Nonius CAD4 diffractometer, while those for 1a·0.5C2H4Cl2
and 10a·0.5C6H6 were collected on an Oxford Diffraction CCD
diffractometer (Xcalibur 3), applying graphite monochromated
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˚
Mo-Ka radiation (l = 0.71073 A). Absorption correction was
carried out applying psi-scans (7a·0.5CH2Cl2) or SADABS25a
(1a·0.5C2H4Cl2, 10a·0.5C6H6). All structure determination cal-
culations were performed with the WINGX package25b that
comprises SIR-97,25c SHELXL-9725d and ORTEP-3 programs.25e
Final refinements based on F2 were carried out with anisotropic
thermal parameters for all non-hydrogen atoms, except those
belonging to the solvent molecules (i.e. CH2Cl2 and C6H6). The
occupancy factors for the solvents’ carbon atoms were refined
giving a value close to 0.5. As a consequence, the occupancy factor
of the latter atoms was fixed to 0.5 in the last refinement cycle.
The geometry of the solvent molecules was modeled applying
DFIX restraints. Hydrogen atoms were included in the refinement
using a riding model with isotropic U values depending on
the Ueq. CCDC reference number for 1a·0.5C2H4Cl2: 739871,
7a·0.5CH2Cl2: 696685 and 10a·0.5C6H6: 96684.
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Commun., 2005, 1592–1594.
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Acknowledgements
The authors thank the European Commission for financing the
project IDECAT (NoE contract no. NMP3-CT-2005-011730).
Additional support by the Swiss National Science Foundation
and the ETH Zu¨rich is gratefully acknowledged.
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