hydrocarbon veil

H Bock, J Meuret, K Ruppert

Index: Bock, Hans; Meuret, Jochen; Ruppert, Klaus Journal of Organometallic Chemistry, 1993 , vol. 462, # 1-2 p. 31 - 38

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Abstract

The kinetically shielded di(tris(trimethylsilyl)methyl)acetylene crystallizes in the triclinic space group P with 1 molecule per unit cell in rather dense lattice packing. Its staggered skeletal conformation of close to D 3d symmetry represents a sterically advantageous cogwheel gearing of the inner methyl groups of the half-shells of both substituents. The shortest nonbonded C ⋯ C distances of 400 pm between them equal the sum of the van der Waals radii of two H 3 C groups. A ...