抄録
Structures δ-(3-hydroxyphenyl)-γ-valerolactone and δ-(3, 4-dihydroxyphenyl)-γ-valerolactone were assigned respectively to the intermediate metabolites from (+)-catechin, G and H, according to experimental results reported in the preceding two papers. In the present series of work, dl-δ-(3-methoxyphenyl) and dl-δ-(3, 4-dimethoxyphenyl)-γ-valerolactones were synthesized and the infrared absorption spectra measured in carbon tetrachloride resulted to be entirely identical with the corresponding methyl derivatives of G and H. Racemic compounds of G and H were prepared by demethylation of these methyl derivatives.
