Angewandte
Chemie
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[17] A molecular model based on a so-called octant scheme by Pino
et al.[2] suggests that at a L,R,R titanium site, styrene inserts via
the si (pro-R) face with secondary regiochemistry, resulting in a
chain of R configurations; likewise styrene inserts at a D,S,S
titanium site via the re (pro-S) face forming in a chain of S
configurations.
[18] X-ray crystal structural data for complex rac-2a:
C75H108Cl4O4S4Ti2, Mr = 1439.45, T= 110 K, crystal dimensions
0.3 0.3 0.2 mm3, monoclinic, P21/c (no. 14), a = 9.9475(9), b =
30.095(3), c = 26.477(2) , a = g = 908, b = 100.385(2)8, Z = 4,
U = 7796.6(12) 3, 1calcd = 1.226 gcmÀ3, m = 0.494 mmÀ1, 114914
collected, 21765 unique (Rint = 0.0619), final R1 = 0.0618, wR2
[I > 2s(I)] = 0.1178, residual electron density extremes were
0.536 and À0.379 eÀ3. CCDC-637376 contains the supplemen-
tary crystallographic data for this paper. These data can be
obtained free of charge from The Cambridge Crystallographic
Angew. Chem. Int. Ed. 2007, 46, 4790 –4793
ꢀ 2007 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
4793