Novel Stilbene-triazine Symmetrical Optical Brighteners: Synthesis and Applications
作者:Aamer Saeed、Ghulam Shabir、Iram Batool
DOI:10.1007/s10895-014-1392-1
日期:2014.7
A series of new high light fastness, hot pressing fastness optical brighteners was efficiently synthesized by a three-step approach involving the successive replacement of the three chloro groups of 2,4,6-trichloro-1,3,5-triazine under different conditions of temperature and pH. Thus, 2,4,6-trichloro-1,3,5-triazine was treated with different anilines and the resulting dichlorotriazinyl intermediates (3a-I) were further condensed with 4,4-diaminostilbene-2,2′-disulfonic acid to afford bis-monochlorotriazine (5a-I) followed by nucleophilic substitution with ethanolamine to furnish the final hybrid brighteners (7a-I). All of the newly synthesized compounds were characterized by Fourier-Transform Infrared (FT-IR), UV-visible absorption, NMR spectroscopy and the elemental analyses. The synthesized optical brighteners were also assessed for their efficacy as fluorescent brightening agents.
在不同的温度和 pH 值条件下,通过三步法连续取代 2,4,6-三氯-1,3,5-三嗪的三个氯基,高效合成了一系列新型高耐光性、热压牢度光学增白剂。因此,2,4,6-三氯-1,3,5-三嗪先用不同的苯胺处理,得到的二氯三嗪中间体(3a-I)再与 4,4-二氨基二苯乙烯-2,2′-二磺酸缩合,得到双一氯三嗪(5a-I),然后用乙醇胺进行亲核取代,得到最终的混合增白剂(7a-I)。所有新合成的化合物都通过傅立叶变换红外光谱(FT-IR)、紫外-可见吸收光谱、核磁共振光谱和元素分析进行了表征。还评估了合成的光学增白剂作为荧光增白剂的功效。