Synthesis of 4,4′-bis(dialkoxyphosphoryl)biphenyl-18-crown-6

Reaction of rhodium trichloride and dirhodium(II) acetate with trans-4,4′-bis(diethoxyphosphoryl)biphenyl-18-crown-6

“…The compounds L and II were prepared according to [5,41]. Solvents were purified and dried by standard techniques just before use.…”

“…The main characteristics of the non-coordinated ligand have been described in [5]. In a number of works [6, 7] the reactivity has been studied of certain types of crown ethers with compounds of platinum group metals, however, in the literature we have not found any information on the conditions of complexation of the ligand L with the compounds of rhodium(III) or dirodium(II).…”

“…The 1 H NMR spectrum of compound L in CDCl 3 , according to [5], has the following characteristics (δ, ppm): 1.09 t (12H, OCH 2 CH 3 ), 3.69 m (8H, OCH 2 CH 3 ), 3.75 m (8H, OCH 2 ), 3.89 m (8H, OCH 2 ), 6.98 d, 7.25 d.d, 7.40 d.d (2H, ArH). The signals in the 1 H NMR spectrum of the product III were assigned using the data of 1 H and 1 H-{ 31 P} NMR spectroscopy.…”

“…The compounds were characterized by NMR, IR, Raman, ESR, X-ray electron spectroscopy, conductivity, and the data of elemental and X-ray fluorescence analyses. The predominant role of diethoxyphosphoryl groups at the macrocycle in binding rhodium(III) and dirhodium(II) ions was demonstrated.There is a great interest nowadays in a modified type of macrocyclic polyethers containing a variety of additional groups that supply the polyester cycle with a number of useful properties, such as changing the hydrophilic and surfactant properties of polyesters [1], improve the complexing properties towards transition metal cations [2].In this work, continuing a series of research on the interaction of transition elements with macrocyclic compounds, we studied the complexing ability of RhCl 3 ·3H 2 O (I) and [RH 2 (CH 3 COO) 4 ·2H 2 O] (II) with a derivative of dibenzo-18-crown-6 (DB-18-CR-6) containing two diethoxyphosphoryl groups as substituents in the benzene rings in the trans position, the trans-4,4'-bis(diethoxyphosphoryl)biphenyl-18-crown-6 (L) [3][4][5].The main characteristics of the non-coordinated ligand have been described in [5]. In a number of works [6, 7] the reactivity has been studied of certain types of crown ethers with compounds of platinum group metals, however, in the literature we have not found any information on the conditions of complexation of the ligand L with the compounds of rhodium(III) or dirodium(II).…”

“…In this work, continuing a series of research on the interaction of transition elements with macrocyclic compounds, we studied the complexing ability of RhCl 3 ·3H 2 O (I) and [RH 2 (CH 3 COO) 4 ·2H 2 O] (II) with a derivative of dibenzo-18-crown-6 (DB-18-CR-6) containing two diethoxyphosphoryl groups as substituents in the benzene rings in the trans position, the trans-4,4'-bis(diethoxyphosphoryl)biphenyl-18-crown-6 (L) [3][4][5].…”