It was fortunate that the first extended branched polysilyl anion (Me3 SiMe2 Si)3 Si(-) could be crystallographically characterized in two forms-as the THF complex 1 and as the dimer 2. Comparison with the analogous (Me3 Si)3 SiLi systems 3 and 4 shows that β-Me3 Si substitution and complexation by THF elongate the Si-Li distance by 0.09-0.14 Å and 0.04-0.07 Å, respectively.
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Apeloig et al. (2001) studied this question.
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