Dienes, condensation with phenolic compounds

Dienes also condense with phenolic compounds, but the product is usually a chroman. Isoprene 91 condenses with phenol to yield 2,2-dimethylchroman LXXVI, and phytadiene 92 Condenses with trimethyl-... 

Hexafluoroacetone is a reactive electrophile. It reacts with activated aromatic compounds (e.g., phenol), and can be condensed with olefins, dienes, ketenes, and acetylenes. It forms adducts with many compounds containing active hydrogen (e.g., H.,0 or HCN). Reduction of HFA with NaBH or LiAlH affords the useful solvent hexafluoroisopropyl alcohol. The Industrial importance of HFA arises largely from its use 1n polymers and as an... 

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