TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The organic thin-film transistor comprises a pair of a first electrode and a second electrode, an organic semiconductor layer (1) disposed between the first electrode and the second electrode, and a third electrode which controls a current running through the organic semiconductor layer when a voltage is applied. The organic thin-film transistor further comprises an insulating film (5) between the third electrode and the organic semiconductor layer. The display pixel is a liquid crystal element, an electroluminescence element, an electrochromic element or an electrophoretic element. The substrate is coated with the coating liquid by inkjet coating, spin coating, solution casting or dip coating.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): Preparation of (I) comprises treating substituted phenol of formula (VI) with a base and a carboxylic anhydride, a carboxylic chloride or carbonate half esters (e.g. alkyl chloroformate) to form substituted acylated phenol of formula (VII) (representative of (I)). Preferred Components: (A) is at least one pi -electron conjugated compound which is (a) compounds in which at least one aromatic hydrocarbon ring is ring-fused with at least one aromatic heterocyclic ring, compounds in which at least two aromatic hydrocarbon ring is ring-fused together, and compounds in which at least two aromatic heterocyclic rings are ring-fused together; and (b) compounds in which at least one aromatic hydrocarbon ring is linked via a covalent bond with at least one aromatic heterocyclic ring, compounds in which at least two aromatic hydrocarbon rings are linked together via a covalent bond, and compounds in which at least two aromatic heterocyclic rings are linked together via a covalent bond. (III) includes a hydrogen halide, optionally substituted carboxylic acid, alcohol or carbon dioxide. (IV) has a solvent solubility and (V) has a solvent insolubility. Preferred Definitions:    Either X, Y1 = optionally substituted ether or acyloxy having at least 1C; or    one of X and Y1 = optionally substituted ether or acyloxy having at least 1C, or H; and either    at least one pair of (Q1, Q2), (Q2, Q3), (Q3, Q4), (Q4, Q5) or (Q5, Q6) = ring structure having a substituent; or    at least one pair of (Q2, Q3), (Q3, Q4) or (Q4, Q5) = ring structure which may have a substituent (where the ring structure is an aryl or a heteroaryl).    Provided that one of the pairs further forms a ring structure together with adjacent another pair or adjacent other pairs.    SPECIFIC COMPOUNDS - 42 Compounds (I) are disclosed e.g. isobutyric acid 8-isobutyryl oxy-1,2,8,9-tetrahydro-pentacen-1-yl ester of formula (Ia), propionic acid 1,2-dihydro-naphthacen-2-yl ester, hexanoic acid 1,2-dihydro-pentacen-1-yl ester, butyric acid 7-(7-(8-butyryloxy-7,8-dihydro-naphthalen-2-yl)-pyren-2-yl)-1,2-dihydro-naphthalen-1-yl ester and propionic acid 5''-propionyl-5,6,5'',6''-tetrahydro-(2,2';6',2'')ternaphthalen-5-yl ester.    EXAMPLE - Three-neck flask (200 ml) was charged with 2,6-bis-trimethylstannyl-benzo(1,2-b;4,5-b')dithiophene (2.58 g), (2-bromo-phenyl)-acetic acid methyl ester (2.52 g) and toluene (100 ml). The resultant mixture was bubbled with argon gas for 30 minutes. Tris(dibenzylideneacetone)dipalladium(0) (229 mg) and tri(ortho tolyl)phosphine (304 mg) were added to the mixture, followed by refluxing for 8 hours in an argon atmosphere. The reaction solution was filtrated with a silica gel pad (thickness of 3 cm). The filtrate was concentrated to obtain a brown solid. The obtained solid was recrystallized from toluene to obtain (2-(6-(2-methoxycarbonyl methyl-phenyl)-benzo(1,2-b;4,5-b')dithiophen-2-yl)-phenyl)-acetic acid methyl ester as pale yellow crystals (1.85 g).