Tanemura, Kiyoshi published the artcileSilica gel-mediated catalyst-free and solvent-free Michael addition of 1,3-dicarbonyl compounds to highly toxic methyl vinyl ketone without volatilization, COA of Formula: C6H8O3, the publication is Tetrahedron Letters (2020), 61(30), 152142, database is CAplus.
Silica gel-mediated Michael addition of 1,3-dicarbonyl compounds to Me vinyl ketone (MVK) and Et vinyl ketone (EVK) was carried out to give the corresponding adducts in quite excellent yields. The reactions could be carried out without any catalysts and solvents. In addition, highly toxic MVK and EVK could be employed without significant volatilization. Silica gel could be recycled five times without the decrease of the yields.
Tetrahedron Letters published new progress about 517-23-7. 517-23-7 belongs to esters-buliding-blocks, auxiliary class Tetrahydrofuran,Ketone,Ester, name is 3-Acetyldihydrofuran-2(3H)-one, and the molecular formula is C9H9NO, COA of Formula: C6H8O3.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics