Organic Letters
Letter
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mechanically interlocked bisphosphoric acids in organocatal-
ysis,24 we also believe that the novel covalently linked
phosphoric acids are of high interest as chiral Brønsted acids
for homogeneous catalysis.
ASSOCIATED CONTENT
* Supporting Information
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S
The Supporting Information is available free of charge on the
Synthetic procedures, analytical data for all compounds,
and details of DOSY-measurements, NMR titrations, and
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AUTHOR INFORMATION
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Corresponding Author
ORCID
(13) (a) Douteau-Guevel, N.; Perret, F.; Coleman, A. W.; Morel, J.-P.;
Morel-Desrosiers, N. J. Chem. Soc., Perkin Trans. 2002, 2, 524. (b) Liu,
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I. RSC Adv. 2016, 6, 86269. (g) Pettiwala, A. M.; Singh, P. K. ACS
Omega 2017, 2, 8779.
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Am. Chem. Soc. 2007, 129, 1518. (b) Xiong, J.-B.; Xie, W.-Z.; Sun, J.-P.;
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Author Contributions
§F.O.-S. and M.T. contributed equally.
Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
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We gratefully acknowledge financial support by the Fonds der
Chemischen Industrie (Liebig-Fellowship to J.N., doctoral
fellowship to F.O.-S.), by the University of Duisburg-Essen,
and by the Boehringer Ingelheim Foundation. J.N. thanks Prof.
Carsten Schmuck (Department of Chemistry, University of
Duisburg-Essen) for his support. A.P. and G.H.C. thank the
Deutsche Forschungsgemeinschaft (GRK 2376) for support.
̈
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