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Beilstein J. Org. Chem. 2021, 17, 319–324, doi:10.3762/bjoc.17.29
Graphical Abstract
Figure 1: Biologically active di- and tetrahydropyridazines.
Scheme 1: Recyclization of hydroxypyrrolines with hydrazine derivatives.
Scheme 2: Synthesis of tetrahydropyridazines 3.
Scheme 3: Synthesis of dihydropyridazines 4.
Scheme 4: Recyclization of hydroxypyrroline 1a with hydrazides 2d and 2e.
Scheme 5: A proposed mechanism for the recyclization of hydroxypyrrolines 1 with hydrazides 2.
Beilstein J. Org. Chem. 2015, 11, 1985–1990, doi:10.3762/bjoc.11.214
Scheme 1: Non-catalyzed addition of P–H species to alkenes.
Figure 1: ORTEP drawing (30% thermal ellipsoid) of phosphine oxide 3d. A CIF file with the crystallographic d...
Scheme 2: Addition of secondary phosphine sulfide to vinyl sulfide under aerobic catalyst-free conditions.
Scheme 3: Putative mechanism.
Beilstein J. Org. Chem. 2011, 7, 46–52, doi:10.3762/bjoc.7.8
Figure 1: (a) Receptor 1. (b) ORTEP drawing of receptor 1. Thermal ellipsoids are drawn at the 30% probabilit...
Figure 2: The absorption spectra of receptor 1 (5 μM) in the absence or presence of a 50 equiv of F−, Cl−, Br−...
Figure 3: The fluorescence spectra of receptor 1 (5 μM) in the absence or presence of a 50 equiv of F−, Cl−, ...
Figure 4: Comparison of fluorescence emission of 1 (5 μM) in CH3CN after the addition of 50 equiv of tetrabut...
Figure 5: UV–vis absorption changes of 1 (5 μM) upon the addition of TBAF in CH3CN.
Figure 6: Fluorescence emission changes of 1 (5 μM) upon the addition of TBAF in CH3CN (excited at 340 nm).
Figure 7: The fit of the experimental data of fluorescence emission of 1 (5 μM) upon the addition of F− at 40...
Figure 8: Fluorescence emission changes of 1 (5 μM) upon the addition of F− and OH− (5 equiv) in CH3CN (excit...
Figure 9: Partial 1H NMR (400 MHz) spectra of receptor 1 in the presence of 0, 0.2, 0.6, 1.0, 1.4, 1.6, 2.0, ...
Figure 10: Anionic form a and b of receptor 1.