2014
DOI: 10.1002/ange.201406564
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Festkörperstruktur eines Li/F‐Carbenoids: Pentafluorethyllithium

Abstract: Lithiumcarbenoide faszinieren Chemiker bereits seit mehreren Jahrzehnten. Der Begriff Carbenoid [1,2] geht zurück auf die bahnbrechenden Arbeiten von Simmons und Smith.[3] Er deutet auf ihre Reaktivität als Carbensynthone [4] hin, die in ihrer Struktur mit geminalem Metall-und elektronegativem Nichtmetall-Atom (O, N, Hal) begründet liegt. Ihre hohe Reaktivität und ihr gleichzeitig nucleophiles wie elektrophiles -also ambiphiles -Reaktionsverhalten begründet ihren synthetischen Wert in der C-C-und C-Heteroatom-… Show more

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Cited by 33 publications
(6 citation statements)
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“…Nevertheless, the Li−Br distances of 3.630(8) and 3.704(10) Å are rather large and in the range of the sum of the van der Waals radii . Hence, only a weak lithium−halogen interaction can be present in 2‐Li , particularly in comparison with Li/F carbenoids, which usually form strong Li−F contacts in the solid state . Looking at the NMR spectroscopic data—especially the 1 J PC coupling constant—we assume that the Li−Br interaction in 2‐Li is not present in solution and solely a solid‐state or packing effect in the crystal.…”
Section: Resultsmentioning
confidence: 99%
“…Nevertheless, the Li−Br distances of 3.630(8) and 3.704(10) Å are rather large and in the range of the sum of the van der Waals radii . Hence, only a weak lithium−halogen interaction can be present in 2‐Li , particularly in comparison with Li/F carbenoids, which usually form strong Li−F contacts in the solid state . Looking at the NMR spectroscopic data—especially the 1 J PC coupling constant—we assume that the Li−Br interaction in 2‐Li is not present in solution and solely a solid‐state or packing effect in the crystal.…”
Section: Resultsmentioning
confidence: 99%
“…[H 14 O 6 ][In(C 2 F 5 ) 4 ] 2 crystallizes in the monoclinic space group P2 1 /n with 2 formula units per unit cell (Figure 7). So far, only a few structurally characterized oxonium 14), O1À H1aÀ O2 167.9(13), O1À H1cÀ O2 1 161.8 (14). Symmetry codes 1: À X,1-Y,1-Z; 2: -1/2 + X,3/2-Y,1/2 + Z.…”
Section: Chemistry-a European Journalmentioning
confidence: 99%
“…On the other hand, pentafluoroethyllithium is stable at À 80 °C and can be generated in situ from pentafluoroethane and n-butyllithium. [14] Recently, we reported the synthesis and characterization of related tetrakis-and tris(pentafluoroethyl)gallium compounds. Treatment of gallium(III) chloride or [GaCl 3 (dmap)] (dmap = 4-(dimethylamino)pyridine) with in situ generated pentafluoroethyllithium results in tris(pentafluoroethyl)chlorogallate, [Ga-(C 2 F 5 ) 3 Cl] À , and tetrakis(pentafluoroethyl)gallate, [Ga(C 2 F 5 ) 4 ] À , respectively.…”
Section: Introductionmentioning
confidence: 99%
“…[25][26][27][28][29] The strengthening of this F2C core of the Li(CF2CF3)·2Et2O dimer in the crystal. [32] It is worth noting that the structures of both the transition state and the transient species referred to in the mechanism just discussed, find support in the chemistry of lithium carbenoids. [31] Thus, the bridging role of the F-C unit was substantiated in the crystal structure of the Li(CF2CF3)·2Et2O dimer (Scheme 4d), [32] while a Li(η 2 -F-CF2) interaction was found to be the global minimum for LiCF3 in the gas phase (Scheme 4c).…”
Section: Geometry Optimizations Of the Triatomic [F-au-x]mentioning
confidence: 99%
“…[32] It is worth noting that the structures of both the transition state and the transient species referred to in the mechanism just discussed, find support in the chemistry of lithium carbenoids. [31] Thus, the bridging role of the F-C unit was substantiated in the crystal structure of the Li(CF2CF3)·2Et2O dimer (Scheme 4d), [32] while a Li(η 2 -F-CF2) interaction was found to be the global minimum for LiCF3 in the gas phase (Scheme 4c). [33] Both perfluoroalkyl lithium systems are known to release the corresponding fluorinated carbene upon LiF elimination in a sometimes violent process.…”
Section: Geometry Optimizations Of the Triatomic [F-au-x]mentioning
confidence: 99%