颜料绿8及其衍生物催化直接羟基化反应制备酚类化合物

Phenolic Compounds Prepared by Direct Hydroxylation of Pigment Green 8 and its Derivatives

根据有机颜料绿8的基本化学结构及合成路线,制备了1-亚硝基-2-萘酚盐的铁配合物,络合物骨架结构是颜料绿8,并将其作为催化剂热催化直接羟基化芳香族化合物制备芳香酚。通过控制苯羟基化的反应温度、反应时间、反应物物质的量之比等条件,由苯直接催化羟基化制备苯酚的选择性达到99.5%。试验发现羟基化的活性中间体为羟基自由基。该催化剂有一定的普适性。根据配体的特殊性质合成了多铁核非均相催化剂,便于催化剂的回收。颜料绿8也可以作为光催化剂用于苯酚羟基化制备邻苯二酚和对苯二酚。本研究对于拓宽有机颜料的新用途、新功能具有很好的借鉴意义。

On the basis of the basic chemical structure and synthetice route of the pigment green 8,the iron complex of 1-nitroso-2-naphthol salt was obtained,performed as the catalyst,the aromatie phenol was synthesized through the direct hydroxylation.The selectivity of preparing the phenol by direct hydroxylation of the benzene could reach 99.5%through optimizing the reaction temperature,time and molar ratio of reactants.The experimental results showed that the hydroxyl radical was the active intermediate of the hydroxylation reaction and the catalyst was universal.According to the special properties of the ligand,the multiferrocore heterogeneous catalyst was synthesized in order to recover the catalyst.Moreover,the pigment green 8 could also be used as the photocatalyst to prepare the pyrocatechol and hydroquinone by the method of hydroxylation of phenol.This research is of great significance for broadening the new uses and functions of the organic pigments.