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Scheme 4. The plausible mechanism for the Wadsworth–Emmons reaction
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t
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The higher activity and turnover number displayed by the
cat. B is ascribed to the smaller crystallites and high surface
area. All these results demonstrate that the WE reactions
could be conducted with high atom utilization using solid
base catalysts rather than soluble bases, which require near-
stoichiometric quantities.
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Acknowledgments
This work was realized in the frame of an Indo-French
co-operative program, funded by IFCPAR (Project No.
IFC/1106-2/96/2460). Ch.V.R. and B.B. thank the Council
of Scientific and Industrial Research (CSIR), India, for the
award of Senior Research Fellowship. We also thank Dr. B.
Jagadeesh (Center for NMR spectroscopy, IICT) for record-
ing 27Al MAS NMR spectra.
(k) B.M. Choudary, N.S. Chowdari, K. Jyothi, M. Lakshmi Kantam,
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