Communication
ChemComm
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11 (a) S. T. Liddle, I. S. Edworthy and P. L. Arnold, Chem. Soc. Rev., 18 For selected examples: (a) P. A. Chase, T. Jurca and D. W. Stephan, Chem.
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12 (a) Z. R. Turner, R. Bellabarba, R. P. Tooze and P. L. Arnold, J. Am. Chem.
Commun., 2008, 1701–1703; (b) T. Mahdi, Z. M. Heiden, S. Grimme and
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H. Du, J. Am. Chem. Soc., 2013, 135, 6810–6813.
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and R. P. Tooze, J. Am. Chem. Soc., 2011, 133, 11744–11756; (c) P. L.
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Trans., 2014, 43, 34–37; (d) P. L. Arnold, R. W. F. Kerr, C. Weetman, 20 Both of RE aryloxide or NHC alone can react with CO2, see:
S. R. Docherty, J. Rieb, F. L. Cruickshank, K. Wang, C. Jandl,
(a) L. A. M. Steele, T. J. Boyle, R. A. Kemp and C. Moore, Polyhedron,
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M. W. McMullon, A. Pothig, F. E. Ku¨hn and A. D. Smith, Chem. Sci.,
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13 We conducted the reaction of NHC 2a with sterically less encum- 21 For selected examples: (a) C. M. Momming, E. Otten, G. Kehr,
bered La(OAr)3 (Ar = 2,6-iPr2-C6H3) at room temperature. However, it
seemed to be complicated, giving an NHC self-dehydrogenation
compound and other unidentified complexes, rather than a simple
NHC coordination.
R. Frohlich, S. Grimme, D. W. Stephan and G. Erker, Angew. Chem.,
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Chem. Soc., 2010, 132, 13559–13568; (c) C. Appelt, H. Westenberg,
F. Bertini, A. W. Ehlers, J. C. Slootweg, K. Lammertsma and W. Uhl,
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¨
14 We also treated La complex 1a with 1,3-bis-(t-butyl)imidazol-2-
ylidene (ItBu), which has an unsaturated carbene backbone, at room
temperature. It showed different result to those of saturated ones
and possibly gave an abnormal type NHC-La adduct. The details of 22 For selected examples: (a) A. M. Chapman, M. F. Haddow and
the reaction are under investigation.
15 G. D. Frey, V. Lavallo, B. Donnadieu, W. W. Schoeller and G. Bertrand,
Science, 2007, 316, 439–441.
16 (a) D. Holschumacher, T. Bannenberg, C. G. Hrib, P. G. Jones and
M. Tamm, Angew. Chem., Int. Ed., 2008, 47, 7428–7432; (b) P. A. Chase
and D. W. Stephan, Angew. Chem., Int. Ed., 2008, 47, 7433–7437;
D. F. Wass, J. Am. Chem. Soc., 2011, 133, 18463–18478; (b) M. J. Sgro
and D. W. Stephan, Angew. Chem., Int. Ed., 2012, 51, 11343–11345;
(c) M. J. Sgro and D. W. Stephan, Chem. Commun., 2013, 49, 2610–2612;
(d) X. Xu, G. Kehr, C. G. Daniliuc and G. Erker, Angew. Chem., Int. Ed.,
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I. Manners and D. F. Wass, J. Am. Chem. Soc., 2016, 138, 1994–2003.
(c) M. Xu, A. R. Jupp, Z. W. Qu and D. W. Stephan, Angew. Chem., 23 T. Simler, T. J. Feuerstein, R. Yadav, M. T. Gamer and P. W. Roesky,
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17 (a) J. W. Runyon, O. Steinhof, H. V. R. Dias, J. C. Calabrese, W. J. 24 See for a comparison: P. L. Arnold, T. Cadenbach, I. H. Marr,
Marshall and A. J. Arduengo, Aust. J. Chem., 2011, 64, 1165–1172;
(b) G. Schnee, O. N. Faza, D. Specklin, B. Jacques, L. Karmazin,
A. A. Fyfe, N. L. Bell, R. Bellabarba, R. P. Tooze and J. B. Love,
Dalton Trans., 2014, 43, 14346–14358.
12780 | Chem. Commun., 2019, 55, 12777--12780
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