SAC-13 silica nanocomposite solid acid catalyst in organic synthesis

Recent Progress on Nafion‐Based Nanocomposite Membranes for Fuel Cell Applications

“…It is evident from the literature that Nafion is the leading candidate for PEM fuel cells, though other membranes such as poly(vinylidene fluoride) (PVDF), poly(ether ether ketone) (PEEK), and poly(tetrafluoroethylene) (PTFE) have also been investigated 12. In addition to fuel cell applications, Nafion has been widely used in metal ion recovery as a super acid catalyst in organic reactions and different electrochemical devices 13–17. Typical physical properties of Nafion membranes are illustrated in Table 1.…”

Nafion-Silica Nanocomposites: A New Generation of Water-Tolerant Solid Acids of High Efficiency

“…Nafion SAC-13 was recently demonstrated to be an excellent solid acid in the formation of various protective groups [91]. The processes include the formation of tetrahydropyranyl (THP) ethers of alcohols (Scheme 20, Table 22), the acetalization of carbonyl groups with ethane-1,2-diol and propane-1,3-diol (Scheme 21, Table 23), and the transformation of aldehydes to 1,1-diacetates (Scheme 22, Table 24).…”

Ethylenediamine attached to silica as an efficient, reusable nanocatalyst for the addition of nitromethane to cyclopentenone

“…Because amine is a strong organic base [14], it has been used as catalyst for reactions such as Michael additions, which involve carbon-carbon bond formation [15][16][17]. Therefore, the incorporation of basic organic groups into mesoporous silica has been described as an elegant method for the development of heterogeneous, reusable catalysts for Michael additions [18,19].…”