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8
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0000189831
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Phenyl is usually able to stabilise a carbanion slightly better than Me3Si. The following examples of pKa's illustrate this (taken from Reich's webpage at http://www.chem.wisc.edu/areas/organic/index- chem.htm, accessed at 25th/April/2007). PhSO2CH 2Ph (23.4), PhSO2CH2SiMe3 (28.7); (EtO)2P(O)CH2Ph (27.6), (EtO)2P(O)CH 2SiMe3 (28.7); FlCHPh (17.9), FlCHSiMe3 (21.5). Fl = fluorenyl Although Ph and TMS have similar A values, this doesn't always result in the same steric influence due to the shape of the Ph group but they are nevertheless a reasonable guide. For a discussion of this issue see:
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D. J. S. Tsai D. Matteson Organometallics 1983 2 236
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(1983)
Organometallics
, vol.2
, pp. 236
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Tsai, D.J.S.1
Matteson, D.2
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24
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33645397527
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Schrödinger, Portland, Oregon
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Jaguar 6.0, LLC, Schrödinger, Portland, Oregon, 2005
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(2005)
Jaguar 6.0, LLC
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25
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0141704726
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Gaussian, Inc., Pittsburgh, PA
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M. J. Frisch, G. W. Trucks, H. B. Schlegel, G. E. Scuseria, M. A. Robb, J. R. Cheeseman, J. A. Montgomery, Jr. T. Vreven, K. N. Kudin, J. C. Burant, J. M. Millam, S. S. Iyengar, J. Tomasi, V. Barone, B. Mennucci, M. Cossi, G. Scalmani, N. Rega, G. A. Petersson, H. Nakatsuji, M. Hada, M. Ehara, K. Toyota, R. Fukuda, J. Hasegawa, M. Ishida, T. Nakajima, Y. Honda, O. Kitao, H. Nakai, M. Klene, X. Li, J. E. Knox, H. P. Hratchian, J. B. Cross, V. Bakken, C. Adamo, J. Jaramillo, R. Gomperts, R. E. Stratmann, O. Yazyev, A. J. Austin, R. Cammi, C. Pomelli, J. Ochterski, P. Y. Ayala, K. Morokuma, G. A. Voth, P. Salvador, J. J. Dannenberg, V. G. Zakrzewski, S. Dapprich, A. D. Daniels, M. C. Strain, O. Farkas, D. K. Malick, A. D. Rabuck, K. Raghavachari, J. B. Foresman, J. V. Ortiz, Q. Cui, A. G. Baboul, S. Clifford, J. Cioslowski, B. B. Stefanov, G. Liu, A. Liashenko, P. Piskorz, I. Komaromi, R. L. Martin, D. J. Fox, T. Keith, M. A. Al-Laham, C. Y. Peng, A. Nanayakkara, M. Challacombe, P. M. W. Gill, B. G. Johnson, W. Chen, M. W. Wong, C. Gonzalez and J. A. Pople, GAUSSIAN 03 (Revision B.04), Gaussian, Inc., Pittsburgh, PA, 2003
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(2003)
GAUSSIAN 03 (Revision B.04)
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Frisch, M.J.1
Trucks, G.W.2
Schlegel, H.B.3
Scuseria, G.E.4
Robb, M.A.5
Cheeseman, J.R.6
Montgomery Jr. J., A.7
Vreven, T.8
Kudin, K.N.9
Burant, J.C.10
Millam, J.M.11
Iyengar, S.S.12
Tomasi, J.13
Barone, V.14
Mennucci, B.15
Cossi, M.16
Scalmani, G.17
Rega, N.18
Petersson, G.A.19
Nakatsuji, H.20
Hada, M.21
Ehara, M.22
Toyota, K.23
Fukuda, R.24
Hasegawa, J.25
Ishida, M.26
Nakajima, T.27
Honda, Y.28
Kitao, O.29
Nakai, H.30
Klene, M.31
Li, X.32
Knox, J.E.33
Hratchian, H.P.34
Cross, J.B.35
Bakken, V.36
Adamo, C.37
Jaramillo, J.38
Gomperts, R.39
Stratmann, R.E.40
Yazyev, O.41
Austin, A.J.42
Cammi, R.43
Pomelli, C.44
Ochterski, J.45
Ayala, P.Y.46
Morokuma, K.47
Voth, G.A.48
Salvador, P.49
Dannenberg, J.J.50
Zakrzewski, V.G.51
Dapprich, S.52
Daniels, A.D.53
Strain, M.C.54
Farkas, O.55
Malick, D.K.56
Rabuck, A.D.57
Raghavachari, K.58
Foresman, J.B.59
Ortiz, J.V.60
Cui, Q.61
Baboul, A.G.62
Clifford, S.63
Cioslowski, J.64
Stefanov, B.B.65
Liu, G.66
Liashenko, A.67
Piskorz, P.68
Komaromi, I.69
Martin, R.L.70
Fox, D.J.71
Keith, T.72
Al-Laham, M.A.73
Peng, C.Y.74
Nanayakkara, A.75
Challacombe, M.76
Gill, P.M.W.77
Johnson, B.G.78
Chen, W.79
Wong, M.W.80
Gonzalez, C.81
Pople, J.A.82
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