TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of the compound (I) involves:(1) process (A): a) treating a dichlorosilane of formula SiCl2R2 with a solution of R'MgBr (where R is a first alkyl group and R' is an alkenyl group or second alkyl group that is different from the first alkyl group), to yield a chlorosilane of the formula SiClR2R' (i); b) reacting the chlorosilane (i) with Li-C?=C-Si(R1a)3 (ii) (where R1a is alkyl e.g. methyl), to yield the corresponding protected silane of the formula (R1a)3Si-C?=C-SiR2R' (iii); c) deprotecting the protected silane (iii) (e.g. by treatment with potassium carbonate), to afford the unprotected silane of the formula H-C?=C-SiR2R' (iv); d) alternatively to steps b) and c), treating the chlorosilane (i) from step a) with ethynylmagnesium halide or lithium acetylide to afford the unprotected silane (iv) directly; e) lithiating the silane (iv) from step c) or d), e.g. with n-butyllithium, to provide the lithium silylacetylide of the formula Li-C?=C-SiR2R' (v); f)reacting the lithium silylacetylide (v) from step e) with dithienoanthraquinone, which is optionally substituted in 2-and/or 8-position by R1 and/or R2, to yield the corresponding diol; g) reacting the diol from step f) with a reducing reagent, e.g. SnCl2, under acidic conditions to afford the anthra(2,3-b:7,6-b)dithiophene, which is substituted by -C?=C-SiR2R' groups in 5- and 11-position and optionally substituted by R1 and/or R2 in 2- and/or 8-position; or(2) process (B): a1) reacting 2,3-thiophenedicarboxaldehyde diacetal with alkyllithium, lithium diisopropylamide (LDA) or another lithiation reagent, and then reacting the resulting compound with a halogenation agent (including carbon tetrachloride, 1,2-dichloroethane, carbon tetrabromide, 1,2-dibromotetrachloroethane, 1,2-dibromoethane, 1-iodoperfluorohexane, iodinechloride or elemental iodine), to afford the 5-halogenated 2,3-thiophenedicarboxaldehyde diacetal; b1) deprotecting the 5-halogenated 2,3-thiophenedicarboxaldehyde diacetal from step a1) under acidic conditions to the corresponding dialdehyde, which is then condensed with a cyclic 1,4-diketone, such as 1,4-cyclohexadione, 1,4-dihydroxy-naphthalene or its higher analogues, to yield the quinone of the dihalogenated acenodithiophene; c1) treating the quinone of the dihalogenated acenodithiophene from step b1) with a lithium silylacetylide (v) (which is e.g. obtainable by a process as described above), followed by a hydrolysis e.g. with diluted HCl, to yield the dihalogenated diol intermediate; d1) cross-coupling the dihalogenated diol intermediate from step c1) with a corresponding heteroaryl boronic acid, boronic ester, stannane, zinc halide or magnesium halide, in the presence of a nickel or palladium complex as catalyst, to yield the heteroaryl extended diol, e1) reacting the heteroaryl extended diol from step d1) with a reducing agent, e.g. SnCl2, under acidic conditions to afford the 2,8-diheteroaryl-anthra(2,3-b:7,6-b)dithiophene which is substituted by -C?=C-SiR2R' groups in 5 and 11-position, or f1) alternatively to steps b1)-e1), reacting the 5-halogenated 2,3-thiophenedicarbox-aldehyde diacetal obtained by step a1) in a cross-coupling reaction with a corresponding heteroaryl boronic acid, boronic ester, stannane, zinc halide or magnesium halide, in the presence of a nickel or palladium complex as catalyst, deprotecting the resulting product and condensing with a cyclic 1,4-diketone as described in step b1), treating the resulting product with the lithium silylacetylide (v) followed by hydrolysis as described in step c1), and aromatizing the resulting 2,8-diheteroaryl extended diol by reacting it with a reducing agent as described in step e1), to afford the 2,8-diheteroaryl-anthra(2,3-b:7,6-b')dithiophene which is substituted by -C?