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40
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84985533138
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Recent reviews:, synthesis, 1162–1176, and references therein.
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(1993)
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Dondoni, A.1
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44
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84985630435
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2 + 2.0401 P] with P = ( F o2 + 2 F c2)/3, all non‐hydrogen atoms anisotropic, hydrogens (except those of the heterocyclic ring) at calculated positions with fixed isotropic temperature factors. The conventional R value R1 was 0.0598 for 3117 reflections with I > 2σ( I). All calculations have been performed on a Micro‐VAX II and a DEC AXP 3000–300 [11, 12]. Further details of the crystal structure determination may be obtained from the Fachinformationszentrum Karlsruhe, D‐76344 Eggenstein‐Leopoldshafen (Germany) on quoting the depository number CSD‐380063.
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45
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84985572189
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(a) SHELXTL‐PLUS (VMS), Vers. 4.21, Siemens Analytical X‐Ray Instruments Inc., Madison, WI, 1990.
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46
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84985526415
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SHELXL‐93, Program for the Refinement of Crystal Structures, Göttingen, 1993.
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Sheldrick, G.M.1
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47
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84985528394
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PLATON 94, Program for Geometrical Analysis of Crystal Structures, Utrecht, 1994.
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Spek, A.L.1
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48
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84985526405
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SCHAKAL‐88B, A FORTRAN Program for the Graphic Representation of Molecular and Crystallographic Models, Freiburg, 1988.
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Keller, E.1
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50
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0000142057
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(1994)
J. Am. Chem. Soc.
, vol.116
, pp. 6641-6649
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Arduengo, A.J.1
Bock, H.2
Chen, H.3
Denk, M.4
Dixon, D.A.5
Green, J.C.6
Herrmann, W.A.7
Jones, N.L.8
Wagner, M.9
West, R.J.10
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57
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0001123214
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Zur Struktur der Lithiumverbindungen von Sulfonen, Sulfoximiden, Sulfoxiden, Thioethern und 1,3-Dithianen, Nitrilen, Nitroverbindungen und Hydrazonen
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CLi distances greater than 250 pm are generally not considered to be bonds
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(1989)
Angewandte Chemie
, vol.101
, pp. 286-306
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Boche, G.1
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59
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84985503368
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Also N1–C3(N2–C10) is increased by 2.2(2.0) pm. S1–C2(S2–C9) remains essentially the same (± 0.5 pm), while C2–C3(C9–C10) is somewhat shortened (2.51.9) pm.
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65
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3142640259
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(a) The enormous importance of the analogous thiazol carbenes (general structure: Li in 7 is exchanged by a substituent R) in biochemical and other processes can only be mentioned here. see, for example
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(1958)
J. Am. Chem. Soc.
, vol.80
, pp. 3719-3726
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Breslow, R.1
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82
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84985526307
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personal communication, July 11, 1994. We thank A. J. Arduengo III for the data of 10.
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Arduengo, A.J.1
Tamm, M.2
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83
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84985526311
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+ as Lewis acid. For example, the N‐C‐S angle in lithiothiazolé (most stable singlet) is calculated to be 107.9°, while 108.6° results for a lithiothiazole · LiOH complex. For comparison: the calculated angle for the thiazole 8 is 115.4°.
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84
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66349103739
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α-Oxygen-Substituted Organolithium Compounds and Their Carbenoid Nature: Calculations of the Configurational Stability and of LiCH2OH Model Structures, Crystal Structure of Diphenyl(trimethylsilyloxy)methyllithium · 3 THF, and the Stereochemistry of the (Reverse) Brook Rearrangement
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2 and 10 now experimentally verify the fourth (high‐energy) model structure
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(1992)
Chemische Berichte
, vol.125
, pp. 2265-2273
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Boche, G.1
Opel, A.2
Marsch, M.3
Harms, K.4
Haller, F.5
Lohrenz, J.C.W.6
Thümmler, C.7
Koch, W.8
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