The mixture was stirred at 115 ◦C for 24 h. The reaction was
quenched with deionized water and the biaryl product extracted
with Et2O and dried with MgSO4. The volatiles were removed
under vacuum to give a crude product which was analyzed by
GC-mass chromatography.
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X-Ray diffraction studies
Suitable crystals were mounted on quartz fibers and X-ray data
were collected on a Bruker AXS APEX diffractometer equipped
with a CCD detector, using graphite-monochromated MoKa
˚
radiation (l = 0.71073 A). The data were corrected for Lorentz
and polarization effects with the SMART program suite and for
absorption effects with SADABS. The crystal structures were
solved by direct methods and refined by full-matrix least squares
on F2 using the SHELXTL program package.18 For 6·2C6H5CH3,
the toluene solvate shows two-fold disorder and was refined with a
disorder model. The occupancy factors for the two disordered
parts were refined with 0.52 : 0.48. All non-hydrogen atoms
were refined anisotropically. Hydrogen atoms were calculated in
ideal geometries and refined isotropically. Selected crystal data for
complexes 6–10 are summarized in Table 4.
Acknowledgements
9 P. J. Fraser, W. R. Roper and F. G. A. Stone, J. Chem. Soc., Dalton
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We are grateful to Agency for Science, Technology & Research
(R143-000-277-305), Ministry of Education (R-143-000-361-112)
and the National University of Singapore for financial support.
We thank G. K. Tan and L. L. Koh for their assistance in X-ray
analysis.
13 H. V. Huynh, C. Holtgrewe, T. Pape, L. L. Koh and E. Hahn,
Organometallics, 2006, 25, 245.
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1858 | Dalton Trans., 2009, 1853–1858
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