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The reaction of 2‐fluoro‐1,1‐dimethoxy‐3‐methylbut‐2‐ene (3) with phenols in dry pyridine leads to 3‐fluoro‐2,2‐dimethyl‐2H‐chromenes. 3‐Fluoro analogues of the natural insect antijuvenile hormones Precocene I (1a) and II (1b) have been prepared by this method.
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Camps et al. (1980) studied this question.
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