HPLC of Formula: 1663-45-2. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Inclusion of bidentate phosphine molecules in the supercage of FAU zeolite. Author is Okumura, Kazu; Morita, Sachiko; Ohtsuki, Akimichi; Takaba, Hiromitsu.
Bidentate phosphines (Ph2P(CH2)nPPh2) with different alkyl chain lengths (n = 1-10) were included in the supercage (SC) of FAU-zeolite. Thermal treatment of the mixture of a bidentate phosphines and FAU-zeolite at 443 K resulted in the inclusion of the former into the SC, with ≤ 0.75 mols. per SC. The included mols. were strongly bound by FAU-zeolite, with desorption observed at higher temperatures compared to those of unloaded ones. The sp. surface area of the FAU-zeolite decreased linearly with an increase in the number of phosphines included. This tendency was more emphasized in phosphines with n = 6-10 compared with those with n = 1-5. A characteristic shift in the C-C stretching band of the benzene ring was observed in the Fourier-transform IR spectroscopy (FT-IR) spectrum, due to the strong interaction between bidentate phosphines and FAU-zeolite; the extent was more when using *BEA-loaded ones. Formation of the inclusion compounds between bidentate phosphines and FAU zeolites was observed with the mol. dynamics (MD) calculations The bidentate phosphines included in the SC of the FAU-zeolite were reacted with PdCl2 to form Pd complexes. The detailed anal. of the Pd complexes with Pd K-edge EXAFS revealed a characteristic decrease in the Pd-Cl bond distance with the use of complexes with n = 3 and 4, suggesting that the local structure around Pd was distorted through the interaction of the Pd complexes with the pores of the FAU-zeolite. The Pd complexes included in the SC were active for allylic alkylation between allyl Me carbonate and Et acetoacetate.
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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