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LETTER
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Scheme 5 Plausible mechanism.
Supporting Information for this article is available online at
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Acknowledgment
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We thank the DST (New Delhi) and the CSIR (New Delhi) for fi-
nancial assistance. We thank Prof. A. T. Khan, Indian Institute of
Technology, Guwahati, for the XRD data of 7a. One of us (S. M.)
is thankful to DST (New Delhi) and (N.D.) is grateful to UGC (New
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Synlett 2008, No. 18, 2851–2855 © Thieme Stuttgart · New York