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20. 1H NMR yield using mesitylene as the internal reference. A 40% isolated yield
was obtained, as the product partly decomposed during the silica gel
chromatographic purification.
21. The supplementary crystallographic data for this Letter have been deposited at
the CCDC. The numbers are: for 6, CCDC 878009; for 11, CCDC 878010; for 20,
CCDC 878011. These data can be obtained free of charge from The Cambridge
also the Supplementary data.