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Beilstein J. Org. Chem. 2015, 11, 1656–1666, doi:10.3762/bjoc.11.182
Graphical Abstract
Figure 1: Sterically demanding benzannulated NHCs bearing mesityl rings. From the left side:, 4,9-dihydro-4,9...
Figure 2: Benzannulated NHCs of this work. Benzannulated imidazolium chloride salts 1-Cl, 2-Cl, 3-Cl and 4-Cl...
Scheme 1: Synthesis of the N1,N2-diaryl-1,2-benzenediamines 5, 6, 7 and 8. i) Pd(dba)2, P(t-Bu)3, t-BuONa, to...
Scheme 2: Previous synthesis of the benzannulated NHCs 3-Cl and 4-BF4. Ring closure. i) (EtO)3CH, HCl (conc.)...
Scheme 3: Proposed ring-closure mechanism for 1-Cl, 2-Cl, 3-Cl and 4-Cl.
Figure 3: Molecular structure of 2-Cl. The solvate molecule, the counterion and the hydrogen atoms are omitte...