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Abstract
6-tert-Butyl-4-methyl- and 6,8-di-tert-butyl-4-methylcoumarin were prepared from tert-butylphenols and diketene via the corresponding aryl acetoacetates. 6-tert-Butyl-4-methyl-thiocoumarin ( 6 ) was obtained from 6-tert-butylthiophenol. Thionation with Lawesson's or Davy's reagent led to the related thion- and dithiocoumarins. The structures were proved by NMR spectroscopy and an X-ray structure analysis of 6.
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