Synthesis of 1‐p‐methoxyphenyl‐2‐methyl‐3‐ethyl‐6‐methoxy‐hydrindene: magnified image of β‐ethyl‐p‐methoxycinnamic acid: magnified image and of 2‐methyl‐3‐p‐methoxyphenyl‐5‐methoxyindenone: magnified image
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Zanden et al. (1949) studied this question.