Synthesis and Structure of the Disilagermirane R2Ge(SiR2)2 and the Solvent‐Separated Ion Pair [Li([12]crown‐4)2][GeR3]; (R = SiMe3)

General name for these diphosphanes: (S.S)-2.2"-bis[(R)-l -(dialkylphosphino)ethyl]-l .I"-biferrocene. trans-[RhCI(CO)j(K,R)-(S.S)-riBuTRAP)] was prepared from [RhCI(CO),], and (R.R)-(S,S)-nBuTRAP: m.p. 222-225 C (decomp); [ X I ; ' = -760.3 (c = 0.321 in CHCI,): 'H NMR (200 MHr. CDCI,. TMS) 6 = 0.81 -1.00 (m. 12H).1.10-2.38(m.30H).2.8X(quint., J = 7 H z . l H ) , 3 . 0 X ( q u i n t . , J = 7 H z . I H ) , 4.03-4.09 (m, 2H). 4.28 (s, 5H). 4.31 (s, 5H). 4.35-4.45 (m. 4H); "P{'H; NMR (81 MHz, CDCI,. 85% H,PO,) 6 = 27.27 (dd, 'J(P.P) = 341. 'J(P,Rh) = I 1 9 Hr), 32.56 (dd. 'J(P.P) = 341. 'J(P.Rh) =I19 Hr). Orange crystals for the X-ray crystal structure were grown from CHLCI,;EtOH by solvent diffusion techniques: crystal data: orthorhombic. P2,2,2, (no. 19).

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