Open AccessLithium aluminum hydride reduction of 1-phenylbutane-1,3-dione, and acetylation of the products: NMR and GC-MS analysis
Author(s) -
Milena Zivkovic-Stosic,
Niko S. Radulović
Publication year - 2021
Publication title -
facta universitatis. series: physics, chemistry and technology
Language(s) - English
Resource type - Journals
eISSN - 2406-0879
pISSN - 0354-4656
DOI - 10.2298/fupct2101031z
Subject(s) - chemistry , aluminum hydride , lithium (medication) , hydride , proton nmr , acetylation , medicinal chemistry , carbon 13 nmr , organic chemistry , ion , metal , medicine , biochemistry , gene , endocrinology , methoxide
Reduction of ?-diketones with lithium aluminum hydride (LiAlH4, LAH) can lead to different products, depending on the tautomeric equilibrium: the reduction of diketo forms gives the corresponding diols and the reduction of ketoenol forms yields elimination products, saturated and unsaturated ketones and alcohols. Here, we report on the results of LAH reduction of 1-phenylbutane-1,3-dione. The products of reduction were further acetylated and separated by dry flash chromatography. The obtained products, phenylbut(en)ols, phenylbut(en)ones and phenylbut(en)yl acetates, were characterized by spectral (1H and 13C NMR, MS) and retention index (RI) data. It can be concluded that LAH preferentially reduces the carbonyl group more distant from the phenyl group of 1-phenylbutane-1,3-dione. The structure-retention index relationships between isomers were discussed. Proton splitting patterns were resolved by proton NMR simulations.