TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: An aromatic sulfonic acid ester derivative can be prepared by sulfonation of compound (I) (e.g. a method using acetyl sulfuric acid and sodium hydroxide); chlorination of compound (II) (e.g. a method using phosphoryl chloride); esterification of compound (III) (e.g. a method using i-butylalcohol) to obtain an aromatic sulfonic acid ester derivative (IV).Preferred Components: The aromatic group in the aromatic group having a substituent -SO3Rb is phenyl, naphthyl, anthracenyl, or phenanethyl.Preferred Composition: The polyarylene comprises 0.5-100 mole% of repeating structural units of formula (1') and 0-99.5 mole% of repeating structural units of formula (A).R1-R8 = H, fluorine, alkyl, fluorine substituted alkyl, allyl or aryl;W = divalent electron attractive group;T = divalent organic group;p = 0 or positive integer. Preferred Definitions: (i)    Ra and Rb = 4-20C linear hydrocarbon, branched hydrocarbon, alicyclic hydrocarbon, or hydrocarbon having 5-membered hetero ring;    (ii)    A = -CO-, -CONH-, -(CF2)p,-C(CF3)2-, -COO-, -SO-, or -SO2;    p = 1-10;    B = -O-, -S-, -CH=CH-, -CC-, or compounds of formulae (a) and (b).    EXAMPLE - To a flask was added 2,5-dichloro-4'-phenoxybenzophenone (137.3 g), and 1,2-dichloroethane (1,2-DCE, 500 ml) was added and dissolved. Acetyl sulfuric acid (2M) newly prepared from concentrated sulfuric acid (56 ml), acetic anhydride (152 ml) and 1,2-DCE (400 ml) was added to the solution and reacted in an oil bath at 60 degreesC for 3 hours. The reaction was stopped by adding 1-propanol (300 ml). The solution was concentrated until the volume was 400 ml and sodium hydroxide aqueous solution (120 g/water 400 ml) was added. 1,2-DCE in the solution was distilled off with azeotrope and the transparent pale yellow solution was cooled to obtain a precipitate and the precipitate deposited was filtered. The precipitate was vacuum dried at 70 degreesC and the aimed sodium salt of 4-(4-(2,5-dichlorobenzoylphenoxy)benzene sulfonic acid (A-SO3Na) was obtained as a white fine powder.