Abstract
Starting with well known β-diketoesters the corresponding y-enolethers are synthesized and described. Both classes of compounds inhibited the growth of some microorganisms. The inhibition is abolishable by addition of certain amino acids to the definite medium. A possible mechanism of inhibition is discussed and compared with the mechanism of some β,γ-unsaturated α-amino acids. The known unsaturated a-amino acids, their origin and their biological activity are summarized in two tables.

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