Organometallics
Article
yellow precipitate was collected by vacuum filtration, washed with two
portions of cold MeOH (5 mL), and dried under high vacuum to yield
12 (1.92 g, 84%) as a fine, bright yellow powder. Mp: 190−192 °C
dec. Anal. Calcd for C33H31ClNiP2: C, 67.90; H, 5.35. Found: C,
Pd2(dba)3 as a result of the reagents required for their synthesis, yield
of the reaction, and cost of purification.
(3) Stephenson, T. A.; Morehouse, S. M.; Powell, A. R.; Heffer, J. P.;
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(4) For reviews of palladacycles in synthesis from 2001 and earlier,
1
68.28; H, 5.66. H NMR (500 MHz, CD2Cl2, δ): 8.16 (dd, J = 10.9,
7.3 Hz, 4H), 7.77 (ddd, J = 9.2, 7.1, 1.8 Hz, 2H), 7.62−7.41 (m, 9H),
7.31 (t, J = 7.1 Hz, 1H), 7.20 (dt, J = 8.4, 4.7 Hz, 1H), 7.07 (td, J = 7.7,
2.6 Hz, 2H), 6.71 (dd, J = 10.8, 7.6 Hz, 2H), 6.59 (dd, J = 6.0, 2.9 Hz,
2H), 6.45−6.39 (m, 1H), 2.58−2.34 (m, 2H), 2.34−2.09 (m, 4H),
1.60 (tdd, J = 14.4, 11.7, 6.7 Hz, 1H). 31P{1H} NMR (121 MHz,
CD2Cl2, δ): 53.09 (d, J = 17.9 Hz), 35.78 (d, J = 17.8 Hz). 13C{1H}
NMR (126 MHz, CD2Cl2, δ): 158.03 (dd, J = 86.1, 38.5 Hz), 143.71
(t, J = 2.0 Hz), 136.17 (dd, J = 3.1, 1.7 Hz), 134.97 (d, J = 11.2 Hz),
134.08 (d, J = 11.2 Hz), 133.14 (d, J = 10.3 Hz), 132.20 (d, J = 8.4
Hz), 131.92 (d, J = 2.6 Hz), 131.66 (d, J = 1.5 Hz), 131.28 (d, J = 2.1
Hz), 130.87 (dd, J = 47.8, 0.6 Hz), 130.73 (d, J = 2.3 Hz), 130.39 (dd,
J = 31.9, 0.8 Hz), 130.35 (d, J = 2.7 Hz), 129.72 (dd, J = 56.0, 5.0 Hz),
129.38 (d, J = 9.2 Hz), 129.28 (d, J = 10.5 Hz), 129.02 (dd, J = 6.3, 2.4
Hz), 128.94 (d, J = 9.4 Hz), 127.94 (d, J = 10.1 Hz), 123.49 (dd, J =
6.3, 1.7 Hz), 122.71 (t, J = 1.2 Hz), 29.34 (dd, J = 27.7, 21.7 Hz),
25.50 (q, J = 1.7 Hz), 22.22 (dd, J = 26.0, 11.4 Hz). IR (ATR, cm−1):
3051 (w), 1561 (w), 1434 (m), 1421 (w), 1098 (m), 1026 (m), 1012
(w), 999 (w), 873 (w), 817 (m), 749 m), 742 (s), 708 (m), 692 (s),
679 (m), 652 (m).
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ASSOCIATED CONTENT
* Supporting Information
(8) An excellent overview of these precatalysts is provided in:
(a) Hill, L. L.; Crowell, J. L.; Tutwiler, S. L.; Massie, N. L.; Hines, C.
C.; Griffin, S. T.; Rogers, R. D.; Shaughnessy, K. H.; Grasa, G. A.;
Johansson Seechurn, C. C. C.; Li, H.; Colacot, T. J.; Chou, J.;
Woltermann, C. J. J. Org. Chem. 2010, 75, 6477−6488. (b) Johansson
Seechurn, C. C. C.; Parisel, S. L.; Colacot, T. J. J. Org. Chem. 2011, 76,
7918−7932.
