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Homogeneous CO Hydrogenation: Ligand Effects on the Lewis Acid ...

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Refinement of F 2 against ALL reflecti<strong>on</strong>s. The weighted R-factor (wR) and goodness of fit (S) are based<br />

<strong>on</strong> F 2 , c<strong>on</strong>venti<strong>on</strong>al R-factors (R) are based <strong>on</strong> F, with F set to zero for negative F 2 . The threshold expressi<strong>on</strong> of F 2 ><br />

2σ( F 2 ) is used <strong>on</strong>ly for calculating R-factors(gt) etc. and is not relevant to <strong>the</strong> choice of reflecti<strong>on</strong>s for refinement.<br />

R-factors based <strong>on</strong> F 2 are statistically about twice as large as those based <strong>on</strong> F, and R-factors based <strong>on</strong> ALL data will<br />

be even larger.<br />

All esds (except <strong>the</strong> esd in <strong>the</strong> dihedral angle between two l.s. planes) are estimated using <strong>the</strong> full<br />

covariance matrix. The cell esds are taken into account individually in <strong>the</strong> estimati<strong>on</strong> of esds in distances, angles<br />

and torsi<strong>on</strong> angles; correlati<strong>on</strong>s between esds in cell parameters are <strong>on</strong>ly used when <strong>the</strong>y are defined by crystal<br />

symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.<br />

S185

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