The PMR spectra of substituted alkoxy-β-ketoesters
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The physical constants of six new alkoxy-β-ketoesters of the type of (I) with phenyl-, nitrophenyl-, and methylacetylene substituents, were synthesized and determined, and three of them were separated into individual diastereomers.
The PMR spectra of 10 alkoxy-β-ketoesters were studied. An anomalously large number of absorption lines for the methylene protons of the ethoxy group in acetylene compounds and for the methylene protons of the carbethoxy group in phenyl compounds was detected. It was established that in the first case this is due to the nonequivalence of the indicated protons, while in the second it is due to the nonequivalence of the molecules of the diastereomers.
KeywordsMethylene Phenyl Acetylene Absorption Line Nitrophenyl
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