title: Extreme magnetic separation of geminal protons in protonated N,N,N'-trimethyl-1,8-diaminonaphthalene. A puzzle of the fourth methyl group.
abstract: Monoprotonated N,N,N'-trimethyl-1,8-diaminonaphthalene demonstrates fast exchange of H(in) and H(out) protons, in which a counterion (BF4(-) and Br(-) were tested) participates. The process can be frozen below 185 K revealing a tremendous magnetic separation (up to Δδ = 11.6 ppm) of these otherwise equal NH protons with the enzyme-like proton transfer and a ∼7 kcal mol(-1) energetic barrier.
authors.affiliation: Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation.
authors.forename: Valery A
authors.initials: VA
authors.lastname: Ozeryanskii
authors.forename: Alexander F
authors.initials: AF
authors.lastname: Pozharskii
authors.forename: Alexander
authors.initials: A
authors.lastname: Filarowski
authors.forename: Gennady S
authors.initials: GS
authors.lastname: Borodkin