The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 2,6-Dimethyl-3,5-heptanedione( cas:18362-64-6 ) is researched.Related Products of 18362-64-6.Siddall, Thomas H. III; Stewart, William Esley; Karraker, D. G. published the article 《Evidence for pseudocontact NMR shifts in U(IV) compounds》 about this compound( cas:18362-64-6 ) in Chemical Physics Letters. Keywords: PMR U 4 compound; uranium 4 compound PMR; diketone U 4 PMR. Let’s learn more about this compound (cas:18362-64-6).
1H N.M.R. spectra were recorded of paramagnetic U[RC(:O)CHC(:O)R]4 and diamagnetic Th-[RC(:O)CHC(:O)R] in 10:1 CdCl3, CFCl3 (R = Me, Et, iso-Pr, and tert-Bu). Large paramagnetic shifts were observed over a wide range of temperatures (-39° to 55°): at 30°, paramagnetic shifts were -7.3 to -6.6 ppm. for the methide proton, +3.12 to +4.05 ppm. for the Me protons, and +0.28 to +4.53 ppm. for the CH2 protons (+ indicates upfield relative to Me4Si). Large solvent effects were also observed (solvents CDCl3 and CFCl3). Contrary to statements by R. von Ammon, et al. (1968), both theory and experiment indicate that the pseudocontact effect must significantly affect N.M.R. spectra of U(IV) compounds
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Reference:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica