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6965615 
Journal Article 
New, stable and reusable magnetic Fe3O4/PEG@CPTMS-thioaminophenol@Ni nanocatalyst for the synthesis of dispiro-cyclopropanes's Meldrum's acid 
Pesyan, NN; Bibak, S; Aalinejad, M; , 
2020 
Yes 
Journal of the Iranian Chemical Society
ISSN: 1735-207X
EISSN: 1735-2428 
SPRINGER 
NEW YORK 
411-422 
WOS:000513235100013 
Magnetic Fe3O4/PEG@CPTMS-thioaminophenol@Ni nanocatalyst as a heterogeneous, stable and reusable nanocatalyst was formed. This nanocatalyst was characterized by FT-IR, XRD, TGA, ICP, SEM, EDS and VSM techniques and was used 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[5.0.5(7).1(6)]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