TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of the compound (III) involves: (a) reacting (in the presence of a strong base) 2 moles of a compound of formula (XV) and (XV') with 1 mole of a di-nitrile compound of formula N?=-A3-?=N; and (b) and then alkylation of compound of formula (A1) obtained in step (a) with a compound R2-X16 under basic conditions in a dry solvent. Preparation of the compound (IIb) involves: (a) reacting (in the presence of a strong base) 2 mole of a disuccinate with 1 mole of a nitrile of formula (A2) and 2 mole of a nitrile of formula A1-?=N; and (b) reacting compound of formula (IX) obtained in step a) with a bromide of the formula R1-X16 in the presence of a suitable base in a suitable solvent; or (a) reacting (in the presence of a strong base) 2 moles of the compound (XV) or (XV') with 1 mole of a di-nitrile compound (A2); (b) reacting the compound (IX) obtained in step a) with a halogenide of formula R2-X16 in the presence of a suitable base in a suitable solvent.R2=R1b;R200 and R'200=1-8C alkyl or benzyl group;X16=halo;R1=R2=R'1=R'2.Preferred Compound: The compound (I) is selected from 2 compounds as given in the specification, e.g. a compound of formula (IIa). The compound (III) is selected from 3 compounds as given in the specification, e.g. a compound of formula (IIIb).R1, R2, R'1 and R'2=1-38C alkyl;Ar5=selected from 15 compounds as given in the specification, e.g. compound of formula (iv).Preferred Components: The polymeric material is selected from group of formula (v) and polymers containing diketopyrrolopyrrole (DPP) repeating units. The polymeric material is a polymer of formula (VII).n'=10-1000;R101 and R102=R1;A6 and A7=aryl or heteroaryl (both optionally substituted);M'=optional, conjugated moiety;s=1-4;t=1-4;u=at least 1;v=0-20;n=at least 5. Full Definitions:    p=0 or 1;    q=0 or 1;    A1 and A2=-(Ar1)a-(Ar2)b-(Ar3)c-R3;    R5, A3, A4 and A5=-(Ar4)k-(Ar5)l-(Ar6)r-(Ar7)z-;    a=1 or 2;    b=0, 1 or 2;    c=0, 1 or 2;    k=0, 1, or 2;    l=1, 2, or 3;    r=0 or 1;    z=0, 1 or 2;    R1, R2, R'1, R'2, R1a, R2a, R1b and R2b=1-100C alkyl, 2-100C alkenyl, 3-100C alkinyl, 3-12C cycloalkyl (all optionally substituted with 1-8C alkyl, 1-8C alkoxy, halo, 5-12C cycloalkyl, nitro, cyano, vinyl, allyl, 6-24C aryl, 2-20C heteroaryl, silyl or siloxanyl and/or optionally interrupted by -O-, -S-, -NR39-, -COO-, -CO- or -OCO-), 6-24C aryl, 2-20C heteroaryl (both optionally substituted with 1-8C alkyl, 1-8C alkoxy, halo, 5-12C cycloalkyl, nitro, cyano, vinyl, allyl, 6-24C aryl, 2-20C heteroaryl, silyl or siloxanyl), H, -CO-1-18C alkyl, -CO-5-12C cycloalkyl, -COO-1-18C alkyl;    R3=H, halo, cyano, 1-25C alkyl (optionally substituted by E' and/or interrupted with D'), -C=C(R14)(R15), COO-1-18C alkyl, 3-12C cycloalkyl (optionally substituted by G'), 2-18C alkenyl, 2-18C alkynyl, 1-18C thioalkoxy, 1-18C alkoxy (optionally substituted by E' and/or interrupted by D'), 7-25C aralkyl (optionally substituted by G'), or R5 or R6;    R5=selected from 11 groups as given in the specification, e.g. group of formula (i);    R6=selected from 6 groups as given in the specification, e.g. group of formula (ii);    Ar1-Ar7=selected from bivalent groups of 33 compounds as given in the specification, e.g. group