The aldol condensation of 6‐alkoxy‐2,2‐dimethylchromanones 1 or 2 with substituted benzaldehydes in the presence of tetramethylorthosilicate and potassium fluoride affords 6‐alkoxy‐3‐benzylidene‐2,2‐dimethylchromanones 5‐10 while other conventional methods were unsuccessful.
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Chambers et al. (1995) studied this question.
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