2H; ReCH,), 0.90/2.25 (2 m, 2 x 6 H ; CCH,), 1.17 (m, 1 H; CH). "Ci'HJNMR (100.5 MHz. C,D,, 20°C): 6 = -0.16 (SiCH,), 35.81 (SiCH,). 20.81 (CH), 25.76/47.41 (CCH,); IR: i[cm-'] = 926 (vs) (CS,), 922 (vs) (KBr); FD MS (n-pentane): m/z 433 (M").[8] Za'quinuclidine: Orange columns from CS, solution (-25°C). 0.51 x 0.15 x 0.10 mm; systematic absences: h01 (h + I = 2n + 1); OkO ( k = 2n + 1); space group: monoclinic, P2,/n (Int. Tab. No. 14); u = 664.3(3), b = 881.1(4), c = 2009.1(9)pm, b = 98.98(2)", V = 1161 x 10, pm3; Z = 4; Fooo =712; e,,,,d = 2.141 g cm-,; Enraf-Nonius CAD-4. Mo,, (A = 71.073 pm), graphite monochromator; T = 23 k 3' C; measuring range 2.0 < 0 < 25.0"; o scan; 1900 unique reflections with I > 0.0 used for refinement; R = 0.034; R , = 0.018; GOF = 1.889. Direct methods, difference Fourier technique; empirical absorption correction, p = 105.9 cm-', nine reflections; decomposition -11.2% in 34 h. anisotropic correction. Hydrogen atom positions were calculated (d(C-H)=95 pm) and included in the structure factor calculation. hut not refined. Anomalous dispersion was taken into consideration. Shiftierror: <0.01 in the last cycle of the refinement; residual electron density: + 0.90 e, k 3 at 75 pm and -1.07 e, A-3 at 74 pm from the rhenium atom. Zc . quinuclidine: Yellow cubes from n-pentane (25 "C); 0.56 x 0.30 x 0.21 mm; systematic absences: hOl (1 = 2n + 1); OkO ( k = 2n + 1): space group, monoclinic. P2Jc (Int. Tab. No. 14); a = 667.7 (3). h = 2065.8(4), c = 1140.9(7) pm, p = 96.42(2)", V = 1564 x 106 pm3; Z = 4; Fmo = 840; = 1.837 g cm-'; Enraf-Nonius CAD-4. Mo,. (i. =71.073 pm). graphite monochromator; T = 23 If: 3°C; measuring range: 2.0 < 0 < 25.0"; 2429 unique reflections ( I z 0.0); R = 0.039;R, = 0.021; GOF = 1.848. Patterson methods, difference Fourier technique; empirical absorption correction, p =79.5 cm-I, eight reflections; 23.1 % decomposition, corrected. Hydrogen atom positions were calculated (d(C-H) = 95 pm) and included in the structure factor calculation, but not refined. Anomalous dispersion was taken into consideration. Shift/er-Tor: < 0.01 in the last cycle of the refinement; residual electron density: