TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of compound (I) involves reacting diketopyrrolopyrrole compound of formula (II) with copper(I)cyanide to form compound (I); or reacting diketopyrrolopyrrole compound of formula (IV) with equimolar amount of a diboronic acid or diboronate of formula X11-A2-R13 in a solvent and in the presence of a catalyst, or with an equimolar amount of an organo tin compound of formula X'11-A2-R13 to form compound of formula (III); or reacting diketopyrrolopyrrole compound of formula (VI) with equimolar amount of a diboronic acid or diboronate of formula X11-A2-R13 in a solvent and in the presence of a catalyst, or with an equimolar amount of an organo tin compound of formula X'11-A2-R13 to form compound of formula (V); or reacting diketopyrrolopyrrole compound of formula (VIII) with equimolar amount of a diboronic acid or diboronate of formula X11-A2-R13 in a solvent and in the presence of a catalyst, or with an equimolar amount of an organo tin compound of formula X'11-A2-R13 to form compound of formula (VII).X11=-B(OH)2, -B(OY1)2, group of formula (xi) or (xii);Y1=1-18C alkyl;Y2=1-10C alkylene group, such as -CY3Y4-CY5Y6-, or -CY7Y8-CY9Y10-CY11Y12-;Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y10, Y11 and Y12=H, -C(CH3)2C(CH3)2-, -C(CH3)2CH2C(CH3)2-, or -CH2C(CH3)2CH2-;Y13 and Y14=H, or 1-18C alkyl;X'11=-SnR20R208R209;R20, R208 and R209=H or 1-6C alkyl;A=-(Ar2)b-(Ar3)c-(Ar4)d-;A1=-(Ar3)c-(Ar4)d-;andA2=-(Ar4)d-.Two of groups R20, R208 and R209 form a ring and these groups are optionally branched. Preferred Compound: The compound (I) is selected from 4 compounds as given in specification e.g. compound of formula (II). SPECIFIC COMPOUNDS - 18 Compounds are specifically claimed as compound (I) e.g. 2,5-di(2-ethylhexyl)-3,6-bis(5-cyano-thiophen-2-yl)pyrrolo(3,4-c)-pyrrole-1,4-dione (Ia); 2,5-di-n-butyl-3,6-bis(5-cyano-thiophen-2-yl)pyrrolo(3,4-c)-pyrrole-1,4-dione; 2,5-di-n-pentyl-3,6-bis(5-cyano-thiophen-2-yl)pyrrolo(3,4-c)-pyrrole-1,4-dione; 2,5-di-n-hexyl-3,6-bis(5-cyano-thiophen-2-yl)pyrrolo(3,4-c)-pyrrole-1,4-dione; 2,5-di-n-octyl-3,6-bis(5-cyano-thiophen-2-yl)pyrrolo(3,4-c)-pyrrole-1,4-dione.    EXAMPLE - A mixture of 3,6-bis(5-bromothiophen-2-yl)-2,5-bis(2-ethylhexyl)pyrrolo(3,4-c)pyrrole-1,4(2H,5H)-dione (249 mg) and copper(I)cyanide (1.50 g) in dry dimethylformamide (8 ml) was heated under argon for 8 hours at 130 degrees C. The reaction mixture was allowed to cool down to room temperature and a solution of sodium cyanide (180 g) in water (20 ml) was added. After work-up, 2,5-di(2-ethylhexyl)-3,6-bis(5-cyano-thiophen-2-yl)pyrrolo(3,4-c)-pyrrole-1,4-dione (48.8 mg, yield: 31%) was obtained.