Dehydrocostus lactone can be also called as Dehydrocostus lactone or Epiligulyl oxide.
Information of Dehydrocostus lactone:
Mol. Formula: C15H18O2
Mol. Weight: 230.302
CAS No.: 477-43-0
Appearance of Dehydrocostus lactone: white powder
Melting Point: 60.5oC
Botanical Source: Constit. of Saussurea lappa, Veronica hirsuta and Zaluzania tribolia
Purity: > 98% by HPLC
The most stable structure for lactones are the 5-membered γ-lactones and 6-membered δ-lactones because, as in all organic cycles, 5 and 6 membered rings minimize the strain of bond angles. γ-lactones are so stable that, in the presence of dilute acids at room temperature, 4-hydroxy acids (R-CH(OH)-(CH2)2-COOH) immediately undergo spontaneous esterification and cyclisation to the lactone. β-lactones do exist, but can only be made by special methods. α-lactones can be detected as transient species in mass spectrometry experiments.
The reactions of lactones are similar to those of esters, as exemplified by gamma-lactone in the following sections:
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