Received 18 August 2009
The complete molecule of title compound, C58H58P4, is generated by a crystallographic twofold rotation axis that passes through the center of the C(methine)-C(methine) bond of length 1.582 (4) Å. The C-P bond lengths are 1.8824 (19) and 1.8991 (19) Å. The P-C-P angle of 109.69 (9)° is essentially equal to the expected value of 109.5° for a tetrahedral C atom. Although the C(methine)-P-C(aromatic) bond angles range from 102.67 (9) to 107.04 (9)°, the C(aromatic)-P-C(aromatic) bond angles of 96.72 (9) and 97.29 (9)° are significantly smaller. The steric demands of the o-tolyl groups cause deviations from the bond lengths and angles reported for its phenyl analog.
For 1,1,2,2-tetrakis[(diphenyl)phosphino]ethane, see: Braunstein et al. (1995a). For oxidative coupling of (bisphosphino)methanides, see: Braunstein et al. (1995b); Schmidbaur & Deschler (1983).
Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2005); data reduction: SAINT, XPREP (Bruker, 2005) and SADABS (Bruker, 2007); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL and CrystalMaker (CrystalMaker, 1994); software used to prepare material for publication: XCIF (Bruker, 2005).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: NG2629 ).
We thank the National Science Foundation (grant CHE-0548107) for support of this work. The Materials Chemistry Laboratory at the University of Illinois was supported in part by grants from the NSF (CHE 95-03145 and CHE 03-43032).
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