All articles of this category o -Triisopropylsiloxyaryl ketones and aldehydes smoothly reacted with the lithium salt of trimethylsilyldiazomethane to give o -triisopropylsiloxyphenylacetylenes which were easily converted to benzofurans by treatment with tetra-n-butylammonium fluoride. 3-Benzofuranmethanols were also obtained when the reaction was conducted in the presence of carbonyl compounds. trimethylsilyldiazomethane - alkylidene carbene - o -siloxyphenylacetylene - benzofuran
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Ito et al. (1997) studied this question.