for six times without decreasing activity. This nanocatalyst was used successfully for the synthesis of 3,3,10,10-tetramethyl-13-aryl(alkyl)-2,4,9,11-tetraoxadispiro[5.0.57.16]tridecane-1,5,8,12-tetraones (dispiro-cyclopropane’s based on Meldrum’s acid) by the reaction of various aldehydes and Meldrum’s acid in the presence of triethylamine and cyanogen bromide in excellent yield. Graphic abstract
摘要形成了磁性Fe 3 O 4 / P
EG @ C
PTMS-
硫氨基苯酚@Ni纳米催化剂,该纳米催化剂为非均相,稳定且可重复使用的纳米催化剂。该纳米催化剂通过FT-IR,XRD,TGA,ICP,
SEM,EDS和VSM技术表征,在不降低活性的情况下使用了六次。该纳米催化剂已成功用于合成3,3,10,10-四甲基-13-芳基(烷基)-2,4,9,11-四恶二螺[5.0.5 7 .1 6 ]
十三烷-1,5 ,在
三乙胺和
溴化氰存在下,各种醛与麦德鲁姆酸反应生成的8,12-四酮(基于麦德鲁姆酸的双螺
环丙烷)。 图形摘要