SDS of cas: 18362-64-6. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 2,6-Dimethyl-3,5-heptanedione, is researched, Molecular C9H16O2, CAS is 18362-64-6, about Direct measurement of enantiomerization of labile aluminum(III) β-diketonates. Author is Springer, Charles S. Jr.; Jurado, Berardo.
Dynamic NMR studies of the hexaccordinate Al complexes, tris-(2,6-dimethylheptane-3,5-dionato)aluminum(III) (AlL3) and bis(pentane-2,4-dionato)(2,6-dimethylheptane-3,5-dionato)-aluminum(III) (AlL2’L), indicate rapid enantiomerization of these complexes. In all solvents studied at room temperature, the spin-coupled doublet of the iso-Pr group of the free ligand LH appeared as a quartet in AlL3. Splitting of the doublet is due to total mol. dissymmetry centered at the Al. On heating, the quartet coalesced to a doublet (120° in chlorobenzene). Activation energy of enantiomerization 14.7 kcal/mole and free energy of activation at the coalescence temperature 21.8 kcal/mole were unchanged on reducing concentration of AlL3. The reaction is unimol. In AlL’2L, enantiomerization occurs simultaneously with L’-methyl exchange; activation energy of enantiomerization is lower than that of Me exchange (∼18 kcal/mole) by a factor of 2.
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Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica