Catalyst for regioselective nuclear chlorination of aromatic hydrocarbons and method for nuclear chlorination

摘要

A novel 10 - substituted 10h phenothiazines used as catalysts for regioselective chlorination of aromatic hydrocarbons in combination with Ruiz acid. The 10h phenothiazine-10-carboxylic acid phenyl ester represented by the following formula (I) can be used as a catalyst for regioselective nucleation of aromatic hydrocarbons in combination with Ruiz acid. This catalyst has the advantage that the position selectivity is not lowered even if nuclear chlorination is carried out at a reaction temperature exceeding 45.degree. C., and the position selectivity is improved as the degree of chlorination increases.In formula (x), X represents a halogen atom, 1 to 4 alkyl groups, 1 to 4 carbon atoms, 1 to 4 carbon atoms, a nitro group or a cyano group, n represents an integer of 0 to 5, and X may be the same or different in magnitude when n is greater than T represents an integer of 0 to 4, and u represents an integer of 0 to 4, but (n + s) is 5 or less. )