SHELXTL suite of programs.24 The structures were solved by
direct methods to locate the heavy atoms, followed by difference
maps for the light non-hydrogen atoms. In 1d, The C1–C2 of the
C3H6 chain is disordered into two positions with 66 : 34 ratio. The
disordered parts C1–C2 and C1x–C2x were refined with the ratio
as free-variable to give the final ratio of 65/35. The bond lengths
involving these disordered atoms were also restrained to avoid
excessive deviations of the bond lengths and thermal parameters
from normal values. There is also a disorder in 3a involving the
switching of one Cl and the acetonitrile at 61 to 39 occupancies.
The Cl/acetonitrile disordered pair occupancy ratio was refined
as a free variable. Restraints were also applied to the bond lengths
and thermal parameters of the acetonitrile to keep them in the
usual range as these did not behave well during refinement. The
data collection and processing parameters are given in Table 3.
CCDC reference numbers 637514 (1d), 637515 (3a) and 637516
(3b). For crystallographic data in CIF or other electronic format
see DOI: 10.1039/b702636f.
7 (a) Z.-X. Yu and K. N. Houk, Angew. Chem., Int. Ed., 2003, 42, 808;
(b) A. N. J. Blok, P. H. M. Budzelaar and A. W. Gal, Organometallics,
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8 A. Bollmann, K. Blann, J. T. Dixon, F. M. Hess, E. Killian, H.
Maumela, D. S. McGuinness, D. H. Morgan, A. Neveling, S. Otto,
M. Overett, A. M. Z. Slawin, P. Wasserscheid and S. Kuhlmann, J. Am.
Chem. Soc., 2004, 126, 14712.
9 (a) R. Walsh, D. H. Morgan, A. Bollmann and J. T. Dixon, Appl. Catal.,
A, 2006, 306, 184; (b) S. Kuhlmann, J. T. Dixon, M. Haumann, D. H.
Morgan, J. Ofili, O. Spuhl, N. Taccardi and P. Wasserscheid, Adv. Synth.
Catal., 2006, 348, 1200; (c) A. Jabri, P. Crewdson, S. Gambarotta, I.
Korobkov and R. Duchateau, Organometallics, 2006, 25, 715; (d) E.
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10 M. J. Overett, K. Blann, A. Bollmann, J. T. Dixon, D. Haasbroek, E.
Killian, H. Maumela, D. S. McGuinness and D. H. Morgan, J. Am.
Chem. Soc., 2005, 127, 10723.
11 M. J. Overett, K. Blann, A. Bollmann, J. T. Dixon, F. Hess, E. Killian,
H. Maumela, D. H. Morgan, A. Neveling and S. Otto, Chem. Commun.,
2005, 622.
12 See for example: (a) C. Wang, Z. Ma, X.-L. Sun, Y. Gao, Y.-H. Guo, Y.
Tang and L.-P. Shi, Organometallics, 2006, 25, 3259; (b) D. J. Jones, V. C.
Gibson, S. M. Green, P. J. Maddox, A. J. P. White and D. J. Williams,
J. Am. Chem. Soc., 2005, 127, 11037; (c) E. Y. Tshuva, S. Groysman,
I. Goldberg, M. Kol and Z. Goldschimdt, Organometallics, 2002, 21,
662.
13 (a) Z. Weng, S. Teo, L. L. Koh and T. S. A. Hor, Angew. Chem., Int.
Ed., 2005, 44, 7560; (b) Z. Weng, S. Teo, L. L. Koh and T. S. A. Hor,
Chem. Commun., 2006, 1319; (c) Z. Weng, S. Teo and T. S. A. Hor,
Organometallics, 2006, 25, 4878.
14 (a) K. G. Gaw, M. B. Smith and A. M. Z. Slawin, New J. Chem., 2000,
24, 429; (b) M. S. Balakrishna, T. K. Prakasha and S. S. Krishnamurthy,
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Acknowledgements
Financial support from the National University of Singapore and
a scholarship to S. T. are gratefully acknowledged. The authors
are grateful to Dr L. L. Koh and Ms G. K. Tan for assistance in
the crystallographic analysis.
15 P. R. Elowe, C. McCann, P. G. Pringle, S. K. Spitzmesser and J. E.
Bercaw, Organometallics, 2006, 25, 5255.
16 (a) M. R. I. Zubiri and J. D. Woollins, Comments Inorg. Chem., 2003, 24,
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17 Z. Weng, S. Teo and T. S. A. Hor, Singapore patent application (No.
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18 A. Zahoor, F. Al-Sherehy, O. Olabisi, M. Abdillahi and M. Saeed, US
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3498 | Dalton Trans., 2007, 3493–3498
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The Royal Society of Chemistry 2007
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