119291-41-7Relevant academic research and scientific papers
Synthesis and structure of tritylium salts
Hinz, Alexander,Labbow, René,Rei?, Fabian,Schulz, Axel,Sievert, Katharina,Villinger, Alexander
, p. 1641 - 1650 (2015/10/28)
Several tritylium compounds [Ph3C][A] have been isolated by salt metathesis or halide abstraction reactions starting from Ph3C-X (X = halogen) and Lewis acids in good yields (A = BF4, BCl4, AlCl4, GaCl4, PF6, AsF6, SbF6, SbCl6, CHB11H5Cl6, CHB11Cl11, CHB11H5Br6, CF3COO, CF3SO3, N3). The structures of 15 tritylium salts bearing different types of weakly coordinating anions (A-) have been determined. The structures are discussed on the basis of ion pairing versus covalent bond formation and solid-state interactions in comparison with gas-phase data.
Trityl Ion Formation by Specific Solvation - A NMR and Conductivity Study in CH2Cl2/CF3COOH
Brandner, G.,Dickert, F.,Fackler, H.
, p. 65 - 74 (2007/10/02)
Trityl trifluoroacetate in CH2Cl2 was chosen to test whether strong ion pairing occurs for 1:1 electrolytes in solvents with a low dielectric constant as predicted from electrostatic considerations.If CF3COOH is added to these solutions up to equimolarity this effect, however, can be neglected as NMR and conductivity measurements show.This behaviour cannot be explained by electrostatics but only by specific anion solvation via hydrogen bridges.In this way the ion recombination rate constant is dramatically reduced by nearly six orders of magnitude in comparison to the absence of acid. - Keywords: Kinetics / Ion solvation / Conductivity / Carbenium ions / NMR-Spectroscopy
The Thermodynamic and Kinetic Behaviour of the Four-Coordinate Carbocation (C6H5)3C(DMF)+ - a NMR and Relaxation Study
Blumenstock, H.,Dickert, F. L.,Hammerschmidt, A.
, p. 123 - 132 (2007/10/02)
Trityl ions form an 1:1 adduct with dimethylformamide according to titration curves via the NMR chemical shift.This four-coordinated carbocation ((C6H5)3C(DMF)+) further reacts with the carbenium ion ((C6H5)3C+) in a consecutive step.In dichloromethane the rate constants of formation and dissociation of (C6H5)3C(DMF)+ could be determined by NMR line shape analysis (k12(298K)=1.5E8 M-1s-1; k21(298K)=4.2E7 s-1).From the rate constant of the reaction between the carbocation and the CF3COO- anion (measured with pressure jump experiments) and the formation equilibrium of the carbocation the recombination rate of the carbenium ion with the trifluoroacetate anion is calculated.The very high value of k(298K)=2.5E9 M-1s-1 indicates that CF3COO- in dimethylformamide reacts as a naked anion. - Keywords: Kinetics / NMR spectroscopy / Carbocations
