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- W2099237657 abstract "3-(Phenylsulfonyl)benzo[a]heptalene-2,4-diols 1 can be desulfonylated with an excess of LiAlH4/MeLi⋅LiBr in boiling THF in good yields (Scheme 6). When the reaction is run with LiAlH4/MeLi, mainly the 3,3′-disulfides 6 of the corresponding 2,4-dihydroxybenzo[a]heptalene-3-thiols are formed after workup (Scheme 7). However, the best yields of desulfonylated products are obtained when the 2,4-dimethoxy-substituted benzo[a]heptalenes 2 are reduced with an excess of LiAlH4/TiCl4 at −78→20° in THF (Scheme 10). Attempts to substitute the PhSO2 group of 2 with freshly prepared MeONa in boiling THF led to a highly selective ether cleavage of the 4-MeO group, rather than to desulfonylation (Scheme 13)." @default.
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- W2099237657 date "2005-05-01" @default.
- W2099237657 modified "2023-10-09" @default.
- W2099237657 title "Reductive Elimination of Phenylsulfonyl Groups in the 3-Position of Benzo[a]heptalene-2,4-diols" @default.
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- W2099237657 doi "https://doi.org/10.1002/hlca.200590080" @default.
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