Mixed-alkali-metal metalation of toluene in the presence of TMEDA produces the benzyl complex [(PhCH(2))(4)Li2-xNa2+x(TMEDA)(4)], which has an octagonal ring structure that, in. spite of the 4-fold aggregation, contains Li+ cations complexed by bidentate TMEDA, a situation normally sterically forbidden in, homometallic lithium tetramers.
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Baker et al. (1994) studied this question.