Complexes of tris(pentafluorophenyl)boron with nitrogen-containing compounds: Synthesis, reactivity and metallocene activation

Frustrated Lewis Pairs: Metal‐free Hydrogen Activation and More

“…[43] The structure reflects the steric congestion in that the B À N bond length of 1.661(2) , was found to be significantly longer than that in (py)B(C 6 F 5 ) 3 (1.628 (2) ; py = pyridine). [42] The observation of an equilibrium at room temperature suggested that frustrated Lewis pair chemistry may be accessible. Treatment of lutidine/B(C 6 F 5 ) 3 with H 2 (1 atm, 2 h) gave the pyridinium salt 74 (Scheme 26, Figure 20 (top)).…”

“…While pyridines are known to form adducts with B-(C 6 F 5 ) 3 [42] the Stephan group was prompted to study the case of lutidine after considering the early work of Brown et al [4] (see Section 1.) Reaction of 2,6-lutidine and B(C 6 F 5 ) 3 gave rise to broad 1 H and 19 F NMR spectra, suggesting the establishment of an equilibrium between free lutidine/B-(C 6 F 5 ) 3 and the Lewis acid/base product (2,6-Me 2 C 5 H 3 N)B-(C 6 F 5 ) 3 73 [43] (Scheme 26).…”

Frustrierte Lewis‐Paare: metallfreie Wasserstoffaktivierung und mehr

“…[42] Stephan et al befassten sich in Kenntnis der frühen Arbeiten von Brown et al [4] (siehe Abschnitt 1) mit entsprechenden Reaktionen von Lutidin. Bei Umsetzung von 2,6-Lutidin mit B(C 6 F 5 ) 3 [46] Rechnungen von Pµpai et al [47] lassen auf die Generierung eines durch H···F-Wechselwirkungen stabilisierten PhosphinBoran-Begegnungskomplexes schließen.…”

Hydrogen and Amine Activation by a Frustrated Lewis Pair of a Bulky N‐Heterocyclic Carbene and B(C6F5)3

“…[30] The ammonia, aniline, and diphenylamine adducts of B(C 6 F 5 ) 3 [31] are deprotonated by ItBu to generate ionic complexes 3-5, respectively, which is analogous to reaction with dihydrogen (Scheme 3).…”