The reaction of C6F5CN with the dimeric lithium salt [Li(NSiMe3)·Et2O]2 yielded a 11:9 mixture of (Me3Si)2NC6F4CN-41 and LiN(C6F4CN-4)2·2thf, respectively (thf = tetrahydrofuran). The compounds were characterized spectroscopically and complex 2 by crystal structure determination. The central lithium forms a distorted trigonal bipyramid the apical position of which is filled by a nitrile nitrogen of an adjacent molecule, inducing chains running parallel to the b-direction of the crystal. The driving force for the production of 1 and 2 is the elimination of LiF and SiMe3F, respectively. The calculated enthalpy for formation of 2 is more favourable compared to that for formation of 1, although the similar yields indicate that similar enthalpies of activation apply to both systems.
|Number of pages||4|
|Journal||Journal of the Chemical Society. Dalton Transactions|
|State||Published - 21 Jul 1997|