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The differences in reactivity between iodo-Gilman reagents R2CuLi⋅LiI and cyano-Gilman reagents R2CuLi⋅LiCN (see diagram; formerly R2Cu(CN)Li2) are less than the well-known effects of solvent (ether vs. THF) and TMSCl (in THF); this is consistent with the previous conclusion from several spectroscopic techniques and theoretical calculations that higher order cuprates are not involved.
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Bertz et al. (1999) studied this question.
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