M. Westerhausen et al., SYNTHESIS OF SUBSTITUTED CALCIUM-BIS(DISI LYLAMIDES) BY TRANSMETALATION OF TIN(II) AND TIN(IV) AMIDES, Zeitschrift fur anorganische und allgemeine Chemie, 622(8), 1996, pp. 1295-1305
Citations number
78
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Zeitschrift fur anorganische und allgemeine Chemie
Stannylenes as well as stannanes with substituted disilylamino groups
are valuable synthons for the synthesis of alkaline earth metal bis(di
silylamides) via the transmetallation reaction. Whereas bis -tetrameth
yl-2,5-disilaaza-cyclo-pentyl]stannylene 1 is a suitable reagent for t
his type of reaction, hylsilyl-tris(trimethylsilyl)silylamino]stannyle
ne 2 (monoclinic, P2(1)/c, a = 1492.6(2), b = 1705.2(2), c = 1865.3(3)
pm, beta = 109.03(2)degrees, Z = 4) is not only attacked at the Sn-N-
bond but also the N-Si-bond is cleaved by calcium metal. Similar light
sensitivity as for 2 is observed for the mercury bis [trimethylsilyl-
tris(trimethylsilyl)silylamide] 3, the homolytic M-N-bond cleavage lea
ds to the formation of the trimethylsilyl-tris(trimethylsilyl)silylami
no radical (g = 2.00485; a(N) = 16.2 G). The calcium tin exchange reac
tion of 1 in THF yields ahydrofuran-O)calcium-bis[2,2,5,5-tetramethyl-
2,5- disilaaza-cyclo-pentanide] 4 (monoclinic, P2(1)/n, a = 1060.9(2),
b = 1919.3(5), c = 1686.0(3) pm, beta = 90.30(2)degrees, Z = 4). The
stannanes Me(n-4)Sn[N(SiMe(3))(2)](n) with n = 1 or 2 are also valuabl
e materials for the synthesis of ydrofuran-O)calcium-bis[bis(trimethyl
silyl)amide].