Chemical Science
Edge Article
connected to such via a low-barrier pathway. Although the full 21 B. Ghaffari, S. M. Preshlock, D. L. Plattner, R. J. Staples,
mechanistic picture remains uncertain, the presently reported
results strongly suggest that a pincer ligand containing an
P. E. Maligres, S. W. Krska, R. E. Maleczka Jr and
M. R. Smith III, J. Am. Chem. Soc., 2014, 136, 14345.
amido donor is key to an active DHBTA catalyst with iridium. An 22 S. M. Preshlock, B. Ghaffari, P. E. Maligres, S. W. Krska,
intriguing possibility is that this is related to the facile migra-
tion of boryl from the metal to the amido nitrogen we recently
discovered for 1-Ir-Bpin2 and 1-Rh-Bpin2.80
R. E. Maleczka Jr and M. R. Smith III, J. Am. Chem. Soc.,
2013, 135, 7572.
23 D. Ogawa, J. Li, M. Suetsugu, J. Jiao, M. Iwasaki and
Y. Nishihara, Tetrahedron Lett., 2013, 54, 518.
24 V. Gandon, D. Leca, T. Aechtner, K. P. C. Vollhardt,
M. Malacria and C. Aubert, Org. Lett., 2004, 6, 3405.
25 J. Huang, S. J. F. Macdonald and J. P. A. Harrity, Chem.
Commun., 2009, 436.
Acknowledgements
We are grateful for the support of this research by the US
´
´
National Science Foundation (grant CHE-1310007 to O. V. O.), 26 J. Barluenga, P. Barrio, L. Riesgo, L. A. Lopez and M. Tomas,
the Welch Foundation (grant A-1717 to O. V. O.), and Funda- J. Am. Chem. Soc., 2007, 129, 14422.
mental Research Funds for the Central Universities of China 27 L. Deloux, E. Skrzypczak-Jankun, B. V. Cheesman,
(Grant No. AUGA5710013115 to J. Z.). We are also grateful to Ms.
Linda Redd for editorial assistance.
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