苯甲酰丙酮存在下二氯二茂钛与取代水杨酸反应研究

Reaction of titanocene dichloride with substituted salicylic acid in presence of benzoylacetone

在苯甲酰丙酮存在下,采用两相法简便合成了三种取代水杨酸二茂钛配合物.经过表征发现,合成的配合物中均不含苯甲酰丙酮配体,而是形成以取代水杨酸为双齿配体的六元杂环化合物.利用电子吸收光谱对此两相反应的水相和有机相分别进行了动态监测,发现苯甲酰丙酮首先与二氯二茂钛形成水溶性的配合物,然后该水溶性配合物再与有机相中的取代水杨酸作用形成目标配合物,苯甲酰丙酮在整个反应中充当了过渡性配体的角色.

The benzoylacetone is presented: three titanocene complexes are prepared in two-phase medium respectively. The complexes are characterized by elemental analysis, IR and ()~1H NMR spectra. The results show that substituted salicylic acid acts as a bidentate ligand and coordinates with Ti to form a cyclic compound. Based on the UV-vis spectrum, the mechanism of reaction is proposed as follows: first, benzoylacetone and Cp_2TiCl_2 in the aqueous phase form an aqueous-complex——benzoylacetonato titanocene complex. And the aqueous-complex undergoes a ligand exchange with thiosalicylic acid in the organic phase to form the final complex, benzoylacetone only acts as a transitional ligand in the reaction.