Enantiomers of 3-phenylbutyric acid have been converted into 3,4-dihydro-4-methylcoumarin. (+)-(R)-3,4-dihydro-4-methylcoumarin has [α]D20+35°(c 1 in benzene).
J. Grimshaw and P. G. Millar, J. Chem. Soc. C, 1970, 2324 DOI: 10.1039/J39700002324
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