Optimiertes Verfahren zur Darstellung anellierter, polycyclischer und polyheterocyclischer Aromaten

DE 102005058270 B3 UPAB: 20070727 NOVELTY - Preparation of annealed carbo- or heterocyclic aromatic compound comprises reacting a dione compound (I) with lithium aluminum hydride, sodium borohydride or borontrifluoride (as reducing agents) in the presence of an organic solvent under an inert gas at 32-120degreesC; reacting the unreacted reducing agents with an acid derivative and isolating the obtained antharacene compound (II), where the molar ratio of dione and reducing agent is 1:3-1:6. DETAILED DESCRIPTION - Preparation of annealed carbo- or hetero- cyclic aromatic compound comprises reacting a dione compound of formula (I) with lithium aluminum hydride, sodium borohydride or borontrifluoride (as reducing agents) in the presence of an organic solvent under an inert gas at 32-120degreesC; reacting the unreacted reducing agents with an acid derivative and isolating the obtained anthracene compound of formula (II), where the molar ratio of dione and reducing agent is 1:3-1:6. (DE510058270B3-001.skc) Either R = H, 1-18C-alkyl, 1-18C-alkoxy, 2-8C-alkenyl, 2-8C-alkynyl, 3-8C-cycloalkyl, 5-8C-aryl, arylalkyl, alkylaryl, arylalkenyl, alkenylaryl, arylalkynyl, alkynylaryl or acyloxy (all substituted with heteroatom such as O, S or N, or halo); or R+adjacent group = aromatic carbo- or hetero- cyclic ring; and n = 1-4. USE - The annealed carbo- or hetero- cyclic aromatic compound is useful as organic semiconductors in transistors and circuits (claimed). ADVANTAGE - The process consumes less amount of organic solvents and power, hence economical and eco-friendly. The process provides annealed carbo- or hetero- cyclic aromatic compound with high yield (up to 80%)