Name: 2-(2-Bromoethoxy)tetrahydro-2H-pyran. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 2-(2-Bromoethoxy)tetrahydro-2H-pyran, is researched, Molecular C7H13BrO2, CAS is 17739-45-6, about Cation-Controlled Formation and Interconversion of the fac/fac and mer/mer Stereoisomers of a Triple-Stranded Helicate. Author is Chen, Xiaofei; Mevissen, Christian; Huda, Saskia; Goeb, Christian; Oppel, Iris M.; Albrecht, Markus.
Two biscatecholester ligands with oligoether spacers were used to prepare dinuclear titanium(IV) triscatecholate based helicates. In the case of Li4[(1/2)3Ti2], classical helicates with three internally bound Li+ ions and syn-oriented ligands in the complex units (fac/fac isomer) were obtained. In the case of the sodium salt Na4[(2)3Ti2], a different homochiral dinuclear triple-stranded helicate with two internally bound Na+ ions was formed. The complex units are anti-configured, and two of the ligand spacers are connecting internal with external positions of the helicate (mer/mer isomer). Removal of the sodium ions and addition of lithium ions leads to the switching from one topol. to the other with an expanded helicate [(2)3Ti2]4- as an intermediate. Switching back to the nonclassical helicate cannot be observed because severe structural rearrangements would be required.
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Pyridazine – Wikipedia,
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