=C-SiR2R' groups in 5 and 11-position.Preferred Compound: The compound (I) is mixture of isomers, where in the first isomer Y1=Y3 and Y2=Y4, and in the second isomer Y1=Y4 and Y2=Y3. Preferred Definitions:    X=S;    n,m=1;    R,R',R1a=1-10C alkyl or 1-10C alkoxy (both optionally substituted) (preferably methyl, ethyl, n-propyl, isopropyl, cyclopropyl, 2,3-dimethylcyclopropyl, 2,2,3,3-tetramethylcyclopropyl, cyclobutyl, cyclopentyl, methoxy or ethoxy), 2-12C alkenyl, 1-12C alkynyl or 1-12C alkylcarbonyl (all optionally substituted) (preferably allyl, isopropenyl, 2-but-1-enyl, cis-2-but-2-enyl, 3-but-1-enyl, propynyl or acetyl), 5-10C (hetero)aryl, 5-10C (hetero)arylalkyl or 5-10C (hetero)aryloxy (all optionally substituted) (preferably phenyl, p-tolyl, benzyl, 2-furanyl, 2-thienyl, 2-selenophenyl, N-methylpyrrol-2-yl or phenoxy);    R1,R2=furan, thiophene, selenophene, N-pyrrole, pyrimidine, thiazole, thiadiazole, oxazole, oxadiazole, selenazole, bi-, tri- or tetracyclic groups (containing at least one of the rings and optionally containing at least one benzene ring, and where the individual rings are connected by single bonds or fused with each other), thieno(3,2-b)thiophene, dithieno(3,2-6:2',3'-d)thiophene, selenopheno(3,2-b)selenophene-2,5-diyl, selenopheno(2,3-b)selenophene-2,5-diyl, selenopheno(3,2-b)thiophene-2,5-diyl, selenopheno(2,3-b)thiophene-2,5-diyl, benzo(1,2-b:4,5-b')dithiophene-2,6-diyl, 2,2-dithiophene, 2,2-diselenophene, dithieno(3,2-6:2',3'-d)silole-5,5-diyl, 4H-cyclopenta(2,1-b:3,4-b')dithiophene-2,6-diyl, benzo(b)thiophene, benzo(b) selenophene, benzooxazole, benzothiazole, benzoselenazole (all optionally substituted by L1).    SPECIFIC COMPOUNDS - 16 Compounds are disclosed as the compound (I) e.g. 2.8-difluoro-5,11-bis(allyldiisopropylsilylethynyl)anthradithiophene; 2,8-difluoro-5,11-bis(cyclohexyldimethylsilylethynyl)anthradithiophene; 2,8-difluoro-5,11-bis(tert-butyldimethylsilylethynyl)anthradithiophene; 2,8-difluoro-5,11-bis(allyldiethylsilylethynyl)anthradithiophene and 2,8-difluoro-5,11-bis(2-butyldiethylsilylethynyl)anthradithiophene.    EXAMPLE - A solution of dichlorodiisopropylsilane (9.55 g) in anhydrous tetrahydrofuran (THF) (50 cm3) was cooled to -78 degrees C. Allylmagnesium bromide solution (1 mol/l, 60 cm3) was added dropwise for 1 hour to yield a thick white suspension. The suspension was stirred at -78 degrees C for 2 hours. The cooling bath was removed and the suspension was stirred without cooling for an additional 1.5 hours. Lithium trimethylsilylacetylide solution (1 M in THF, prepared by reacting trimethylsilylacetylene with n-BuLi) was added at 23 degrees C rapidly. The previous suspension became a clear solution after the addition. The reaction mixture was stirred at 50 degrees C for 1 hour then stirred at 23 degrees C for 15 hours. After workup, allyldiisopropyltrimethylsilylethynylsilane (A1) was obtained. To a solution of (A1) (6.04 g) in dichloromethane (20 cm3) and methanol (20 cm3) was added manually powdered potassium carbonate (5.8 g). The reaction mixture was stirred at 23 degrees C for 1 hour before filtering through a silica pad. After workup, ethynylallyldiisopropylsilane (A2) was obtained. To a solution of (A2) (3 g) in dioxane (30 cm3) was added 2.5M n-BuLi in hexanes (6.66 cm3) dropwise at 0 degrees C for 10 minutes. The cooling bath was removed and the reaction was stirred at 23 degrees C for 30 minutes to afford a colorless clear solution. 2,8-Difluoroanthradithiophene-5,11-dione (1.95 g) was added in one portion to the lithium acetylide solution and the reaction mixture was stirred at 23 degrees C for 16 hours and then at 60 degrees C for an additional 1 hour before cooling to 23 degrees C. A mixture of iced cold 5% HCl (14 cm3) was added. After workup, 2,8-difluoro-5,11-bis(allyldiisopropylsilylethynyl)anthradithiophene (A3) (1.94 g, 97%) was obtained. The compound (A3) was used for fabricating top-gate thin-film organic field-effect transistors and mobility was measured and found to be 0.5 cm2/Vs.