title: Synthesis of octacarboxy spherosilicate.
abstract: feasible new preparation was reported for an octacarboxylphenyl functionalized spherosilicate, octakis[(pcarboxyphenyl) dimethylsilyl]silicate, which was a versatile monomer leading to other functional spherosilicate derivatives. The synthesis was started from octakis[dimethyl(p-methylphenyl)silyl]silicate. Octakis[dimethyl(pmethylphenyl) silyl]silicate was brominated by NBS to produce octakis[dimethyl(4-tribromomethylphenyl)silyl]silicate. Finally, octakis[dimethyl(4-tribromomethylphenyl)silyl]silicate was hydrolyzed in the presence of AgNO3 and formic acid to give the desired compound. Octakis[(pcarboxyphenyl) dimethylsilyl]silicate was fully characterized by FTIR, 1H NMR, 13C NMR, 29Si NMR spectra, ESI-MS, and elemental analysis.
authors.affiliation: Advanced Technology Research Center (ATEC), Gunma University, Kiryu, Gunma 376-8515, Japan. liu-hongzhi@hotmail.com
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Liu
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Kondo
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Takeda
authors.forename: Masafumi
authors.initials: M
authors.lastname: Unno