Propanephosphonic

Yamazaki, S., Imanishi, T., Moriguchi, Y, and Takada, T., Highly efficient 2 -t- 1] cycloaddition reactions of a l-seleno-2-silylethene to 2-phosphonoacrylates. Synthesis of novel functionahzed cyclo-propanephosphonic acid esters. Tetrahedron Lett., 38, 6397, 1997. 

DHPM derivatives 250 bearing a phosphoryl moiety at C-5 are obtained when 0,0-dialkyl-2-oxo-propanephosphonates 249 reacts with urea and an aldehyde (Scheme 96) (03HAC13). 

Synthesis of a water-soluble, phosphonic acid derivatized, polythiophene, poly(3-(3 -thienyloxy)propanephosphonate) has been reported by Viinikanoja et al. [55]. The polymerizations of both 3-(3 -thienyloxy) propanephosphonic acid and its sodium salt were unsuccessful however an ethyl ester form was electropolymerized in 0.1 M lithium perchlorate/acetonitrilerdichloromethane (1 1) at 1.8 V vs sodium SCE. 

Figure 4.38 Absorption spectra of poly(3-(3 -thienyloxy)propanephosphonate) solutions (40jiM) at different pH 13.0, 12.1, 11.0, 10.0, 9.0, 8.1, 7.1, 6.1, 5.0, 4.0, and 3.2. Inset shows the difference spectra at selected pH (12.1, 10.0, 6.1 and 3.2) vs pH 13.0. (Reprinted with permission from Langmuir, 19, 276. Copyright (2003) American Chemical Society.)...

Figure 4.39 A proposed mechanism for the self-acid-doping of poly(3-(3 -thienyl-oxy)propanephosphonate). (Reprinted with permission from Langmuir, 19, 2768. Copyright (2003) American Chemical Society.)...

Example 11 Polythiophene-Phosphonic Acid - Synthesis of Poly(3-(3 -thieny-loxy)propanephosphonate) (P3TOPP)... 

As a typical example for an anion-exchange separation of an organic acid under isocratic conditions. Figure 10.290 shows the analysis of propanephosphonic acid... 

Figure 10.290 Analysis of propanephosphonic acid in a wash solution of a crystalline intermediate by anion-exchange chromatography. Separator column lonPac AS14A, 5 pm column dimensions ISO mm x 3 mm i.d. eluent ...

Propanephosphonic anhydride (440) has been demonstrated to be an efficient activator for the chemoselective acetalisation and thioacetali-sation of aldehydes in the presence of ketones. Thus, cyclic and acyclic acetals (443) and thioacetals (444) were obtained in excellent yields (89-96%) at room temperature in the presence of a catal)ffic amount of (440) (Scheme 152). ... 

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