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- W4234314358 abstract "High yields of bis-(dialkoxyphosphonyl-methyl)- phosphinic esters, (RO)2 (O)-PCH2P(O)OR, bis-(aloxyphosphinyl-methyl)-phosphinic esters, [R(RO)(O)PCH2]2P(O)OR, are obtained by heating bis-chloromethyl-phosphinic esters, (CICH2)2P(O)OR, with alkylphoshites, phosphonites and phosphinites, repectively, at 170 to 180°C for several hours. Hydrolysis of these esters in achieved by refluxing with conc. HCl for extended periods. Bis-(dihydroxyphosphonyl-methyl)-phosphinic acid, HO(O)P[CH2P(O) (OH)2]2, obtained by hydrolysis of the all-ethyl ester, titrates in aqueous solution as a tetrabasic acid with breaks at pH = 5,2 (three equivalents) and at pH = 8,8 (one equivalent). The fifth proton can be titrated only after addition of NaCl. This acid is an excellent chelating agent for metal ions. The 1H- and 31P-NMR. spectra of all the compounds prepared are discussed." @default.
- W4234314358 created "2022-05-12" @default.
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- W4234314358 date "1969-01-01" @default.
- W4234314358 modified "2023-10-18" @default.
- W4234314358 title "Organische Phosphorverbindungen XXXVI. Darstellung und Eigenschaften von Bis-(dialkoxyphosphonyl-methyl)-, Bis-(alkoxyphosphinyl-methyl)-und Bis-(oxophosphoranyl-methyl)-phosphinsäureestern sowie der entsprechenden Säuren [1]" @default.
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- W4234314358 doi "https://doi.org/10.1002/hlca.19690520335" @default.
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