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S
Text, figures, tables, and CIF files giving experimental
procedures and spectral data for complexes 1−19, X-ray
crystallographic data for complexes 6, 9, 15, 17, 18, 19, a
description of single-crystal X-ray diffraction experiments, and
full reaction screening information and procedures. This
material is available free of charge via the Internet at http://
(9) (a) For the first instance of zinc reduction of (PPh3)2NiCl2 to
access Ni(0), see: Kende, A. S.; Liebeskind, L. S.; Braitsch, D. M.
Tetrahedron Lett. 1975, 39, 3375−3378. (b) For an overview of the
development of nickel precatalysts, see: Rosen, B. M.; Quasdorf, K.
W.; Wilson, D. A.; Zhang, N.; Resmerita, A.-M.; Garg, N. K.; Percec,
V. Chem. Rev. 2011, 111, 1346−1416.
(10) For an example of the use of a Grignard reagent to preactivate a
Ni(II) catalyst, see: Wolfe, J. P.; Buchwald, S. L. J. Am. Chem. Soc.
1997, 119, 6054−6058.
(11) (a) Chatt, J.; Shaw, B. L. J. Chem. Soc. 1960, 1718−1729.
(b) Cross, R. J.; Wardle, R. J. Chem. Soc. A 1970, 840−845.
(12) For a selection of some recent examples, see: (a) Chen, C.;
Yang, L.-M. Tetrahedron Lett. 2007, 48, 2427−2430. (b) Gao, C.-Y.;
Yang, L.-M. J. Org. Chem. 2008, 73, 1624−1627. (c) Zhou, L.; Feng,
X.; He, R.; Bao, M. J. Coord. Chem. 2009, 62, 2824−2831. (d) Fan, X.-
H.; Yang, L.-M. Eur. J. Org. Chem. 2010, 2457−2460. (e) Fan, X.-H.;
Yang, L.-M. Eur. J. Org. Chem. 2011, 1467−1471. (f) Zhang, N.;
Hoffman, D. J.; Gutsche, N.; Gupta, J.; Percec, V. J. Org. Chem. 2012,
77, 5956−5964. (g) Leowanawat, P.; Zhang, N.; Safi, M.; Hoffman, D.
J.; Fryberger, M. C.; George, A.; Percec, V. J. Org. Chem. 2012, 77,
2885−2892. (h) Park, N. H.; Teverovskiy, G.; Buchwald, S. L. Org.
Lett. 2014, 16, 220−223.
AUTHOR INFORMATION
Corresponding Author
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Present Address
†Department of Chemistry and Biochemistry, Brigham Young
University, Provo, UT 84602.
Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
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Dr. Georgiy Teverovskiy and Prof. Stephen Buchwald are
acknowledged for insightful discussion and advice. Financial
support has been provided by the NIGMS (GM63755) and by
an NSF Graduate Research Fellowship (E.A.S.). X-ray
crystallography was carried out on instrumentation purchased
with the help of NSF grant CHE-0946721. NMR spectroscopy
was carried out on instruments purchased in part with funds
provided by the NSF (CHE-9808061 and CHE-8915028).
(13) For the use of these precatalysts for cross-coupling polymer-
ization, see: (a) Miyakoshi, R.; Yokoyama, A.; Yokozawa, T. J. Am.
Chem. Soc. 2005, 127, 17542−17547. (b) Bronstein, H. A.; Luscombe,
C. K. J. Am. Chem. Soc. 2009, 131, 12894−12895.
REFERENCES
(14) McNeil and co-workers have carried out detailed studies into
use of this type of precatalyst for the synthesis of poly(thiophene) and
related polymers: (a) Lanni, E. L.; McNeil, A. J. J. Am. Chem. Soc.
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molecules 2010, 43, 8039−8044. (c) Lanni, E. L.; Locke, J. R.; Gleave,
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Chem. Sci. 2013, 4, 1620−1624. (g) Bryan, Z. J.; McNeil, A. J.
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(2) Palladium metal is more than 1500 times more expensive than
nickel metal, yet the cost of Ni(cod)2 is only ca. 50% less than
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dx.doi.org/10.1021/om500156q | Organometallics 2014, 33, 2012−2018