TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general method for the preparation of (IIA) and (IV) are given.Preferred Components: (I) has molecular weight of less than 1200 g/mol and is belongs to the symmetry group Cs or especially C2h+.(I) is preferably compound of formula (II).X = O, S or NR;R = 1-18C alkyl, 2-18C alkenyl, 2-18C alkynyl or 4-18C aryl (all optionally substituted);)R5-R8 = H; 1-22C alkyl, or 2-22C alkenyl (both optionally interrupted by O, S, COO, OCNR10, OCOO, OCONR10, NR10CNR10 or NR10), 2-18C alkynyl, 4-18C aryl (optionally substituted), halogen, Si(R11)3, X1R12;R10 = H, 1-12C alkyl, or 4-12C cycloalkyl;R11 = 1-20C alkyl or alkoxy;R12 = Si(R11)3, optionally substituted 1-22C alkyl or 4-18C aryl; andR9, R9a, R9b and R9c = R5.Adjacent R9 and R9c and/or adjacent R9a and R9b, together with the connecting carbon atoms, form an annealed phenyl, naphthyl or pyridyl ring; or R5 as optionally substituted phenyl is linked to R9b, and/or R7 as optionally substituted phenyl is linked to R'9, forming a 6-membered ring structure with R9b and/or R9c being X; and the saturated carbons also optionally substituted by oxo (=O). Preferred Definitions:    X=O or S;    R5-R8=H, 1-18C alkyl, 1-8C alkoxy (both optionally substituted by T1), ethynyl (substituted by T1), phenyl, naphthyl, pyridyl, chinolyl (all optionally substituted by T1), halogen or Si(R11)3;    T1 = 1-18C alkoxy, 1-18C alkyl, cyclohexyloxy, cyclopentyloxy, cyclohexyl, cyclopentyl, halogen, phenyl, naphthyl;    R11 = methyl, ethyl, propyl, methoxy, ethoxy or propoxy;    Ra = 1-18C alkyl or optionally substituted phenyl, naphthyl, pyridyl, tetrahydronaphthyl, furyl, thienyl, pyrryl, chinolyl, isochinolyl, anthrachinyl, anthracyl, phenanthryl, pyrenyl, benzothiazolyl, benzoisothiazolyl, benzothienyl;and    R5a-R8a = H; optionally substituted 1-18C alkyl or 1-18C alkoxy (each of which is optionally interrupted by O, S, or NR10); substituted ethynyl; optionally substituted phenyl, naphthyl, pyridyl, tetrahydronaphthyl, furyl, thienyl, pyrryl, chinolyl, isochinolyl, anthrachinyl, anthracyl, phenanthryl, pyrenyl, benzothiazolyl, benzoisothiazolyl, benzothienyl; halogen; Si(R11)3.    SPECIFIC COMPOUNDS - 7,14-Diphenyl-5,12-dithia-pentacene, 2,9-dibromo-7,14-bis-(4-(1-hexyl-heptyl)-phenyl)-5,12-dithia-pentacene, 5,12-dithia-pentacene and compounds of formulas (IVA) and (IVB) are specifically claimed as (IIA) or (IV).    EXAMPLE - A mixture of 7,14-diphenyl-7,14-dihydro-5,12-dithia-pentacene (8 g) and chloranil (3 g) was heated in ortho-dichlorobenzene (70 ml) to 150 degrees C for one hour. After cooling to 22 degrees C, the product was filtered off and washed with ortho-dichlorobenzene (30 ml), twice with toluene (15 ml) and finally with ethanol (30 ml). After drying 7,14-diphenyl-5,12-dithia-pentacene (5.9 g, melting point 320 degrees C) was obtained as dark violet crystals.