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Received: 14 September 2017; Accepted: 2 May 2018;
Published: xx xx xxxx
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acknowledgements
We thank Z. K. Wickens (Harvard University) for a critical proofreading of this
manuscript. Generous funding from the Max-Planck-Society, the Max-Planck-Institut
für Kohlenforschung and LG Chem (fellowship to Y.H.L.) is acknowledged. We thank
B. List for sharing analytical equipment, and our NMR spectroscopy, mass spectrometry
and X-ray departments for technical assistance.
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author contributions
Y.H.L. and B.M. conceived the project and prepared the manuscript. B.M. directed
the work. Y.H.L. developed and studied the reaction experimentally. Both the authors
analysed the data.
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Competing interests
The authors declare no competing interests.
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