C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 63/331 (2006.01) C07C 51/265 (2006.01) C07C 63/72 (2006.01) C07C 65/24 (2006.01) C07C 67/313 (2006.01) C07C 69/76 (2006.01) C07C 201/12 (2006.01) C07C 205/57 (2006.01)
Patent
CA 2140027
2140027 9404481 PCTABS00030 Provided is a process for preparing 2,5-diphenylterephthalic acid, which is useful in preparing certain polyesters, especially liquid-crystalline polyesters. In this process, p-xylene is di-alkylated with cyclohexene to provide 2,5-dicyclo-hexyl-p-xylene, which is in turn dehydrogenated to provide 2,5-diphenylxylene. 2,5-Diphenylxylene is then oxidized to provide 2,5-diphenylterephthalic acid by utilization of a cobaltous/manganous/bromide oxidation system.
Arnold Ernest W. III
Fugate Eric J.
Fuller Dewey W. Jr.
Gustafson Bruce L.
Sumner Charles E. Jr.
Eastman Chemical Company
Gowling Lafleur Henderson Llp
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