Methods pinocembrin and its derivatives were synthesized with 2 , 4 , 6 - trihydroxy - phenylethanone as the starting material via four steps including protection of the hydroxy - group , condensation , cyclization and deprotection 方法以2 , 4 , 6 -三羟基苯乙酮为起始原料,经羟基保护、缩合、环化、脱保护合成目标化合物。
Two kinds of flavonoids in water extracts , water - extraction and alcohol precipitation , alcohol extracts were found by paper chromatography . they were separated and purified by thin - layer chromatography , one of which was primarily identified by uv as 4 " , 5 - dihydroxy - flavonol etherification or 4 " , 5 , 8 - trihydroxy - flavonol etherification 水提物、水提醇沉物、醇提物等3种提取物纸层析结果显示有两种黄酮类化合物,经薄层层析分离纯化,并进行紫外光谱分析,初步测定其中一组分为4 , 5 -二羟基黄酮醇醚或4 , 5 , 8 -三羟基黄酮醇醚。