[7] a) S. J. Geier, P. A. Chase, D. W. Stephan, Metal-free reductions of N-heterocycles via Lewis
acid catalyzed hydrogenation, Chem. Commun. 46 (2010) 4884–4886. b) L. Greb, P. Oña-
Burgos, B. Schirmer, S. Grimme, D. W. Stephan, J. Paradies, Metal-free Catalytic Olefin
Hydrogenation: Low-Temperature H2 Activation by Frustrated Lewis Pairs, Angew. Chem. Int.
Ed. 51 (2012) 10164–10168; Angew. Chem. 124 (2012) 10311–10315. c) Y. Segawa, D. W.
Stephan, Metal-free hydrogenation catalysis of polycyclic aromatic hydrocarbons, Chem.
Commun. 48 (2012) 11963–11965. d) K. Chernichenko, Á. Madarász, I. Pápai, M. Nieger, M.
Leskelä, T. A. Repo, A frustrated-Lewis-pair approach to catalytic reduction of alkynes to cis-
alkenes, Nat. Chem. 5 (2013) 718–723. e) L. J. Hounjet, C. Bannwarth, C. N. Garon, C. B.
Caputo, S. Grimme, D. W. Stephan, Combinations of Ethers and B(C6F5)3 Function as
Hydrogenation Catalysts, Angew. Chem., Int. Ed., 52 (2013) 7492-7495. f) T. Mahdi, D. W.
Stephan, Enabling Catalytic Ketone Hydrogenation by Frustrated Lewis Pairs, J. Am. Chem.
Soc. 136 (2014) 15809–15812. g) D. J. Scott, M. J. Fuchter, A. E. Ashley, Nonmetal Catalyzed
Hydrogenation of Carbonyl Compounds, J. Am. Chem. Soc. 136 (2014) 15813–15816
[8] a) G. Erős, H. Mehdi, I. Pápai, T. A. Rokob, P. Király, G. Tárkányi, T. Soós, Expanding the
Scope of Metal-Free Catalytic Hydrogenation through Frustrated Lewis Pair Design, Angew.
Chem. Int. Ed. 49 (2010) 6559–6563; Angew. Chem. 122 (2010) 6709–6713. b) G. Erős, K.
Nagy, H. Mehdi, I. Pápai, P. Nagy, P. Király, G. Tárkányi, T. Soós, Catalytic Hydrogenation
with Frustrated Lewis Pairs: Selectivity Achieved by Size-Exclusion Design of Lewis Acids,
Chem. Eur. J. 18 (2012) 574–585. c) É. Dorkó, B. Kótai, T. Földes, Á. Gyömöre, I. Pápai, T.
Soós, Correlating electronic and catalytic properties of frustrated Lewis pairs for imine
hydrogenation, J. Organomet. Chem. 847 (2017) 258–262.
[9] a) B.-H. Xu, G. Kehr, R. Fröhlich, B. Wibbeling, B. Schirmer, S. Grimme, G. Erker,
Reaction of Frustrated Lewis Pairs with Conjugated Ynones-Selective Hydrogenation of the
Carbon-Carbon Triple Bond, Angew. Chem. Int. Ed. 50 (2011) 7183–7186; Angew. Chem. 123
(2011) 7321–7324. b) J. S. Reddy, B.-H. Xu, T. Mahdi, R. Fröhlich, G. Kehr, D. W. Stephan, G.
Erker, Alkenylborane-Derived Frustrated Lewis Pairs: Metal-Free Catalytic Hydrogenation
Reactions of Electron-Deficient Alkenes, Organometallics 31 (2012) 5638–5649. See also: c) B.
Ines, D. Palomas, S. Holle, S. Steinberg, J. A. Nicasio, M. Alcarazo, Metal-free Hydrogenation
of Electron-Poor Allenes and Alkenes, Angew. Chem. Int. Ed. 51 (2012) 12367-12369. d)
Review: J. Lam, K. M. Szkop, E. Mosaferi, D. W. Stephan, FLP catalysis: main group
hydrogenations of unsaturated substrates, Chem. Soc. Rev. 48 (2019) 3592-3612.
[10] a) D. J. Parks, R. E. von H. Spence, W. E. Piers, Bis(pentafluorophenyl)borane: Synthesis,
Properties, and Hydroboration Chemistry of a Highly Electrophilic Borane Reagent, Angew.
Chem. Int. Ed. Engl. 34 (1995) 809–811; Angew. Chem. 107 (1995) 895–897. b) D. J. Parks, W.
E. Piers, G. P. A. Yap, Synthesis, Properties, and Hydroboration Activity of the Highly
Electrophilic Borane Bis(pentafluorophenyl)borane, Organometallics 17 (1998) 5492–5503.
[11] a) M. Sajid, L.-M. Elmer, C. Rosorius, C. G. Daniliuc, S. Grimme, G. Kehr, G. Erker, Facile
Carbon Monoxide Reduction at Intramolecular Frustrated Phosphane/Borane Lewis Pair
Templates, Angew. Chem. Int. Ed. 52 (2013) 2243–2246; Angew. Chem. 125 (2013) 2299–
2302. b) M. Sajid, A. Klose, B. Birkmann, L. Liang, B. Schirmer, T. Wiegand, H. Eckert, A. J.
Lough, R. Fröhlich, C. G. Daniliuc, S. Grimme, D. W. Stephan, G. Kehr, G. Erker, Reactions of
phosphorus/boron frustrated Lewis pairs with SO2, Chem. Sci. 4 (2013) 213–219. c) M. Sajid, A.
Lawzer, W. Dong, C. Rosorius, W. Sander, B. Schirmer, S. Grimme, C. G. Daniliuc, G. Kehr, G.
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