Molecular and crystal structure of tris(2-hydroxyphenyl)phosphine oxide

Synthesis and Coordination Properties of Tripodal Ligand on the Triphenylphosphine Oxide Platform with Carbamoyl Side Arms

“…The largest decrease in ν P O occurs on coordination to uranium in complex 3, ν = 80 cm −1 . This value is only 10 cm −1 lower than that in phosphine oxide 2 where, according to X-ray diffraction data, 26 the oxygen atom of the phosphoryl group forms a trifurcate H-bond: intramolecular H-bond with two hydroxyl groups of the substituents and similar intermolecular H-bond. It is possible that the coordinated P O group in the complex 3 forms an H-bond with coordinated water molecule (see below).…”

“…Tris(2-hydroxyphenyl)phosphine oxide (2) was prepared by procedure. 26 Tris(2-N,N-dibutylcarbamoylmethoxyphenyl)phosphine oxide (1). Potassium carbonate (2.55 g, 0.2 mol) was added to a solution of 0.65 g (0.002 mol) of phosphine oxide 2 in 25 mL of DMF, the resultant mixture was stirred for 20 min and 4.23 g (0.02 mol) of N,N-dibutylchloroacetamide was added.…”

Synthesis and molecular structure of functionalized tris[2‐(4′‐substituted butoxyphenyl)]phosphine oxides as precursors of tripodal ligands

“…Our approach to the synthesis of tripodal ligands is based on the key compound, tris(2‐hydroxyphenyl)phosphine oxide ( 1 ), readily available by isomerization of triphenyl phosphate on the treatment with lithium diisopropylamide . Initial phosphine oxide 1 was involved in reaction with 4‐bromobutyl acetate on heating in DMF in the presence of anhydrous K 2 CO 3 to give tris[2‐(4′‐acetoxybutoxy)phenyl]phosphine oxide ( 2 ) in good yield.…”

“…Molecules of ortho ‐substituted triarylphosphine oxides (2‐RC 6 H 4 ) 3 PO with small substituents (R = OH, Me, CH(Me)NMe 2 , CH=NCHMePh, and CH 2 N(O)Me 2 ) are known to have in crystalline state 3‐UP conformation where these substituents are on the same side as the P=O group (), which is likely to provide minimal internal strain in the molecule. However, 2‐UP conformation is also known for phosphine oxides (2‐RC 6 H 4 ) 3 PO with flexible long‐chain substituents (R = OCH 2 CH 2 OMe and OCH 2 CONBu 2 ).…”

Tripodal Phosphine Oxide Ligand with Tetrazole Functionality

“…The target ligand 1 was prepared in two stages as follows. In the first stage, the reaction of phosphine oxide 3 [30] with 4-bromobutyronitrile in the presence of K 2 CO 3 in anhydrous DMF gave tris[2-(3′-cyanopropoxy) phenyl]phosphine oxide 4 in 96.2% yield (Scheme 2). That compound was isolated as white crystalline powder, readily soluble in organic solvents (CH 2 Cl 2 , CHCl 3 , DMF, DMSO, etc.…”