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NOVELTY - An aromatic compound is prepared by exposing pre-formed benzenoid or other organic compound to an energy source in the presence of a catalyst system. USE - For preparing an aromatic compound (e.g. 1-chloronaphthalene) useful for pharmaceuticals, agrochemicals, dyes and pigments, cosmetics, oil chemicals, electronic chemicals, auxiliaries, flavors and fragrances and as components or intermediates of polymers and catalysts. ADVANTAGE - The process allows conversion of readily available organic chemical starting materials to aromatic species of potential use in many organic chemistry-based industries.