17982-63-7

Upstream product

• 38186-51-5 diethyl (4-bromobenzyl)phosphonate 
• 20074-79-7 diethyl (4-aminobenzyl)phosphonate 

Relevant academic research and scientific papers

A novel click-chemistry approach to flame retardant polyurethanes

The low thermo-oxidative properties of PU foams somewhat limits their practical application, particularly as heat sensitive materials. The introduction of a covalently linked flame retardant organophosphonate ester into the PU foam was achieved using the

Azido-Functionalized Aromatic Phosphonate Esters in RPOSS-Cage-Supported Lanthanide Ion (Ln = La, Nd, Dy, Er) Coordination

Within this work, a modified preparation of diethyl 4-azidobenzylphosphonate (L1) is presented and the family of 4- or 4′-azido-substituted aromatic phosphonate esters is increased by three new ligand platforms: diisopropyl 4-azidobenzylphosphonate (L2), diisopropyl ((4′-azido-[1,1′-biphenyl]-4-yl)methyl)phosphonate (L3), and diisopropyl 4-azido-2,3,5,6-tetrafluorobenzylphosphonate (L4), which exhibit an anomalous splitting of the N3 stretching vibrations. Subsequent coordination to the in situ generated RPOSS (polyhedral oligomeric silsesquioxane)-cage-supported lanthanide precursors [(Ln{RPOSS})2(THF)m] (P1-P6) (Ln = La, Nd, Dy, Er; R = iBu, Ph; m = 0, 1) yields complexes of the general formula [Ln{RPOSS}(L1-L4)n(S1)x(THF)m] (1-30) (n = 2, 3; x = 0, 1; m = 0-2) retaining the azide unit for future semiconductor surface immobilization. Because the latter compounds are mostly oils or viscous waxes, preliminary solution-state structure elucidations via DOSY-ECC-MW estimations have been carried out which are in accordance with 1H NMR integral ratios as well as solid-state structures, where available. Moreover, the optical properties of the Nd, Dy, and Er derivatives of complexes 1-30 are examined in the visible and NIR spectral regions, where applicable.

[...] derivative compounds

PROBLEM TO BE SOLVED: To provide compounds improved in specific accumulation in amyloid deposition sites.SOLUTION: There are provided styrylpyridine derivative compounds represented by a prescribed general formula or salts thereof, and pharmaceutical comp

Modular Synthesis of Elongated Phosphonate Bipyridines

The synthesis and the photophysical properties of a series of bpy-R2 derivatives L1-L3 (bpy = 2,2′-bipyridine, R represents the substitution at the 4- and 4′-positions of the bpy) are described. R includes phosphonic ester groups as precursors for potent phosphonate anchoring groups, which enable immobilization on transition metal oxide semiconductor surfaces for applications like dye-sensitized solar cells (DSSCs) or dye-sensitized photoelectrosynthesis cells (DSPECs). The ligands L1-L3 differ in the length of conjugated linker units between bpy core and anchoring groups. Phenylene and triazole moieties serve as building blocks for linker elongation. The resulting adjustability of the distance between semiconductor and chromophore represents a viable route to improve cell efficiency, as it will allow tuning of charge carrier recombination and dye aggregation. Furthermore the photophysical studies of the free ligands reveal a pronounced effect of the aryl substitution. The solid-state structures of L1 and L2 are reported within this contribution, enabling the determination of distances between bipyridine nitrogen donor and anchoring group.