X-ray crystal structure of cis-{(+/-)-6,6 '-[[1,1 '-biphenyl]-2,2 '-diylbis(oxy)]bis-dibenzo[d,f][1,3,2]dioxaphosphepin}diiodoplatinum(II)center dot dichloromethane

Bis(dibenzo[d,f][1,3,2]dixoaphosphepin) ligands are extensively used in cat alysts for asymmetric alkene hydroformylation; however, few crystal structu res of complexes of these ligands have been reported. In this paper, the sy nthesis and X-ray crystal structure of cis-{(+/-)-6,6'-[[1,1'-biphenyl]-2,2 '-diylbis(oxy)]bis-dibenzo[d,f][1,3,2]dioxaphosphepin} diiodoplatinum (II) . dichloromethane are presented. This complex crystallizes in the triclinic space group P (1) over bar with a = 12.0842(2,3) b = 12.6993(15) c = 13.28 01(18) Angstrom; alpha = 85.852(10), beta = 76.723(13), gamma = 72.400(12)d egrees, V = 1890.7(10) Angstrom(3) and Z = 4. The diastereomer that has cry stallized has an R*R*R*(S*S*S*) configuration. This X-ray crystal structure supports previous observations that bis(phosphite) ligands with bridging g roups derived from 2,2'-biphenol can exhibit a wide range of bite angles (> 20 degrees).