23269-98-9Relevant academic research and scientific papers
Acetic acid mediated synthesis of phosphonate-substituted titanium oxo clusters
Czakler, Matthias,Artner, Christine,Schubert, Ulrich
, p. 2038 - 2045 (2014/05/06)
New phosphonate/acetate-substituted titanium oxo/alkoxo clusters were prepared from Ti(OiPr)4 and bis(trimethylsilyl) phosphonates in the presence of acetic acid, which served to generate water in situ through ester formation. The process led to clusters with a higher degree of condensation than in previously known phosphonate-substituted titanium oxo clusters. The clusters [Ti6O4(OiPr)10(OAc)2(O 3PR)2] (OAc = acetate) were obtained for a large variety of functional and non-functional groups R under a range of reaction conditions. This cluster type, which is also retained in solution, therefore appears to be very robust. Two other clusters, [Ti5O(OiPr)11(OAc)(O 3PCH2CH2CH2Br)3] and [Ti5O3(OiPr)6(OAc)4(O 3P-xylyl)2], were only isolated in special cases. Several acetate/phosphonate-substituted titanium cage compounds were obtained from the reaction of titanium isopropoxide with bis(trimethylsilyl) phosphonates in the presence of acetic acid as water generator.
Acetic acid mediated synthesis of phosphonate-substituted titanium oxo clusters
Czakler, Matthias,Artner, Christine,Schubert, Ulrich
, p. 2038 - 2045 (2015/04/27)
New phosphonate/acetate-substituted titanium oxo/alkoxo clusters were prepared from Ti(OiPr)4 and bis(trimethylsilyl) phosphonates in the presence of acetic acid, which served to generate water in situ through ester formation. The process led to clusters with a higher degree of condensation than in previously known phosphonate-substituted titanium oxo clusters. The clusters [Ti6O4(OiPr)10(OAc)2(O3PR)2] (OAc = acetate) were obtained for a large variety of functional and non-functional groups R under a range of reaction conditions. This cluster type, which is also retained in solution, therefore appears to be very robust. Two other clusters, [Ti5O(OiPr)11(OAc)(O3PCH2CH2CH2Br)3] and [Ti5O3(OiPr)6(OAc)4(O3P-xylyl)2], were only isolated in special cases. Several acetate/phosphonate-substituted titanium cage compounds were obtained from the reaction of titanium isopropoxide with bis(trimethylsilyl) phosphonates in the presence of acetic acid as water generator.
ω-haloalkylphosphoryl compounds: Synthesis and properties
Ragulin
, p. 1928 - 1937 (2013/06/05)
A general method of the synthesis of ω-haloalkylphosphoryl compounds was developed, a series of compounds of phosphonic and phosphine oxide type were synthesized. The ability of some ω-haloalkylphosphonates to undergo intramolecular cyclization into the corresponding 1,2-oxaphospholane and 1,2-oxaphosphorine was investigated depending on the solvent polarity, the presence of halogen ions in the solution, and temperature. Tetrahydrofuran was chosen as one of the most suitable solvents for the alkylation of CH acids with ω-haloalkylphosphoryl compounds.
A free radical approach to functionalization of phosphonates utilizing novel 2- and 3-phosphonyl radicals
Balczewski, Piotr,Pietrzykowski, Witold M.
, p. 13681 - 13694 (2007/10/03)
A general method for the phosphonyl C2-C3-C bond formation under the free radical, reductive conditions is described. The new approach is based on the synthesis of novel 2- and 3-phosphonyl radicals 6, 9 derived from the corresponding 2- and 3-halo (X = Cl, Br, I) substituted phosphonates 7, 10 and their reaction with alkenes 4. Functionalized phosphonates 5, 8 possessing the 2+2 and 3+2 elongated carbon chain were obtained in 24-73% yields.
Synthesis of Phosphonic Acid Esters in Solid-Liquid Catalytic Two-Phase System
Makosza, Mieczyslaw,Wojciechowski, Krzysztof
, p. 175 - 179 (2007/10/02)
Alkylation of dialkyl phosphite anions and their addition to electrophilic alkenes can be efficiently carried out in the presence of anhydrous K2CO3 and tetraalkylammonium or crown ether catalysts (solid-liquid catalytic two-phase systems).
