Abstract
The reaction of 2, 6-dimethylthiapyrone with compounds containing active methyl or methylene groups is investigated. Position 4 in the thiapyrone ring is found to react. If the components with active methylene groups are malonodinitrile or cyclic diketomethylene compounds, the methylene groups in the resultant 2, 6-dimethylthiapyrane compounds are still reactive towards electrophilic reagents, a property which is utilized for synthesis of nonionic polymethylene dyes containing thiapyrane rings.
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