of formula (iii);    X=-O-, -S-, -NR10-, -Si(R18)(R19)-, -Ge(R18)(R19)-, -C(R12)(R13)-, -C(=O)-, C(=CR14R15)-, group of formula (ia)-(viiia);    R10 and R11=H, 1-18C alkyl, 1-18C haloalkyl, 7-25C arylalkyl, or 1-18C alkanoyl;    R12 and R13=H, 1-18C alkyl, 1-18C haloalkyl, 7-25C arylalkyl, or 6-24 aryl;or    R12+R13=oxo, =C(R14)(R15) or 5-to 6-membered ring (optionally substituted by 1-C alkyl or 1-18C alkoxy);    R14 and R15=H, 1-18C alkyl, 6-24C aryl, 2-20C heteroaryl, -CN or COOR50;    R16 and R17=H, halo, 1-25C alkyl, 1-25C alkoxy, 7-25C arylalkyl, or -?=-R'x;    R'x=1-8C alkyl or tri(1-8C alkyl)silyl;    R18 and R19=H, 1-18C alkyl, 7-25C arylalkyl, or phenyl (optionally mono- to tri-substituted with 1-8C alkyl or 1-8C alkoxy);    R20 and R21=H, 1-25C alkyl, 2-25C alkenyl, 2-25C alkyl which is interrupted by -O- or -S-, COOR50, cyano, 1-18C alkoxy, 6-24C aryl, 7-25C arylalkyl, halo or 2-20C heteroaryl;    R30-R38=H, 1-25C alkyl (optionally interrupted by -O- or -S-), 2-25C alkenyl, COOR50, cyano, 1-18C alkoxy, 6-24C aryl, 7-25C arylalkyl, halo or 2-20C heteroaryl;    R40 and R41=H, 1-25C alkyl (optionally interrupted by -O- or -S-), 2-25C alkenyl, COOR50, cyano, 1-18C alkoxy, 6-24C aryl, 7-25C arylalkyl, halo or 2-20C heteroaryl;    R50=1-25C alkyl, 1-25C haloalkyl, 1-25C arylalkyl, 6-24C aryl or 2-20C heteroaryl;    R60-R68=H, halo, cyano, 1-25C alkyl (optionally substituted by E' or interrupted by D'), 6-24C aryl (optionally substituted by G'), 2-20C heteroaryl (optionally substituted by G'), 3-12C cycloalkyl (optionally substituted by G'), 2-18C alkenyl, 2-18C alkynyl, 1-18C alkoxy (optionally substituted by E' or interrupted by D'), or 7-25C aralkyl (optionally substituted by G');    D'=-CO-, -COO-, -S-, -O-, -NR39-, or -C(=O)NR39-;    E'=1-8C thioalkoxy, COO-1-18C alkyl, 1-18C alkoxy, CN, -NR39R'39, -CONR39R'39, or halo;    G'=E or 1-18C alkyl;    R39 and R'39=H, 1-18C alkyl, 1-18C haloalkyl, 7-25C arylalkyl, or 1-18C alkanoyl.    Where R20 and R21 together represent alkylene or alkenylene which may be both bonded via oxygen or sulfur to the (hetero)aromatic residue and which may both have up to 4 carbon atoms    SPECIFIC COMPOUNDS - Use of 28 compounds are specified as the compound (III), e.g. a compound of formula (I'a); compound of formula (I'b); 6,6'-(2,2'-bithiophene-5,5'-diyl)bis(2,5-dioctyl-3-phenylpyrrolo(3,4-c)pyrrole-1,4(2H,5H)-dione); 6,6'-(2,2'-bithiophene-5,5'-diyl)bis(2,5-bis(3,7-dimethyloctyl)-3-phenylpyrrolo(3,4-c)pyrrole-1,4(2H,5H)-dione); and 6,6'-(2,2'-bithiophene-5,5'-diyl)bis(3-(5-methylthiophen-2-yl)-2,5-dioctylpyrrolo(3,4-c)pyrrole-1,4(2H,5H)-dione).    EXAMPLE - 3-(5-Bromo-thiophen-2-yl)-5-(2-hexyl-decyl)-2-(2-hexyl-octyl)-6-(2,2';5',2'')terthiophen-5-yl-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione (500 mg), 2,5-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)thiophene (85 mg), Pd2(dba)3 (12 mg), and tri-tert-butyl-phosphonium-tetrafluoroborate (7 mg) were suspended under Argon in oxygen free tetrahydrofuran. The mixture was refluxed for 30 minutes and then a degassed solution of K3PO4 (0.32 g) in water (1 ml) were added. The reaction mixture was then refluxed overnight. The reaction mixture was poured on water and after work up, the compound (Ia) was obtained.