119291-41-7Relevant articles and documents
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.
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
