Bis‐Aminals of Linear Tetraamines: Kinetic and Thermodynamic Aspects of the Condensation Reaction

Abstract

The kinetic and thermodynamic aspects of the condensation reaction of dicarbonyl compounds with linear tetraamines were examined in the light of identification of intermediates and DFT calculations.

Microwave-assisted synthesis and characterization of novel metal-free and metallophthalocyanines containing four 14-membered tetraaza macrocycles

“…The structures of novel compounds were characterized by a combination of 1 H NMR, 13 C NMR, IR, UV-vis, elemental analysis and MS spectral data. 3,3 0 -Piperazine-1,4-diyldipropan-1-amine 1 [25], 1,2-dichloro-4,5-dicyanobenzene 4 [26] were prepared according to the literatures (Fig. 1).…”

“…3,3 0 -Piperazine-1,4-diyldipropan-1-amine 1 [25], 1,2-dichloro-4,5-dicyanobenzene 4 [26] were prepared according to the literatures. All reagents and solvents were of reagent grade quality and were obtained from commercial suppliers.…”

Versatile transamination in quinonediimine chemistry: Towards a novel class of water soluble UV/violet chromophores

“…The 1 H NMR spectrum (Figure 1) has been recorded in the presence of two inequivalent protons at δ 6.63 and 6.75, corresponding to hydrogen born by the aromatic ring (positions 6 and 7). On the other hand, three broad singlets at δ 5.09, 5.32 and 7.65 are attributed to NH 2 and NH protons (positions 8, 9 and 2.25 and 4.16 correspond to the bridging propyl and ethyl moieties (positions 1 signal integration corresponding to two protons.A tentative mechanism of formation of compound 2 is proposed in aminals from glyoxal and polyamines [22,23]. Next, to assess the reactivity of the amine functions in compound 2, it was further condensed to p quinoxalinium derivative 3 with 90% yield (Scheme 4).…”

Synthesis and Characterization of Ligands and their Gadolinium(III) Complexes

“…Therefore, an isomerization of the aminals derived from open-chain amines was carefully investigated [149][150][151][152]. An additional key reaction is deprotection.…”