V. V. Tkachev

Molecular and crystal structure of phenyl[1-chloro-1-(p-methoxyphenyl)jethylphosphinic acid C6H5[4-CH3OC6H4C(Cl)(CH3)]P(O)OH

Conclusions1.X-ray diffraction analysis has shown that the intermediates in the Conant reaction with some aromatic aldehydes and ketones are α-chlorophosphinic acids.2.The molecules of the α-chlorophosphinic acid studied here are associated into chains by intermolecular hydrogen bonding in the crystal.

Phosphorus crowns. Communication 8. The molecular structure and complexation properties of phenylphosphonyldibenzo-17-crown-6

Conclusions1.The stability constants were determined for the complexes of 17-membered phosphorus-containing crown ethers in the series of Li, Na, K, Ca, and Mg picrates in methylene chloride and the size of the macrocyclic ring was found to have a significant effect on the complexing capacity of phosphorus polyethers.2.An x-ray diffraction structural analysis showed that the replacement of an adamantyl group by a phenyl substituent did not lead to a rearrangement of the macrocycle such that the phosphoryl oxygen atom could participate in coordination simultaneously with the anisole and ether oxygen atoms.

Molecular and crystal structure of the acid chloride of phenyl-α-hydroxycyclohexylphosphinic acid, C6H5(cyclo-C6H10OH)P(O)Cl

Conclusions1.X-ray diffraction crystallographic analysis gave the first unequivocal proof for the structure of a Conant reaction intermediate, namely, the acid chloride of phenyl-α-hydroxycyclohexylphosphinic acid.2.The crystals of this acid chloride consist of molecules with transoid conformation relative to the P-C bond of the HO-C-P=O fragment associated by hydrogen bonds.

Structure of phenyl-α-hydroxycyclohexylphosphinic chloride C6H5(C6H10OH)P(O)Cl

Conclusions1.The geometry of the molecule of the acid chloride of phenyl-α-hydroxycyclohexylphosphinic acid, C6H5(C6H10OH)P(O)Cl, was established.2.The central fragment HO-C-P=O of the molecule has a transoid conformation.

Structural features of complex of triphenylphosphine oxide with nitric acid

Conclusions1.An x-ray structural study has been performed on the complex Ph3PO·HNO3, and its IR spectra have been examined.2.In the crystalline state, a molecular complex is realized, with a strong, forked H-bond.3.The properties of the complex change very markedly when there is a change in the state of aggregation or replacement of the solvent; this is related to the easy polarizability of the bonds in the NO3 fragment.