| 摘要 |
The process for the production of the carboxylic acid chlorides of the aromatic nitrogen heterocycles of the series of the compounds of the general formulas: <IMAGE> I <IMAGE> II <IMAGE> III The hydroxy carboxylic acids of the aromatic nitrogen heterocycles from the series of the compounds of the general formulas: <IMAGE> IV <IMAGE> V <IMAGE> VI In the general formulas I to VI, R1, R2, R3, R4, R5, R6, R7 and R8 are the same or different and each is a hydrogen atom or a halogen atom. The chlorination is performed with a solution of phosphorous pentachloride in phosphoroxy chloride. The excess phosphorous pentachloride is converted into phosphoroxy chloride either with a C1-C4-carboxylic acid or with a silane of the general formula: (CH3)3-Si-OR9 VII Then the product according to one of the general formulas I to III is isolated.
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