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5
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0001269629
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Struktur und Reaktivität von Lithiumenolaten, vom Pinakolon zur selektivenC-Alkylierung von Peptiden – Schwierigkeiten und Möglichkeiten durch komplexe Strukturen
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Reviews: (a)
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(1988)
Angewandte Chemie
, vol.100
, pp. 1685-1715
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Seebach, D.1
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15
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84989501770
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2, for which calculations of the complex stability and the intramolecular proton abstraction were carried out, is only a model.
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16
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0010094715
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Röntgenstrukturanalyse von α-Lithiophenylacetonitril · Lithiumdiisopropylamid · 2 Tetramethyl-ethylendiamin – ein „Quasi-Dianion-Komplex”
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α‐Lithiophenylacetonitrile. lithium diisopropylamide · 2 tetramethylethylenediamine
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(1989)
Angewandte Chemie
, vol.101
, pp. 1424-1425
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Zarges, W.1
Marsch, M.2
Harms, K.3
Boche, G.4
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20
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84987564680
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Intramolecular acid‐base reactions are also found for complexes between enolates and amines; for the crystal structure of the lithium (Z)‐enolate of N,N‐dimethylpropionamide, which exists as a dimer and crystallizes with two molecules of N,N,N′‐trimethylethylenediamine see, and ref. [2a]
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(1985)
Helvetica Chimica Acta
, vol.68
, pp. 1373-1393
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Laube, T.1
Dunitz, J.D.2
Seebach, D.3
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28
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84989589188
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o) were considered as observed. Solution using direct methods (SHELXTL PLUS), refined (SHELXTL PLUS) to R = 0.0629, Rw = 0.0763. Non‐hydrogen atoms anisotropic, H atoms at calculated positions and refined in groups with common temperature factors; 292 parameters. All calculations were carried out on a Microvax II and a VAX 6000–420[11–13]. Further details of the crystal structure investigation may be obtained from the Fachinformationszentrum Karlsruhe, Gesellschaft für wissenschaftlich‐technische Information mbH, D‐76344 Eggenstein‐Leopoldshafen (FRG) on quoting the depository number CSD‐400062, the names of the authors, and the journal citation.
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29
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84989557821
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SHELXTL‐PLUS (VMS), Release 4.2, Siemens Analytical Instruments, Madison, 1991.
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30
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84989500283
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Program for Geometrical Analysis of Crystal Structures, Utrecht
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(1988)
PLATON 88
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Spek, A.L.1
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31
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84989589184
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A FORTRAN Program for the Graphic Representation of Molecular and Crystallographic Models, Freiburg
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(1988)
SCHAKAL‐88B
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Kelley, E.1
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37
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84989572378
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* level. The zero‐point vibration energy was scaled with a factor of 0.9 and is contained in the calculated energies. The program package Gaussian 90 was used
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38
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84902829540
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Gaussian Inc., Pittsburgh
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(1990)
Gaussian 90
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Frisch, M.J.1
Head‐Gordon, M.2
Trucks, G.W.3
Foreman, J.B.4
Schlegel, H.B.5
Raghavachari, K.6
Robb, M.A.7
Binkley, J.S.8
Gonzalez, C.9
DeFrees, D.J.10
Fox, D.J.11
Whiteside, R.A.12
Seeger, R.13
Melius, C.F.14
Baker, J.15
Martin, R.16
Kahn, L.R.17
Stewart, J.J.P.18
Topiol, S.19
Pople, J.A.20
more..
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41
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84891332972
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2O, which is orders of magnitude more acidic than the cyanide, is a further lucid example of the importance of the proximity effect in intramolecular (organic) and enzymatic reactions, see for example, W. A. Benjamin Inc., New York
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(1966)
Bioorganic Mechanisms
, vol.1
, pp. 119-211
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Bruise, T.C.1
Benkovic, S.J.2
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