Reactions of 4-oxoalkanoic acids. III. Synthesis of 5-Methyl- and 5-Methylenepyrrolidin-2-ones by reaction of α-angelica lactone with methylamine
Wedler,C. et al.; J. Prakt. Chem. 332, 4, 557-562 (1990).
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http://dx.doi.org/10.1002/prac.19903320422