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- W2000594631 abstract "π-Conjugated (1−4) and partially reduced (5) macrocyclic Schiff bases have been obtained by proton-template condensation of 2,6-diformyl-4-R1-phenol (R1 = Me, t-Bu) with 1,2-diamino-4,5-R2-benzene (R2 = H, Me). The macrocyclic ligands have been characterized by elemental analysis, by IR, 1H NMR, and 13C NMR spectroscopy, and by electron impact mass spectrometry. Also, the X-ray crystal structures of 1 and 2 were solved. The crystals were all grown from formic acid. Crystal 1 is triclinic, space group P−1 with a = 867.1(5), b = 916.3(4), and c = 1087.2(3) pm and α = 69.62(2), β = 87.57(3), and γ = 63.72(4)° for Z = 1. Crystal 2 is monoclinic, space group P21/n with a = 632.0(1), b = 1661.5(3), and c = 1658.0(3) and β = 99.87(3)° for Z = 2. Both of the molecules are planar with centers of symmetry. They are protonated twice while being neutralized by two negatively charged perchlorate ions." @default.
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- W2000594631 date "1999-02-05" @default.
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- W2000594631 title "Proton-Template Synthesis, Structure, and Characterization of a Robson-Type Macrocycle with a Totally π-Conjugated System" @default.
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- W2000594631 doi "https://doi.org/10.1021/jo9809736" @default.
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