DOI: 10.1039/C4RA11865K
RSC Advances
ARTICLE
Journal Name
deacetalization-Knoevenagel cascade reaction. Compared with
previous reports, the crystalline frameworks of HSZs offer
strong acid sites and high stability, meanwhile the mesoporous
structure introduced in HSZs is in favor of the fast diffusion of
reagents and products. As a result, the optimized HSZs-
NH2(0.2) keeps 100% conversion of benzaldehyde dimethyl
acetal and 96% yield of the target product ethyl trans-α-
cyanocinnamate over six cycles. Furthermore, it is suggested
that, depending on the modification amount of aminosilanes,
there exists two kinds of amine species at least in the resultant
HSZs-NH2 catalysts, one (free amine) possesses base catalytic
activity and the other (the restricted one) is almost catalytically
inactive. We expect that this bi-functional catalyst based on the
hierarchically structured zeolites may open up a new thought
for the development of the multi-functionalized HSZs as an
environment friendly and highly efficient nanoreactor as well as
the natural enzymes.
9
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Acknowledgements
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7944.
This work was sponsored by National Key Basic Research
Program of China (2013CB933200), National 863 plans
projects (2012AA062703), Key Program for Science and
Technology
Commission
of
Shanghai
Municipality
(11JC1413400), the Opening Project of State Key Laboratory
of Heavy Oil Processing (2014).
Notes and references
State Key Laboratory of High Performance Ceramics and
Superfine Microstructure Department, Shanghai Institute of
Ceramics, Chinese Academy of Sciences. Ding-xi Road 1295,
Shanghai 200050 (P.R. China). E-mail: huazl@mail.sic.ac.cn;
jlshi@mail.sic.ac.cn. Fax: (+86-21-52413233).
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