Treatment of (±) 3-ethylphthalides 2 or 2-(prop-1-enyl)benzoic acids 5 with AlCl3 in methylene chloride gives naturally occuring (±) 8-hydroxy-3-methyl-3,4-dihydroisocoumarins 3 in high yields.
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MALI et al. (1992) studied this question.
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