10.1002/ejoc.201901753
European Journal of Organic Chemistry
COMMUNICATION
the organic phase was extracted with ethyl acetate (3 × 10 mL),
dried over anhydrous Mg2SO4, filtered and the solvent was
removed in vacuo. The residue was purified by column
chromatography to give pure product 2.
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Crystallographic Data. CCDC 1938027 (for 2f),
1938029 (for 2i), 1938020 (for 2j), 1938028 (for 2q), and
1938024 (for 7) contain the supplementary crystallographic data
for this paper. These data can be obtained free of charge from
The Cambridge Crystallographic Data Centre.
Acknowledgments
We thank the National Natural Science Foundation of China
(Nos. 21672193, 21272218), Ministry of industry and information
technology (Z135060009002), and postdoctoral research grant
in Henan Province (001803004) and Zhengzhou University of
China for financial support of this research.
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Keywords: six-membered phosphacycle • Ag-catalysis •
diarylphosphine oxide • phosphorus radical • intramolecular
cyclization
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