Patent · US Expired

Process for preparing silylated aromatic acids

US5082959A · kind A · utility

5Cited by
1References
12Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 6, 1990
Grant dateJan 21, 1992
Priority date
Expiry dateSep 6, 2010

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC07F7/1892
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

An improved process is disclosed for preparation of silicon-containing aromatic polyacids by liquid phase oxidation of a silyl compound in the presence of oxygen and a catalyst comprising cobalt-manganese-bromine. 2-Trimethylsilyl-p-xylene is oxidized to 2-trimethylsilyl-terephthalic acid; 5-trimethylsilyl-m-xylene is oxidized to 5-trimethylsilyl-isophthalic acid, 2,5-bis (trimethylsilyl)-p-xylene is oxidized to 2,5-bis (trimethylsilyl)-terephthalic acid; 5-trimethylsilyl-pseudocumene is oxidized to 1,2,4-tricarboxy-5-trimethylsilyl benzene; and 1,3-bis-(p-tolyl)-tetramethyl-disiloxane is oxidized to 1,3-bis(p-carboxyphenyl)-tetramethyl-disiloxane.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.