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Rational Design of a Polyoxometalate Intercalated Layered Double Hydroxide: Highly Efficient Catalytic Epoxidation of Allylic Alcohols under Mild and Solvent‐Free Conditions
Author(s) -
Li Tengfei,
Wang Zelin,
Chen Wei,
Miras Haralampos N.,
Song YuFei
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201604180
Subject(s) - allylic rearrangement , polyoxometalate , catalysis , hydroxide , solvent , chemistry , rational design , layered double hydroxides , organic chemistry , polymer chemistry , materials science , nanotechnology
Intercalation catalysts, owing to their modular and accessible gallery and unique interlamellar chemical environment, have shown wide application in various catalytic reactions. However, the poor mass transfer between the active components of the intercalated catalysts and organic substrates is one of the challenges that limit their further application. Herein, we have developed a novel heterogeneous catalyst by intercalating the polyoxometalate (POM) of Na 9 LaW 10 O 36 ⋅32 H 2 O (LaW 10 ) into layered double hydroxides (LDHs), which have been covalently modified with ionic liquids (ILs). The intercalation catalyst demonstrates high activity and selectivity for the epoxidation of various allylic alcohols in the presence of H 2 O 2 . For example, trans ‐2‐hexen‐1‐ol undergoes up to 96 % conversion and 99 % epoxide selectivity at 25 °C in 2.5 h. To the best of our knowledge, the Mg 3 Al−ILs−C 8 −LaW 10 composite material constitutes one of the most efficient heterogeneous catalysts for the epoxidation of allylic alcohols (including the hydrophobic allylic alcohols with long alkyl chains) reported so far.