Derivatives of unsaturated phosphonic acids

Summary The following compounds were synthesized by the reaction of secondary aliphatic amines with 2-alkoxyl-and 2 phenoxy vinylphosphonic dichlorides: the bisdimethylamides of 2-ethoxy-, 2-isopropoxy-, 2-butoxy, and 2 phonoxy vinylphosphonic acids; teh bisdiethylamides of 2-ethoxy-, 2-isopropoxy-, 2-butoxy-, and 2-phenoxyvinylphosphonic acids; the bisdibutylamides of 2-ethoxy-, 2-propoxy-, 2-isopentyloxy-, and 2-phenoxyl-vinyl-phosphonic acids; and the dipiperidides of 2-ethoxy-, 2-butoxy-, and 2-phenoxyl-vinylphosphonic acids.     

Derivatives of unsaturated phosphonic acids

Summary The following compounds were prepared and characterized: 2-(ethylthio)vinylphosphonie and 2-(butylthio)vinylphosphonis dichlorides, dipropyl, dibutyl, diallyl, dihexyl, bis(2-methoxyethyl), and bis(2-ethoxyethyl) 2-(ethylthio)vinylphosphonates; dibutyl, diallyl, and dihexyl 2-(butylthio)vinylphosphonates; and 2-(ethylthio)vinylphosphonic dipiperidide.     

Derivatives of unsaturated phosphonic acids

Russian Chemical Bulletin -     

The chemical bonding in phosphonic acids

The P—O stretching force constants of the phosphonic acids of the type CH_xCl_3-xPO₃H₂, in which x varies from 0 to 3, and their anions are interpreted in terms of (d_π—p_π)—bonding. The behaviour of the P—C stretching force constants in these compounds is also discussed.     

Synthesis of phosphonic monoesters from phosphonous acids

Phosphonic monoesters are prepared in a two—step procedure by DCC—DMAP mediated esterification of phosphonous acids and oxidation of the resulting phosphonous monoester.     

Investigation of thermal decomposition of phosphonic acids

The paper compares building and decomposition pathways of two phosphonic acids, amino trimethylene phosphonic acid (ATMP) and 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP).The theoretical formation reactions were composed using elementary reactions and compared to reaction routes published in literature. As result, summary reaction pathways for both phosphonic acids are proposed which only vary in the number of reaction steps required. These reaction steps include carbonyl reactions, S_N2-reactions, and ionic reactions. The synthesis of ATMP proceeds in three reaction steps, whereas HEDP is formed in one reaction. The thermal decomposition of both phosphonic acids in solid state was examined by combination of thermogravimetry coupled with infrared spectroscopy as well as pyrolysis gas chromatography coupled with mass spectrometry. Decomposition mechanisms were deduced and compared to the theoretical findings resulting in the conclusion that the decomposition processes of ATMP and HEDP follows the formation mechanism.Thus, the suitability of theoretical considerations for the understanding of thermal decomposition processes is shown.     

Polynuclear trivalent metal complexes with phosphonic acids

Summary Polynuclear chromium(III) and iron(III) complexes with hydroxyethylidenediphosphonic acid (H₄L¹), ethylenediphosphonic acid (H₄L²),o-phenylenediamine-N,N-bis(methylenephosphonic acid) (H₄L³), ethylenediamine-N, N, N, N-tetrakis(methylenephosphonic acid) (H₈L⁴) ando-phenylenediamine-N, N, N, N-tetrakis-(methylenephosphonic acid) (H₈L⁵) have been prepared and characterised by elemental analyses, magnetic measurements, i.r., electronic Mössbauer spectra. The compounds are anti-ferromagnetic.     

Amino acids as C-H acids

Conclusions The tetra- and dicyanoethylation products of the sodium bis-(N-salicylideneglycinato)cobaltate(III) complex were isolated and characterized. The condensation of the complex with methyl acrylate and aeetaldehyde respectively leads to the formation of glutamic acid and racemic threonine.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2772–2776, December, 1972.