The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article，once mentioned of 14098-44-3, name: Benzo-15-crown-5
Three complexes of benzo-15-crown-5 (B15C5) with protonated primary amines [PhCH2NH3(B15C5)](ClO4), [p-C6H 4(CH2NH3)2(B15C5) 2](ClO4)2, and [(CH2) 4(NH3)2(B15C5)2](SCN)2 were isolated and studied in acetonitrile solutions by NMR, and in the solid state by X-ray crystallography. In all complexes, one B15C5 molecule was bound with each R-NH3+ moiety with characteristic small separation of 1.84-1.86A between the nitrogen of the R-NH3 + group and the O5 mean plane of the crown residue. No sandwich-type complexes with a 1:2 R-NH3+/B15C5 stoichiometry were observed. Binding affinities of B15C5 in acetonitrile were similar for all ammonium cations studied: K1=550±10 M -1 for [PhCH2NH3]+; K 1=1100±100 and K2=400±30 M-1 for [p-C6H4(CH2NH3)2] 2+; and K1=1100±100 and K2=300±30 M-1 for [H3N(CH2)4NH 3]2+. The complexation is primarily enthalpy-driven (DeltaH=-4.9±0.5kcal/mol, DeltaS=-3.8±1.0eu for PhCH2NH3+-B15C5), as determined by variable temperature 1H NMR titrations.
Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.name: Benzo-15-crown-5, you can also check out more blogs about14098-44-3