The complex trans-Melr(CO) (PPh3)2 readily undergoes addition reactions with a variety of small molecules such as H2, CO, Me02CCH=CHC02Me, Me02CC=CC02Me, 02, CH3I, and H2C(0) to yield well-characterized products. Further reactions of the addition complexes are noted in most cases. The species irons-Melr(CO) (PPh3)2 crystallizes in the centrosymmetric triclinic space group Pi with o = 9.2497 (9)A, b = 9.6080 (11) A, c = 10.4855 (14) A, a = 72.390 (10)°, ß = 88.990 (9)°, y = 69.224 (8)°, V = 826.22 (16) A3, Z = 1, and D(caled) = 1.53 g cm"3 for mol wt 759.9. Diffraction data (Mo Ka, 29 = 4.5-50.0°) were collected with a Syntex P21 automated four-circle diffractometer and refined to RF = 1.8% and R"F = 2.1% for the 2922 independent reflections (none rejected). The molecule lies on a center of symmetry and is disordered with CO and Me ligands occupying square-planar sites rigorously coplanar with the iridium atom. The Ir-P distances are each 2.300 (1) A; estimated IMÜO and Ir-Me distances are ~1.835 and ~2.17 A, respectively.
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