Category: chiral-nitrogen-ligands. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about New Hydrazide based Tricyclic Pentacoordinate Siliconium Ions -A Facile Route to the Synthesis of Spherical Shaped Sr5(PO4)2SiO4. Author is Suman, Pothini; Bhat, Haamid R.; Janardan, Sannapaneni; Bortamuli, Sidhartha Protim; Jha, Prakash C.; Sivaramakrishna, Akella.
Hydrazide based phosphine linkers were prepared by the condensation reaction of hydrazide of the type RC(O)NHNH2 (R = t-BuPh) with dppe (1,2-bis (diphenylphosphino)ethane) to produce the corresponding product of the type RCONHN=PPh2CH2CH2PPh2 = NNHCOR. The silylation product RC (OSiMe3) = N-N=PPh2-CH2CH2PPh2 = N-N=C (OSiMe3)R derived from RCONHN=PPh2CH2CH2PPh2 = NNHCOR reacts with halosilanes to yield novel hypercoordinate silicon (IV) complexes. All the products are well characterized by the spectroscopic and anal. data. The DFT calculations indicate that both charge d. and electronegativity of the atoms surrounding a magnetically active nucleus have an effect on the chem. shift values. An increase in the electronegativity of the substituted atoms is reflected by the natural hybrids, which causes deshielding of the magnetic Si and P nuclei from the external magnetic field to an increasing level. As a consequence of this, the 29Si and 31P NMR chem. shifts increase for the hypercoordinate silicon (IV) complexes thus augmenting the exptl. interpretations. Since the phosphorus hydrazide based hypercoordinate Si (IV) complexes are the rich sources of P, and Si directly from a single mol., the present work also demonstrates the preparation of spherically shaped strontium phosphosilicate (Sr5(PO4)2SiO4) by the sol-gel method.
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis