Liu et al., “The conversion of racemic terminal opoxides in to either (+) or (−) —doil γ-and δ-lactones”, Perkin 1, 2000, vol. 20, pp. 3519-3521, XP001025983. |
Tanaka et al., “A simple and practical procedure for the conversion of (S)-4-hydroxymethyl-4-butanolide-4-butanolide into its (R)-enantiomer”, Heterocycles, vol. 23, No. 9, 1985, pp. 2347-2350, XP001018770. |
Takeichi et al., “”Asymmetric selective polymerzation of -butyrolactone catalyzed by optically active cobalt complex/triethylaluminum system, Polymer Journal, vol. 20, No. 2, 1988, pp. 159-162, XP000000303. |
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English language abstract of GR above. |
English language abstract of HR above. |