A. N. Bovin

Synthesis and structure of 1-substituted 1-Oxo-1,2-dihydro-4H-3,1-benzoxaphosphorins

Abstract1-X-1-Oxo-1,2-dihydro-4H-3,1-benzoxaphosphorins (X = CH2Cl, Ph, and OH) were obtained by reacting ortho-(butoxymethoxymethyl)phenylmagnesium bromide with derivatives of chloromethylphosphonic and chloromethylphosphinic acids, followed by intramolecular alkylation. X-Ray diffraction was used to study the molecular and crystalline structure of one of these compounds (with X = OH).

Effect of a catechol segment in a polyether chain on the complexing ability of some phosphonate and quinoline monopodands

The complexing ability of monopodands with o-diethoxyphosphinylmethoxyphenyl and 8-quinoline end groups, containing both ethylene glycol and catechol units in the polyether chain, was studied by conductimetry in tetrahydrofuran-CHCl3. Replacement of ethvlene glycol by catechol changes the efficiency insignificantly, but in a number of cases leads to some increase in K/Li and k/Na selectivity of phosphonate podands, and the K/Li and Na/Li selectivity of quinoline podands.

Molecular and crystal structure of 2H-3,4-dihydro-3-hydroxy-3-oxo-1,5,3-benzodioxaphosphepine

ConclusionsAn x-ray diffraction structural analysis was carried out for 2H-3,4-dihydro-3-hydroxy-3-oxo-1,5,3-benzodioxaphosphepine and the seven-membered heterocycle in this molecule was found to have chair conformation with an axial OH group.

Synthesis and structure of thetrans-isomer of dimeric 2-(0-aminophenoxymethyl)-2-chloromethyl-1,3,2-benzoxazaphosphole

A synthesis of the title compound and its structural characteristics are reported. The molecular structure of the dimer has been determined by means of the X-ray study of its crystalline benzene solvate.

Structure of 2-chloromethyl-2λ5-2,2′(3h,3′h)-spirobis[1,3,2- benzoxazaphosphole]

In 2-chloromethyl-2λ5-2,2′(3H,3′H)-spirobis[1,3,2-benzoxazaphosphole], which has been investigated by x-ray diffraction, the P atom has a distorted trigonal-bipyramidal coordination with O atoms in axial positions; the angle between the two planes of the 3H-1,3,2-benzoxazaphosphole fragments is 128.8°.

Phosphorus-containing podands: 3. Effect of the length of the polyether chain of bis (ortho-(diethoxyphosphinylmethoxy)phenyl) ethers of oligoethylene glycols on their complexing ability towards alkali metal cations

Conclusions1.Using a conductometric method in a mixed THF-CHCl3 solvent, the complex-forming abilities of bis(ortho-(diethoxyphosphinylmethoxy)phenyl) ethers of oligoethylene glycols towards alkali metal cations have been studied. Complex-forming ability towards Li+, Na+, K+, and Rb+ cations depends very much on the length of the polyether chain. In the case of the Cs+ cation the effectiveness increases monotonically with increase in the number of ethylene glycol units.2.The complex-forming abilities of the higher members of the series of podands studied — bis(ortho-(diethoxyphosphinylmethoxy)phenyl) ethers of tetraethylene glycol and pentaethylene glycol — towards K+, Rb+, and Cs+ cations are comparable with, and in some cases exceed, those for 18-crown-6 and dibenzo-18-crown-6.3.The enhanced effectiveness of the present class of podands (in comparison with podands with ortho-diethoxyphosphinylphenyl terminal groups) towards alkali metal cations of greater radius (K+, Rb+, Cs+) is explained by the participation of the O atom located at the α-position to the phosphoryl group in the coordination.

Molecular and crystal structure of 2-phenoxy-2λ5-2,2′(3H,3′H)-spirobi[1,3,2-benzoxazaphosphole]

The crystal and molecular structure of 2-phenoxy-2λ5-2,2′(3H,3′H)-spirobi[1,3,2-benzoxazaphosphole] has been determined using X-ray diffraction structure analysis. The P atom in the molecule in question has a distorted trigonal bipyramidal coordination, with the bond lengths P-Oax=1.701(1) and 1.700(1) Å, P-Oeq (Ph)=1.625 Å, P-Neq=1.654(2) and 1.645(1) Å, and bond angles (O-P-O)ax=175.69(7)° and (N-P-N)eq = 132.38(7)°.

Crystal and molecular structure of 1-chloromethyl-1-oxo-1,3-dihydro-2,1-benzoxaphosphole

The crystal and molecular structure of 1-chloromethyl-1-oxo-1,3-dihydro-2,1-benzoxaphosphole was determined by x-ray diffraction structural analysis. This compound has an almost planar bicyclic unit with extruding phosphorus atoms and atrans Cl-C-P=O fragment.

Crystal structure of the benzene disolvate of the cis isomer of the 2-chloromethyl-2-phenyl-1,3,2-benzoxazaphosphole dimer

The x-ray crystal and molecular structure of the benzene disolvate of the “soluble” diastereomer of the 2-chloromethyl-2-phenyl-1,3,2-benzoxazaphosphole dimer is solved. This diastereomer is the cis isomer.

The structure and a new method for the synthesis of the dimer of 2,2-diphenyl-1,3,2-benzoxazaphosphole

X-ray diffraction structural analysis established the structure of the dimer of 2,2-diphenyl-1,3,2-benzoxazaphosphole with a pentacoordinated phosphorus atom. A new method is proposed for the preparation of this dimer.