tris(hydrogensulfato) boron B(HSO4)3 as the outer shell. This effective and magnetically recoverable catalyst was employed for the synthesis of α,ά-benzylidene bis(4-hydroxycoumarin) derivatives through the reaction of an aromatic aldehyde and 4-hydroxycoumarin under solvent-free conditions. This acid catalyst was characterized by Fourier transform infrared spectroscopy, X-ray diffraction analysis, scanning
纳米铁氧体负载的三(氢
硫酸根)
硼[Fe 3 O 4 @B(HSO 4)3 ]是通过捕获Fe 3 O 4磁性纳米粒子为芯和三(氢
硫酸根)
硼B(HSO 4)3制备的。作为外壳。通过在无溶剂条件下芳族醛与
4-羟基
香豆素的反应,将该有效且可磁回收的催化剂用于合成α,β-亚苄基双(
4-羟基
香豆素)衍
生物。该酸催化剂的特征在于傅立叶变换红外光谱,X射线衍射分析,扫描电子显微镜,透射电子显微镜,热重分析和差示扫描量热法,能量色散X射线光谱,Brunauer–Emmett–Teller分析,Barret– Joyner–Halenda分析,振动样品磁力计和滴定。