Reference of 5455-94-7, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.5455-94-7, Name is 2,2,5,5-Tetramethyldihydrofuran-3(2H)-one, molecular formula is C8H14O2. In a Article，once mentioned of 5455-94-7
The influence of titanium tetrachloride on the diastereoselectivity of hydride reductions of 1,2-, 1,3-, 1,4- and 1,5-diketones has been studied.The effect is especially pronounced in the case of 1,3-diketones, where the addition of titanium tetrachloride reverses the stereoselectivity.The assumption of a chelate of type 32 or 33 can be confirmed by several observations: beta-hydroxy ketone 7 and beta-benzyloxy ketone 9 show the same dependence on the stereochemical course as diketone 5a.This compound forms complex 34, whose conformation is known by X-ray structure determination.From the solid-state (13)C-NMR spectra of the TiCl4 adducts it can be deduced that 7 forms chelate 42, which is close to the assumed intermediate 32.In the case of phenyl-substituted substrates solid-state (13)C-NMR spectroscopy can also be used to differentiate between real chelates (coordination of TiCl4 at the oxygen atoms of the carbonyl groups) and ? complexes. – Key Words: Asymmetric induction / TiCl4 complexes / Solid-state (13)C-NMR spectra
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem