Effect of fluorine and trifluoromethyl substitution on the donor properties and stereodynamical behaviour of triarylphosphines

Palladiumdichloride (ferrocenylethynyl)phosphanes and their use in Pd-catalyzed Heck–Mizoroki- and Suzuki–Miyaura carbon–carbon cross-coupling reactions

“…The C-P-C inter-valence angles at P1 (Fig. 3) are in the typical range for tertiary phosphane selenides [15]. The 31 P{ 1 H} NMR data together with the 1 J( 31 P-77 Se) coupling constant for the phosphane selenides 2a-2c are summarized in Table 1.…”

“…Characteristic for 2c is the P-Se bond with 2.0991(11) Å, which is identical to that of other phosphane selenides, for example, tris(m-trifluoromethylphenyl) phosphane selenide [15] and tris(2-furyl)phosphane selenide (Hydrogen atoms were omitted for clarity). All cyclopentadienyl rings are perfectly parallel oriented with C-C separations ranging from 3.635 to 3.712 Å.…”

Extremely bulky triarylphosphines incorporating 2,6-diisopropylphenyl substituents; consideration of steric shielding and steric pressure

“…This orientation has been defined as the exo 3 conformation [28], and is commonly seen in the crystal structures of free orthosubstituted arylphosphines, including all those listed in Table 1. NMR measurements confirm that this is also the geometry retained as the major conformer in solution for some of them [29].…”

Synthesis, Characterization and Catalytic Application of Iron Complexes Modified by Monodentate Phosphane Ligands

“…In accordance with other monodentate iron phosphane complexes reported in the literature, four carbonyl groups are attached to the iron centre. [11,12] For the carbonyl ligand in the trans position with respect to the phosphane ligand, a shorter Fe-C distance (1.768 Å) could be observed because of the transeffect of the phosphane ligand. The cis-positioned carbonyl ligands show almost equal Fe-C distances (1.784-1.794 Å).…”