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Synthetic routes are described which lead to iso‐tetrahydrocannabinols, a new series of structural isomers of the natural Δ1‐tetrahydrocannabinol. In this group of compounds a dihydrobenzopyran ring system is formed by cyclization of one of the phenolic groups of a cannabinoid with the C1 carbon in the terpene moiety of the molecule.
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Gaoni et al. (1968) studied this question.
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