| 主权项 |
1. A composition for preparing aryl carboxylic acid; said composition comprising:
i. at least one ionic liquid of formula I, in an amount of 0.05 to 50% of the total mass of the composition;
[Ar—Z-Q{circle around (+)}-R]A{circle around (−)} Formula I wherein,
Ar is substituted or un-substituted aryl group,Z is (CH2)n, wherein n is an integer from 0 to 10,Q+ is an organic cation selected from the group consisting of quaternary ammonium, cholinium, sulfonium, phosphonium, guanidinium, imidazolium, pyridinium, pyrrolidinium, morpholinium, quinolinium, isoquinolium, pyrazolium and piperidinium;R is C1 to C20 linear or branched alkyl group or Ar—Z,A− is an anion selected from the group consisting of chlorides, bromides, fluorides, iodides, mesylates, tosylates, sulfates, alkyl sulfonates, phosphates, phosphonates, akyl phosphates, nitrates, nitrites, carbonates, acetates, bicarbonates, hydroxides and oxides; ii. at least one catalyst, in an amount of 0.01 to 5% of the total mass of the composition; iii. at least one non-oxidizable polar solvent; and iv. at least one oxidizable multi-alkylated arylene compound with no two successive ring positions bearing alkyl group, said composition when used in the preparation of aryl carboxylic acid results in the formation of less than 4000 ppm of partially oxidized derivatives of said multi-alkylated arylene compound; said derivatives comprising at least one carboxylic acid moiety and at least one aldehyde moiety. |
